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Line: Trace: Horizontal Distance (ft): EB 689



### Figure EB689-GG-1. Inline 877 and Crossline 2271 Showing Conditions Beneath Proposed Wellsite EB689-GG NORTH SOUTH

CROSSLINE 2271 TW O -W AY TR AVEL TIM E (SEC ) PROPOSED WELLSITE EB689-GG TW O -W AY TR AVEL TIM E (SEC) WEST EAST Filename: 122148_fig_EB689-GG-1.cdr

PROPOSED WELLSITE EB689-GG Project No. 1012-2148

INLINE 877 Line: Trace: Horizontal Distance (ft): EB 690

EB 689 SEAFLOOR
HORIZON 10 HORIZON 20

HORIZON 30

HORIZON 40

100ms (~250 ft) Scale 5000 ft

100ms (~250 ft) Scale 5000 ft Peak

Trough RELATIVE AMPLITUDE

EB 645 STUDY AREA

STUDY AREA

SEAFLOOR HORIZON 10 HORIZON 30 HORIZON 40 HORIZON 20

Peak

Trough RELATIVE AMPLITUDE HUMPHRIES BASIN EB 688

EB 601877.02200.0877.02300.030000350001.4001.5001.6001.7001.8001.9002.0002.1002.2002.3002.4002.5002.6002.7002.8002.9003.0003.1003.2003.3003.400Line:Trace:HorizontalDistance (ft):

TWO-WAY TRAVEL TIME (SEC)WATERFLOW ANDGASPOTENTIALShallow Water Flow and Gas PotentialHIGH01 230 = NEGLIGIBLE1 = LOW2 = MODERATE3 = HIGHHORIZON 30-3,881NEGLIGIBLEHorizonLithology/StratigraphyFigure EB689-GG-2. Tophole Prognosis Chart, Proposed Wellsite EB689-GG, East Breaks Block 689Potential DrillingConstraintsFilename: 122148_fig_EB689-GG-2.cdrProject No. 1012-2148WaterFlowGas3-D Seismic Section ThroughProposed Wellsite EB689-GGX = 1,155,272 FT; Y = 9,915,635 FTInline 877 at Crossline 2271WE383HorizonTWT(sec, bml)Depth(ft, bml)Depth(ft, bss)INLINE 877HORIZON 20-4,264 0.1322,505-6,386 0.799EB689ProposedWellsite EB689-GG2,161-6,042 0.697HorizonTWT(sec, bsl)1.5911.7232.3902.288SEAFLOORHORIZON 10HORIZON 40666-4,547 0.227 1.8183,464-7,345 1.074 2.665INTERFACE4,592-8,473 1.384 2.9755,816-9,697 1.709 3.300LIMIT OFINVESTIGATIONFAULT /INTERFACEFAULT /INTERFACE1,417-5,298 0.469 2.060EB690There is a negligible potential for high-density benthiccommunities within 2,000 ft of the proposed location.Negligible potential for shallow water flow and shallow gas.Moderate potential for shallow water flow.Low potential for shallow gas.Moderate potential for shallow water flow and shallow gas.Low potential for shallow water flow and shallow gas.Stratified hemipelagic silts and clays with thin, muddyturbidities.Predominantly clay-rich mass-transport deposits.Interbedded mass-transport and channel deposits.Clay-rich, contains silts and probable thin sand seams.Interbedded slope-fan, turbidite and mass-transportdeposits. Likely contains silts and possible thin sandseams.Clay-rich mass-transport deposits with thin possiblesands and silts.Negligible potential for shallow water flow and shallow gas.Moderate potential for shallow water flow and shallow gas.Low potential for shallow water flow and shallow gas.Predominantly clay-rich turbidites and gravity flowdeposits, with possible thin sand layers or seams.Potential sand-prone turbidite deposits.PeakTroughRELATIVE AMPLITUDELow potential for shallow water flow and shallow gas.Clay-rich mass-transport deposits with thin possiblesands and silts.Moderate potential for shallow water flow and shallow gas.Potential sand-prone turbidite deposits.5,4283,019724-9,309-6,900-4,6051.6070.9480.2463.1982.5391.837FAULTFAULT /INTERFACEFAULT10615 Shadow Wood Drive Suite 200 Houston, Texas 77043 (713) 468-1410 (o) (713) 468-1438 (f) www.gemsinc.com

Geoscience Earth & Marine Services, Inc. ® // 1 FORUM ENERGY TECHNOLOGIES, INC. March 28, 2012 Project No. 0212-2051 Anadarko Petroleum Corporation 1201 Lake Robbins Drive The Woodlands, TX 77380

Attention: Mr. Rick Kincaid



### Site Clearance Letter Proposed Wellsite EB690-FF

Block 690 (OCS G

- 22296) East Breaks Area, Gulf of Mexico

Anadarko Petroleum Corporation, (Ana darko) plans to drill an exploration well in Block 690 of the East Breaks (EB) area, Gulf of Mexico. This letter addr esses specific seafloor and subsurface geologic and stratigraphic conditions to a de pth of approximately 5,425 ft below th e mudline (bml) at the Proposed Wellsite EB690-FF location. The following discussion is based on findings provided within the geohazard reports “Geologic and Stratigraphic Assessment, Bl ock 689 and 690, East Breaks Area, Gulf of Mexico” (GEMS Report No. 0610-1788), “Geologic and Stratigraphic Assessment, Blocks 602 and 645, East Breaks Area, Gulf of Mexico” (GEMS Report No. 0409- 1634), and “Geologic and Stratigraphic Assessment, Block 646 (OCS G-20725), East Break Area, Gulf of Mexico” (GEMS Report No. 0607-1352). The report findings are supplemented with AUV subbottom pr ofiler and side-scan sona r data acquired by C & C Technologies, Inc. in 2011. The AUV data covers much of eastern EB 645 and western EB 646, but only the northern 1,700 ft of blocks EB 689 and 690.
The surface location for Proposed Wellsite EB690-FF is in the northwest corner of Block 690, East Breaks area, Gulf of Mexico. The coordinates for the proposed location are as follows:



### Proposed Wellsite EB690

‐ FF
Spheroid & Datum: Clarke 1866, NAD27 Projection: UTM Zone 15 North, U.S. ft Line Reference Block Calls
EB 690

X: 1,161,353 ft Latitude: 27o 18' 57.24333"N Inline 869 5,033 ft FWL

Y: 9,915,070 ft Longitude: 94o 28' 32.74711"W Crossline 2419 770 ft FNL

Anadarko may drill this well using a moored vessel. An exact anchor pattern for the proposed well location is undetermined at this time. An anchor radius r epresenting a typical maximum length of chain and anchor on bottom is displayed at 12,000 ft from the proposed wellsite. A 1,000 ft buffer zone beyond the limits of the anchor radius is also included, NTL 2009-G40 (MMS, 2010).



### Attachments
The 1:12,000 scale-maps and page-size figures acco mpanying this letter have been extracted from the main report’s original maps and 3-D data volume and centered on the proposed well location.
Map EB690-FF-1: Bathymetry Map Map EB690-FF-2: Seafloor Rendering Map EB690-FF-3: Seafloor Amplitude Rendering Map EB690-FF-4: Geologic Features Map Figure EB690-FF-1: Inline 869 and Crossline 2419 Showing Conditions Beneath Proposed Wellsite EB690-FFProject No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 2 FORUM ENERGY TECHNOLOGIES, INC. Figure EB690-FF-2: Tophole Prognosis Chart, Proposed Wellsite EB690-FF, East Breaks Block 690 Figure EB690-FF-3: Side-Scan Sonar Mosaic Showin g Seafloor Conditions in the Vicinity of Proposed Wellsite EB690-FF Figure EB690-FF-4: Subbottom Profiler Line 7 19 Showing Near-Surface Conditions Beneath Proposed Wellsite FF



### NTL Requirements
The following report complies with the Bureau of Ocean Energy Management (BOEM; formerly the MMS) Notice to Lessees (NTL’s) 2009-G40, 2008-G04, and 2008-G05 (MMS, 2010 and 2008a, b). The proposed wellsite will be required to follow NTL 2008-G06 with respect to pre- and post-spud ROV visual inspection surveys (MMS, 2008c). The Federal lease block EB 690 is not included in the listing of archaeologically significant blocks (BOEM, 2011b); t herefore, survey requirements for archaeological assessments as set forth in NTL 2005-G07 (MMS, 2005) are not necessary. To comply with pre-seabed disturbance mitigation requirements (BOEM, 2011a), Anadarko elected to perfo rm a high-resolution geophysical survey in the area utilizing an autonomous underwater vehicle (A UV). C & C Technologies, Inc. prepared an archaeological assessment using these data (C & C Technologies Inc., 2011).
Power Spectrum. According to NTL 2008-G05 (MMS, 2008b), 3-D seismic reflection data may be used for shallow hazard assessments with approval from the BOEM, Gulf of Mexico Region. A power spectrum analysis was conducted from the 3-D seismic data cube provided by Anadarko to illustrate the data parameters. The power spectrum curve (below) was generated within a 500-ft radius of the intersection of the inline and crossline at the proposed wellsite location.

Power Spectrum Analysis Curv e, EB 690 Proposed Wellsite FF

The 3-D seismic volume used to assess the shallow haz ards for this assessment possesses frequencies of 50 Hz and above. The same volume was used for wellsites previously permitted and drilled in adjacent blocks by Anadarko.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 3 FORUM ENERGY TECHNOLOGIES, INC. 

### Man-Made Features

Anadarko’s Nansen SPAR is the closest platform to the proposed wellsit e. The SPAR is located in the southern portion of EB 602 approximately 3.56 miles north-northeast of the proposed wellsite. The SPAR is the surface location to several wells in the Nansen field and serves as the hub for several infield and export pipelines within and around the Nansen field (BOEM, 2012a). Several existing well locations are located near the proposed wellsite (Maps EB690-FF-1 through FF-4). Existing locations within a 13,000-ft radius around the proposed location include:



### Surface Area / Block Well Name Operator Well Status Distance / Direction from Proposed Surface Location

EB 690 001 Anadarko Petroleum Corporation Completed 4,000 ft/Southsoutheast

EB 646 SS001 Anadarko Petroleum Corporation Completed 4,630 ft/Northwest

EB 646 SS006 Anadarko Petroleum Corporation Plugged and Abandoned 4,658 ft/Northwest

EB 645 001 Maxus (U.S.) Exploration Company Plugged and Abandoned 7,654 ft/Northwest

EB 689 001 Shell Deepwater Development Inc. Plugged and Abandoned 8,700 ft/Southsouthwest

Several pipelines and umbilicals lie near the Propo sed EB690-FF wellsite loca tion (Maps EB690-FF-1 through FF-4). Anadarko’s 4-inch umbilical and 6-inch oil and gas pipelines lie from 1,022 ft to 2,200 ft southwest of the proposed location. The pipelines and umbilical originate from Anadarko’s EB 690 #001 well and trend to the northwest to the Anadarko SS 006/001 well completions in EB 646. The lines then continue northeast through EB 646 to the Nansen SPAR in EB 602. Another umbilical originates from the SPAR and extends back to the sa me well completion in EB 646.
Anadarko’s 3-inch umbilical and 6-inch oil pipeline al so tie-in at the Anadarko SS006/001 well completions in EB 646. These structures originate from the EB 646 SS007/SS008 well completions in the north-central portion of EB 646 and trend to the southwest to the SS006/001 well completions. The EB 646 SS007/SS008 well completions are approximately 13,850 ft to the north of the proposed wellsite and are outside the 13,000 ft radius around the proposed wellsite. However, the southern portions of the pipeline and umbilical extending from these structures will be within this area. The pipeline and umbilical lie 2,783 ft and 3,394 ft northwest of the proposed wellsite, respectively. Williams Field Services’ 12-inch oil and 12-inch gas export pipelines are lo cated 8,350 ft and 8,562 ft, respectively, west of the proposed location in the northwe st portion of EB 690. The pipelines start at a well completion in EB 599 and trend southeast across EB 644 and into EB 689. In EB 689 the pipelines curve to a northeast heading across the eastern portion of EB 645 and northwestern portion of EB 646. The pipelines stay on this north-easte rly heading to the termination point with the Nansen SPAR in EB 602.
The pipelines are visible on the side-scan sonar dat a (Figure EB690-FF-3). Anchor scars extending from previous wellsites and possibly pipeline barges occur along the seafloor near the proposed EB 690-FF wellsite (Figure EB690-FF-3).
Eleven military warning areas are loca ted within the Gulf of Mexico. These areas repres ent regions where the U.S. Department of Defense co nducts various testing an d training operations. Lessees within military warning areas are required to enter into an agreement with the appropriate command headquarters concerning the control of electromagnetic emission s and the use of boats and aircraft within the warning area (NTL 2009-G06, MMS 2009). East Breaks Blo ck 690 is within the active W-602 and W-147E MilitaryProject No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 4 FORUM ENERGY TECHNOLOGIES, INC. Warning Areas. Coordination of fiel d operations with the appropriate commands may be necessary. The command headquarters information is:
Military Warning Area W-602 Strategic Command Wing 1, Fleet Area Rec onnaissance 4; Operations Department Tinker Air Force Base Oklahoma City, Oklahoma 73145-8704 Telephone: (405) 739-5700/4527
Military Warning Area W-147E Air Field Management 14657 Sneider St. Houston, Texas 77034-5586 Telephone: (281) 929-2142



### Wellsite Conditions

The surface location is clear of any constraining geologic conditions within a 2,000 ft radius from the proposed wellsite. Water Depth and Seaf loor Conditions. The water depth at the proposed location is approximately - 4,139 ft (Map EB690-FF-1). The seafloor slopes to the east at about 3  . The proposed location lies on the western side of Humphries Basin and east of the hi ghly faulted region along the rim of the basin (Maps EB690-FF-1 through FF-4). The seafloor at the propos ed site is relatively smooth and featureless. The near-surface sediments are expected to be normally-c onsolidated, soft clays, forming a drape over the

area. Deepwater Benthic Communities. No significant chemosynthetic or other benthic type communities are reported within EB 690 (MMS, 2010). The nearest reco rded community to the proposed wellsite location is in the northwest portion of EB 602, over 5 miles to the northwest. The 3-D seismic data show no indications of hydrocarbon seepage within 2,000 ft of the proposed EB690-FF wellsite location (Figures EB690-FF-1 and FF-2). The Seafloor Amplitude Rende ring (Map EB690-FF-3) shows normal (ambient) background amplitudes at the seafloor around this location. Subbottom profiler and side-scan sonar data covering much of the 2,000 ft radius show no evidence of near-surface gassy sediments, high-backscatter, or other indications of benthic communities near th e proposed location (Figures EB690-FF-3 and FF-4). AUV data was not collected in the southern third of t he 2,000 ft radius (Figure EB690-FF-3). No mounds, depressions, or hard bottom features occur within a 2,000 ft radius around the proposed wellsite. The potential for high-density chemosynthetic and other bent hic communities within 2,000 ft of the proposed location is negligible. Stratigraphy. The stratigraphy at the proposed well locati on is illustrated on Figures EB690-FF-1, FF-2, and FF-4. The subbottom profiler data show approximately 350 ft of well-stratified, hemipelagic, clay-rich, sediments beneath the seafloor at the proposed location (Fi gure EB690-FF-4). The nearly transparent drape of presumably very soft, high water content pelagic clays is approximately 10 ft thick at the proposed location. The soils beneath the drape will gradually increase in strength and decrease in water content with depth. The Tophole Prognosis Chart (Figure EB690-FF-2) shows the inline annotated with calculated depths to the various horizons and predicted lithology of the se quences, along with their potential for shallow water flow and shallow gas. In general, the sediments betwe en the seafloor and the limit of investigation (about 5,425 ft bml) consist of hemipelagic silts and clays, bedded turbidites, slope-fan, and mass-transport deposits. The shallow section, seafloor to Horizon 20 (0 ft to 797 ft bml) will likely consist of predominantly clays and silts. Similar sediments interbedded with thin sand layers are likely in the Horizon 20 to Horizon 30 unit (797 ft to 1,952 ft bml). Sands are possible from Horizon 30 to the limit of investigation (5,425 ft bml). Potentially thick sand layers may occur within turbidites and mass-transport deposits in the upper portion of the Horizon 30 to Horizon 40 sequence between 1,952 ft to 2,766 ft bml. The slope-fan deposits may correspond to the regional slope-fan sequence know n as the GB Orange Unit. Thick sand layers may also be encountered between 3,950 ft and 4,396 ft bml.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 5 FORUM ENERGY TECHNOLOGIES, INC. Faults. No seafloor or buried faults will be penetra ted by the well bore beneath the proposed EB690-FF wellsite between the seafloor and at least 5,425 ft bml, the limit of investigation (Figures EB690-FF-1, FF-2, and FF-4).

Shallow Gas and Sh allow Water Flow. The potential for shallow gas and shallow water flow at this well location varies from negligible to moderate at the proposed wellsite (Figure EB 690-FF-2).

Shallow Gas. A vertical well bore at the proposed well location will not penetrate any high-amplitude anomalies between the seafloor and at least 5,425 ft bml, the limit of investigation; Map EB690-FF-4. The potential for encountering shallow gas at the Proposed We llsite EB690-FF is low to moderate in zones from Horizon 20 (797 ft bml) to the limit of investigat ion (Figure EB690-FF-2). A moderate potential for encountering shallow gas exists in the intervals bet ween 1,952 ft to 2,766 ft bml and 3,950 ft to 4,396 ft bml. The potential for encountering interbedded sand layers near the proposed wellsite is likely in these intervals. A low potential occurs in the intervals between 797 ft to 1,952 ft bml, 2,766 ft to 3,950 ft bml, and 4,396 ft to 5,425 ft bml (limit of investigation). There is a negligible potential for encountering shallow gas in the sequences from the seafloor to Horizon 20 (797 ft bml).

Shallow Water Flow . There is a moderate potential for shallow water flow within three sand-prone units (Figure EB690-FF-2). The shallowest unit is from 797 ft to 1,952 ft bml (Horizon 20 to Horizon 30). This stratigraphic interval likely contains sand-prone, bedded turbidite deposits. Drilling reports indicate the Maxus EB 645 #001 well, approximately 7,654 ft south-s outheast of the proposed wellsite, experienced shallow water flow conditions within this shallow tu rbidite sequence (BOEM, 2012b). Similar stratigraphic conditions can also be correlated to the Anadark o SS007/SS008 wells in the northwestern portion of EB 646, the SS006/001 wells in the southwestern porti on of the block, and the A nadarko #001 in the northcentral portion of EB 690. These wells did not repor t shallow water flow from the shallow sequence (BOEM, 2012b). However, we recommend designing yo ur casing program to take into account the potential for shallow water flow within this interval.
The next stratigraphic interval with a moderate potential for shallow water flow is between 1,952 ft to 2,766 ft and consists of stacked, slope-fan and turbidit e deposits. These deposits may correlate with the regional, slope fan sequence known as the Garden B anks (GB) Orange Unit. A moderate potential for shallow water flow also exists within the sand-prone interval between 3,950 ft and 4,396 ft bml (Figure EB690-FF-2). Although existing wells within and adjacent to EB 690 did not report shallow water flow from similar intervals, continuous sand seams c ould be present, some of which may be overpressured.
The potential for shallow water flow is low from 2,766 ft to 3,950 ft bml and below 4,396 ft to the limit of investigation at 5,425 ft bml. Sands may be present with in these intervals; however, they are not likely to be significantly overpressured. Th e remaining stratigraphic sequences at the proposed wellsite have a negligible potential for encountering shallow water flow.
The potential for shallow water flow is low from 2,161 ft to 2,988 ft bml and below 3,546 ft to the limit of investigation at 5,825 ft bml. Sands may be present with in these intervals; however, they are not likely to be significantly overpressured. Th e remaining stratigraphic sequences at the proposed wellsite have a negligible potential for encountering shallow water flow.



### Anchor Locations
A 13,000-ft radius (12,000 ft maximum anchor spread as required during hurricane season plus a 1,000 ft buffer zone) is outlined on Maps EB690-FF-1 through FF-4 to represent an area that may be impacted by a generic anchoring configuration. The radius is the bas is for clearance of seafloor conditions relating to anchoring considerations. Water depths within the potential 13,000 ft mooring area range from about -3,300 ft to -4,750 ft (Map EB690-FF-1). The northwest portion of the anchor radius is highly-faul ted and irregular. The irregular seafloor conditions in these areas are associated with several seafloor faults that occur within a large, northeast-southwest trending fault system along the west ern flank of Humphries Basin (Map EB690-FF-2). Seafloor mounds are also present. The seafloor ac ross the western, southern, and eastern areas is generally smooth and featureless.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 6 FORUM ENERGY TECHNOLOGIES, INC. Slopes along the various fault escarp ments range from approximately 3° to 46°. Irregular and mounded seafloor downdip of the faults, particularly in the no rth-central portion of the anc hor radius, are likely the result of localized slumping fr om oversteepening along the faults.
The seafloor in the far western porti on of the radius gently dips to the southwest in EB 645 and southeast in the northern portion of EB 689. The seafloor in the sout hern portion dips to the northeast across most of EB 689 and to the east in EB 690 at about 2° to 5°. The northeast dipping seafloor in EB 689 is the result of a topographic high centered in block EB 733 to the south. The seafloor in the eastern portion of the radius dips to the east into Humphries Basin. Av erage gradients within this area range from 2o to 5o.
There is one small seafloor amplitude anomaly observ ed within the probable radius for this wellsite (Map 690-FF-3). This anomaly lies along a fault in EB 646 approximately 2.2 miles north-northwest of the proposed wellsite. AUV side-scan sonar and subbottom pr ofiler data reveal high-backscatter intensity and near-surface acoustic voids near the anomaly. Be nthic communities are possible within these patches; however, significant high-density co mmunities are unlikely. We reco mmend that the anomaly be avoided by at least 500 ft when planning an anchor mooring pa ttern. Four seafloor mounds exist along the downthrown side of two seafloor fault escarpment s along the eastern margin of EB 645, approximately 10,500 ft to 13,000 ft northwest of the proposed wellsite . No elevated amplitude re sponses at the seafloor are associated with these features in the 3D da ta. High-resolution AUV data reveals high-sonar backscatter and near-surface acoustic voids, indicating gassy sediment near these seafloor mounds. We recommend that the mounds be avoided by at least 500 ft when planning an anchor mooring pattern at this location.



### Closing
The Proposed Wellsite FF in East Breaks Block 69 0 appears suitable for exploration drilling operations. However, caution is advised while drilling through potent ially sand-prone intervals identified between 797 ft and 4,396 ft bml. Shallow water flow is more likely to be encountered within these stratigraphic units.
We recommend avoiding the seafloor mounds to the northwest of the proposed wellsite when planning an anchor mooring pattern for this location.
We appreciate the opportunity to be of service to Anadarko Petroleum Corporation and look forward to working closely with you on other projects.

Sincerely,

GEOSCIENCE EARTH & MARINE SERVICES, INC. ®

Lisa A. Majzlik Daniel Lanier Geoscientist Vice President - Geoscience

Attachments: (4 Maps and 4 Figures) Distribution: Mr. Rick Kincaid, Anadarko Petroleum Corporation, The Woodlands, TX (6 copies)

References:
Bureau of Ocean Energy Management (BOEM), 2011 a, Pre-Seabed Disturbance Survey Mitigation <http://www.gomr.boemre.gov/homepg/regulate/environ/archae ological/Conditional-Archaeological-Mitigation.pdf.
BOEM (Bureau of Ocean Energy Management ), 2011b, Notice to lessees and operators (NTL) of federal oil and gas leases and pipeline right-of-way (ROW) holders on the outer cont inental shelf (OCS), Revisions to the list of OCS lease blocks requiring archaeological resource surveys and report s: U. S. Department of the Interior, Bureau of Ocean Energy Management, Bureau of Safety and Environment al Enforcement Gulf of Mexico Region (GOMR), NTL 2011- JOINT-G01. Effective Date December 29, 2011.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 7 FORUM ENERGY TECHNOLOGIES, INC. BOEM (Bureau of Ocean Energy Managem ent), 2012a, ASCII Data Files, publish ed on the BOEMRE Gulf of Mexico Region Homepage: <http://www.gomr.boem.gov/homepg/p ubinfo/freeasci/freedesc.html >, Accessed Jan, 2012.
BOEM (Bureau of Ocean Energy Man agement), 2012b, Safety performance review-Shallow Waterflows Can Pose Significant hazards to deepwater drilling, http://www.gomr/mms.gov/homepg/ offshore/sftey/watrflow.html website accessed Jan, 2012.
C & C Technologies, Inc., 2011, Archaeological Assess ment Report; Nansen, Erik sson, and Mawson Exploration Prospect, Blocks 602 (OCS-G-14205), 645 (OCS-G-32822), and 646 (OCS-G-20725), East Breaks Area, Gulf of Mexico, Project No. 110397.
Geoscience Earth & Marine Services, Inc. ® (GEMS), 2010, Geologic and stratigraphic assessment, blocks 689 and 690, East Breaks Area, Gulf of Mexico, Project No. 0610-1788.
Geoscience Earth & Marine Services, Inc.® (GEMS), 2007, Geologic and stratigraphic assessment, block 646 (OCS G20725), East Breaks Area, Gulf of Mexico, Project No. 0607-1352.
Geoscience Earth & Marine Services, Inc.® (GEMS), 2009, Geologic and stratigraphic assessment, blocks 602 and 645, East Breaks Area, Gulf of Mexico, Project No. 0409-1634.
Minerals Management Service, 2005, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shelf, Gu lf of Mexico OCS region, Archaeological resource surveys and reports: U. S. Department of the Interior, Mineral s Management Service, Gulf of Mexico, NTL 2005-G07.
Minerals Management Service, 2008a, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shel f, Gulf of Mexico OCS region , information re quirements for exploration plans and development oper ations coordination documents: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NTL 2008-G04.
Minerals Management Service, 2008b, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shelf, Gulf of Mexico OCS region, shallow hazards requirements: U. S. Department of the Interior, Minerals Mana gement Service, Gulf of Mexico, NTL 2008-G05.
Minerals Management Service, 2008c, Notice to lessees and o perators of federal oil, gas, and sulphur leases in the outer continental shelf, Gulf of Mexico OCS region; remote ly operated vehicle surveys in deepwater, U. S. Department of the Interior, Minerals Management Se rvice, Gulf of Mexico, NTL 2008-G06.
Minerals Management Service, 2009, Notice to lessees and o perators of federal oil and gas leases and pipeline rightof-way holders on the outer continental shelf, Gulf of Mexico OCS region, Milit ary Warning and Water Test Areas: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NTL 2009-G06. Effective Date April 22, 2009.
Minerals Management Service, 2010, Notice to lessees and operators of federal oil and gas leases in the outer continental shelf, Gulf of Mexico OCS region, deepwater benthic communities: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NT L 2009-G40. Effective Date January 27, 2010.Line: T race: Horizontal Distance (ft):



### Figure EB690-FF-1. Inline 869 and Crossline 2419 Showing Conditions Beneath Proposed W ellsite EB690-FF NOR TH SOUTH

CROSSLINE 2419 T WO-WAY T RAVEL T IME (SEC) PROPOSED WELLSITE EB690-FF T WO-WAY T RAVEL T IME (SEC) WEST EAST Filename: 122051_fig_EB690-FF-1.cdr

PROPOSED WELLSITE EB690-FF Project No. 0212-2051

INLINE 869 Line: T race: Horizontal Distance (ft): EB 690

EB 646 SEAFLOOR HORIZON 10 HORIZON 20

HORIZON 30

HORIZON 40

100ms (~250 ft) Scale 5000 ft

SEAFLOOR

HORIZON 10 HORIZON 20 HORIZON 30 HORIZON 40

100ms (~250 ft) Scale 5000 ft

Peak

T roughRELATIVEAMPLITUDE Peak

T roughRELATIVEAMPLITUDE

EB 690 STUDY AREA STUDY AREA

HUMPHRIES BASINLi ne :

Tra ce: Horizontal Distance (ft):TWO-WAYTRAVELTIME (SEC) W A TER FLOW AND GAS POTENTIAL Shallow W ater Flow and Gas Potential HIGH

0 1 2 3 0 = NEGLIGIBLE 1 = LOW 2 = MODERA

TE 3 = HIGH

HORIZON 30 -4,139 NEGLIGIBLE

Horizon Lithology/Stratigraphy



### Figure EB690-FF-2. T

ophole Prognosis Chart, Proposed W ellsite EB690-FF , East Breaks Block 690 Potential Drilling Constraints Filename: 122051_fig_EB690-FF-2.cdr Project No. 0212-2051

W ater Flow Gas 3-D Seismic Section Through Proposed W ellsite EB690-FF X = 1,161,353 FT; Y

= 9,915,070 FT Inline 869 at Crossline 2419 

## W E

469 Horizon TWT (sec, bml) Depth (ft, bml) Depth (ft, bss)

INLINE 869 HORIZON 20 -4,608 0.161

3,329 -7,468 1.036 Proposed W ellsite EB690-FF

2,766 -6,905 0.875 Horizon TWT (sec, bss)

1.694

1.855

2.730 2.569 SEAFLOOR

HORIZON 10

HORIZON 40 797 -4,936 0.270 1.964

1,952 -6,091 0.634 2.328

3,950 -8,089 1.209 2.903 INTERF ACE

4,396

-8,535 1.331 3.025

5,425 -9,564 1.606 3.300 LIMIT OF INVESTIGA

TION INTERF ACE INTERF ACE EB 690

There is a negligible potential for high-density benthic communities within 2,000 ft of the proposed location.

Negligible potential for shallow water flow and shallow gas.

Moderate potential for shallow water flow

. Low potential for shallow gas.

Low potential for shallow water flow and shallow gas. Moderate potential for shallow water flow and shallow gas.

Low potential for shallow water flow and shallow gas. Stratified hemipelagic silts and clays with thin, muddy turbidities.

Predominantly clay-rich mass-transport deposits.

Interbedded mass-transport and channel deposits. Clay-rich, contains silts and probable thin sand seams.

Interbedded turbidites and mass-transport deposits. Clay-rich, contains silts and possible thin sand seams. Slope-fan turbidite deposits interbedded with clay-rich mass-transport deposits. Potential sand seams likely

. Unit may correlate to regional GB Orange Unit.

Clay-rich mass-transport deposits with thin possible sands and silts. Negligible potential for shallow water flow and shallow gas.

Moderate potential for shallow water flow and shallow gas. Potential sand-prone turbidite deposits.

Peak T rough RELA

TIVE AMPLITUDE Predominantly clay-rich turbidites and gravity flow deposits, with possible thin sand layers or seams. Low potential for shallow water flow

. Negligible potential for shallow gas.10615 Shadow Wood Drive Suite 200 Houston, Texas 77043 (713) 468-1410 (o) (713) 468-1438 (f) www.gemsinc.com

Geoscience Earth & Marine Services, Inc. ® // 1 FORUM ENERGY TECHNOLOGIES, INC. March 28, 2012 Project No. 0212-2051 Anadarko Petroleum Corporation 1201 Lake Robbins Drive The Woodlands, TX 77380

Attention: Mr. Rick Kincaid



### Site Clearance Letter Proposed Wellsite EB690-JJ

Block 690 (OCS G

- 22296) East Breaks Area, Gulf of Mexico

Anadarko Petroleum Corporation, (Ana darko) plans to drill an exploration well in Block 690 of the East Breaks (EB) area, Gulf of Mexico. This letter addr esses specific seafloor and subsurface geologic and stratigraphic conditions to a de pth of approximately 5,717 ft below th e mudline (bml) at the Proposed Wellsite EB690-JJ location. The following discussion is based on findings provided within the geohazard reports “Geologic and Stratigraphic Assessment, Bl ock 689 and 690, East Breaks Area, Gulf of Mexico” (GEMS Report No. 0610-1788), “Geologic and Stratigraphic Assessment, Blocks 602 and 645, East Breaks Area, Gulf of Mexico” (GEMS Report No. 0409- 1634), and “Geologic and Stratigraphic Assessment, Block 646 (OCS G-20725), East Break Area, Gulf of Mexico” (GEMS Report No. 0607-1352). The report findings are supplemented with AUV subbottom pr ofiler and side-scan sona r data acquired by C & C Technologies, Inc. in 2011. The AUV data covers much of eastern EB 645 and western EB 646, but only the northern 1,700 ft of blocks EB 689 and 690.
The surface location for Proposed Wellsite EB690-JJ is in the northwest corner of Block 690, East Breaks area, Gulf of Mexico. The coordinates for the proposed location are as follows:



### Proposed Wellsite EB690

‐ JJ
Spheroid & Datum: Clarke 1866, NAD27 Projection: UTM Zone 15 North, U.S. ft Line Reference Block Calls
EB 690

X: 1,156,904 ft Latitude: 27o 18' 58.85917"N Inline 872 584 ft FWL

Y: 9,915,286 ft Longitude: 94o 29' 22.10101"W Crossline 2311 554ft FNL

Anadarko may drill this well using a moored vessel. An exact anchor pattern for the proposed well location is undetermined at this time. An anchor radius r epresenting a typical maximum length of chain and anchor on bottom is displayed at 12,000 ft from the proposed wellsite. A 1,000 ft buffer zone beyond the limits of the anchor radius is also included, NTL 2009-G40 (MMS, 2010).



### Attachments
The 1:12,000 scale-maps and page-size figures acco mpanying this letter have been extracted from the main report’s original maps and 3-D data volume and centered on the proposed well location.
Map EB690-JJ-1: Bathymetry Map Map EB690-JJ-2: Seafloor Rendering Map EB690-JJ-3: Seafloor Amplitude Rendering Map EB690-JJ-4: Geologic Features Map Figure EB690-JJ-1: Inline 872 and Crossline 2311 Showing Conditions Beneath Proposed Wellsite EB690-JJProject No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 2 FORUM ENERGY TECHNOLOGIES, INC. Figure EB690-JJ-2: Tophole Prognosis Chart, Pr oposed Wellsite EB690-JJ, East Breaks Block 690 Figure EB690-JJ-3: Side-Scan Sonar Mosaic Showing Seafloor Conditions in the Vicinity of Proposed Wellsite EB690-JJ Figure EB690-JJ-4: Subbottom Profiler Line 2 002 Showing Near-Surface Conditions Beneath Proposed Wellsite JJ



### NTL Requirements
The following report complies with the Bureau of Ocean Energy Management (BOEM; formerly the MMS) Notice to Lessees (NTL’s) 2009-G40, 2008-G04, and 2008-G05 (MMS, 2010 and 2008a, b). The proposed wellsite will be required to follow NTL 2008-G06 with respect to pre- and post-spud ROV visual inspection surveys (MMS, 2008c). The Federal lease block EB 690 is not included in the listing of archaeologically significant blocks (BOEM, 2011b); t herefore, survey requirements for archaeological assessments as set forth in NTL 2005-G07 (MMS, 2005) are not necessary. To comply with pre-seabed disturbance mitigation requirements (BOEM, 2011a), Anadarko elected to perfo rm a high-resolution geophysical survey in the area utilizing an autonomous underwater vehicle (A UV). C & C Technologies, Inc. prepared an archaeological assessment using these data (C & C Technologies Inc., 2011).
Power Spectrum. According to NTL 2008-G05 (MMS, 2008b), 3-D seismic reflection data may be used for shallow hazard assessments with approval from the BOEM, Gulf of Mexico Region. A power spectrum analysis was conducted from the 3-D seismic data cube provided by Anadarko to illustrate the data parameters. The power spectrum curve (below) was generated within a 500-ft radius of the intersection of the inline and crossline at the proposed wellsite location.

Power Spectrum Analysis Curve, EB 690, Proposed Wellsite JJ

The 3-D seismic volume used to assess the shallow haz ards for this assessment possesses frequencies of 50 Hz and above. The same volume was used for wellsites previously permitted and drilled in adjacent blocks by Anadarko.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 3 FORUM ENERGY TECHNOLOGIES, INC. 

### Man-Made Features

Anadarko’s Nansen SPAR is the closest platform to the proposed wellsit e. The SPAR is located in the southern portion of EB 602 approximately 3.75 miles north-northeast of the proposed wellsite. The SPAR is the surface location to several wells in the Nansen field and serves as the hub for several infield and export pipelines within and around the Nansen field (BOEM, 2012a). Several existing well locations are located near the proposed wellsite (Maps EB690-JJ-1 th rough JJ-4). Existing locations within a 13,000-ft radius around the proposed location include:



### Surface Area / Block Well Name Operator Well Status Distance / Direction from Proposed Surface Location

EB 646 SS001 Anadarko Petroleum Corporation Completed 2,111 ft/Northnortheast

EB 646 SS006 Anadarko Petroleum Corporation Plugged and Abandoned 2,165 ft/Northnortheast

EB 645 001 Maxus (U.S.) Exploration Company Plugged and Abandoned 3,993 ft/Northwest

EB 689 001 Shell Deepwater Development Inc. Plugged and Abandoned 4,471 ft/Southwest

EB 690 001 Anadarko Petroleum Corporation Completed 7,392 ft/Southeast

Several pipelines and umbilicals lie near the Prop osed EB690-JJ wellsite location (Maps EB690-JJ-1 through JJ-4). Anadarko’s 4-inch umbilical and 6- inch oil and gas pipelines lie from 732 ft to 1995 ft northeast of the proposed location. The pipelines and umbilical originate from Anadarko’s EB 690 #001 well and trend to the northwest to the Anadarko SS 006/001 well completions in EB 646. The lines then continue northeast through EB 646 to the Nansen SPAR in EB 602. Another umbilical originates from the SPAR and extends back to the sa me well completion in EB 646.

An Anadarko 3-inch umbilical and a 6-inch oil pipeline also tie-in at the Anadarko SS006/001 well completions in EB 646. These structures originat e from the EB 646 SS007/SS008 well completions in the north-central portion of EB 646 and trend to the southw est to the SS006/001 well completions. The EB 646 SS007/SS008 well completions are approximately 2.8 mi north-northeast of the proposed wellsite and are outside the 13,000 ft radius around the proposed wellsite. However, the southern portions of the pipeline and umbilical extending from these structures will be within this area. The pipeline and umbilical lie 2,009 ft and 2,209 ft east and northeast of the proposed wellsite, respectively. Williams Field Services’ 12-inch oil and 12-inch gas export pipelines are lo cated 4,170 ft and 4,376 ft, respectively, west-northwest of the proposed location in the northwest portion of EB 690. The pipelines start at a well completion in EB 599 and trend southeast across EB 644 and into EB 689. In EB 689 the pipelines curve to a northeast heading across the eastern portion of EB 645 and northwestern portion of EB 646. The pipelines stay on this north-easterly he ading to the termination point with the Nansen SPAR in EB 602.
The pipelines are visible on the side-scan sonar a nd subbottom profiler data (Figures EB690-JJ-3 and JJ-4). Anchor scars extending from previous wellsites and possibly pipeline barges occur along the seafloor near the proposed EB 690- JJ wellsite (Figure EB690-JJ-3).
Eleven military warning areas are loca ted within the Gulf of Mexico. These areas repres ent regions where the U.S. Department of Defense co nducts various testing an d training operations. Lessees within military warning areas are required to enter into an agreement with the appropriate command headquarters concerning the control of electromagnetic emission s and the use of boats and aircraft within the warningProject No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 4 FORUM ENERGY TECHNOLOGIES, INC. area (NTL 2009-G06, MMS 2009). East Breaks Blo ck 690 is within the active W-602 and W-147E Military Warning Areas. Coordination of fiel d operations with the appropriate commands may be necessary. The command headquarters information is:
Military Warning Area W-602 Strategic Command Wing 1, Fleet Area Rec onnaissance 4; Operations Department Tinker Air Force Base Oklahoma City, Oklahoma 73145-8704 Telephone: (405) 739-5700/4527
Military Warning Area W-147E Air Field Management 14657 Sneider St. Houston, Texas 77034-5586 Telephone: (281) 929-2142



### Wellsite Conditions

The surface location is clear of any constraining geologic conditions within a 2,000 ft radius from the proposed wellsite. Water Depth and Seaf loor Conditions. The water depth at the proposed location is approximately - 3,944 ft (Map EB690-JJ-1). The seafloor slopes to the east at about 2.2  . The proposed location lies on the western side of Humphries Basin and east of the hi ghly faulted region along the rim of the basin (Maps EB690-JJ-1 through JJ-4). The seafloor at the pro posed site is relatively smooth and featureless. The near-surface sediments are expected to be normally-c onsolidated, soft clays, forming a drape over the

area. Deepwater Benthic Communities. No significant chemosynthetic or other benthic type communities are reported within EB 690 (MMS, 2010). The nearest reco rded community to the proposed wellsite location is in the northwest portion of EB 602, over 5 miles to the northwest. The 3-D seismic data show no indications of hydrocarbon seepage within 2,000 ft of the proposed EB690-JJ wellsite location (Figures EB690-JJ-1 and JJ-2). The Seafl oor Amplitude Rendering (Map EB690 -JJ-3) shows normal (ambient) background amplitudes at the seafloor around this location. Subbottom profiler and side-scan sonar data covering much of the 2,000 ft radius show no evidence of near-surface gassy sediments, high-backscatter, or other indications of benthic communities near the proposed location (Figures EB690-JJ-3 and JJ-4). AUV data was not collected in the southern third of the 2,000 ft radius (Figure EB690-JJ-3). No mounds, depressions, or hard bottom features occur within a 2,000 ft radius around the proposed wellsite. The potential for high-density chemosynthetic and other bent hic communities within 2,000 ft of the proposed location is negligible. Stratigraphy. The stratigraphy at the proposed well loca tion is illustrated on Figures EB690-JJ-1, JJ-2, and JJ-4.
The subbottom profiler data show approximately 350 ft of well-stratified, hemipelagic, clay-rich, sediments beneath the seafloor at the proposed location (Fi gure EB690-JJ-4). The nearly transparent drape of presumably very soft, high water cont ent pelagic clays is approximately 7 ft thick at the proposed location. The soils beneath the drape will gradually increase in strength and decrease in water content with depth. The Tophole Prognosis Chart (Figure EB690-JJ-2) shows the inline annotated with calculated depths to the various horizons and predicted lithology of the sequence s, along with their potential for shallow water flow and shallow gas. In general, the sediments between t he seafloor and the limit of investigation (about 5,717 ft bml) consist of hemipelagic silts and clays, bedded turbidites, slope-fan, and mass-transport deposits. The shallow section, seafloor to Horizon 20 (0 ft to 724 ft bml) will likely consist of predominantly clays and silts. Similar sediments interbedded with thin sand layers are likely in the Horizon 20 to Horizon 30 unit (724 ft to 1,577 ft bml). Sands are possible from Horizon 30 to the limit of investigation (5,717 ft bml). Potentially thick sand layers may occur within turbidites and mass-transport deposits in the Horizon 30 to Horizon 40 sequence between 1,577 ft to 2,731 ft bml. The slope-fan deposits may correspond to the regional slope-fan sequence known as the GB Orange Unit. Thick sand layers may also be encountered from 3,075 ft to 3,646 ft bml and 4,733 ft to 5,717 ft bml (limit of investigation).Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 5 FORUM ENERGY TECHNOLOGIES, INC. Faults. The near-surface section shows numerous faults (Figure EB690-JJ-4). The proposed location is approximately 650 ft west of a buried fault. The propos ed site is on the upthrown side of the buried fault; therefore, the surface casing will not intersect the faul t plane. No faults will be intersected in the upper ~350 ft bml (Figure EB690-JJ-4). Two seafloor faults and one buried fault will be penetrated by a vertical well bore in the shallow section between the seafloor and 5,717 ft bml (limit of investigation) at the Proposed Wellsite EB 690-JJ location (Figures EB690-J J-1 and JJ-2). The seafloor faults will be penetrated at 855 ft and 2,649 ft bml. The faults are about 856 ft and 2,243 ft west of the proposed wellsite location. The fault generally trends north to south and is down thrown to the east towards the proposed wellsite (Maps EB690-JJ-2 through JJ-4).
The buried fault will be penetrated at about 5,044 ft bml. Potential high-amplitude zones occur along some of thes e faults, but not directly at the well bore/fault intersections. The “brightening” of amplitudes within the subsurface is an indication that gas/fluid is potentially migrating along the faults. We recommend c aution while drilling through these faults as there is an increased potential for encountering gas.

Shallow Gas and Sh allow Water Flow. The potential for shallow gas and shallow water flow at this well location varies from negligible to moderate at the proposed wellsite (Figure EB690-JJ-2).

Shallow Gas. A vertical well bore at the proposed well location will not penetrate any high-amplitude anomalies between the seafloor and at least 5,717 ft bm l, the limit of investigation; Map EB690-JJ-4. The potential for encountering shallow gas at the Proposed Wellsite EB690-JJ is low to moderate in zones from Horizon 20 (724 ft bml) to the limit of investigat ion (Figure EB690-JJ-2). A moderate potential for encountering shallow gas exists in the intervals be tween 1,577 ft to 2,731 ft bml, 3,075 ft to 3,646 ft bml, and 4,733 ft to 5,717 ft bml (limit of investigation). The potential for encountering interbedded sand layers near the proposed wellsite is likely in these intervals. A low potential occurs in the intervals between 724 ft to 1,577 ft bml, 2,731 ft to 3,075 ft bml, and 3,646 ft to 4,733 ft bml. There is a negligible potential for encountering shallow gas in the sequences from the seafloor and Horizon 20 (724 ft bml).

Shallow Water Flow . There is a moderate potential for shallo w water flow within four sand-prone units (Figure EB690-JJ-2). The shallowest unit is from 724 ft to 1,577 ft bml (Horizon 20 to Horizon 30). This stratigraphic interval likely contains sand-prone, bedded turbidite deposits. Drilling reports indicate the Maxus EB 645 #001 well, approximately 3,993 ft northwest of the proposed wellsite, experienced shallow water flow conditions within this shallow turbidite sequence (BOEM, 2012b). Similar stratigraphic conditions can also be correlated to the Anadark o SS007/SS008 wells in the northwestern portion of EB 646, the SS006/001 wells in the southwestern porti on of the block, and the A nadarko #001 in the northcentral portion of EB 690. These wells did not repor t shallow water flow from the shallow sequence (BOEM, 2012b). However, we recommend designing yo ur casing program to take into account the potential for shallow water flow within this interval.
The next stratigraphic interval with a moderate potential for shallow water flow is between 1,577 ft to 2,731 ft bml and consists of stacked, slope-fan and turbid ite deposits. These deposits may correlate with the regional, slope fan sequence known as the Garden Banks (GB) Orange Unit. A moderate potential for shallow water flow also exists within the sand-pro ne intervals from 3,075 ft to 3,646 ft bml and from 4,733 ft to the limit of investigation at 5,717 ft bml (Figure EB 690-JJ-2). Although existing wells within and adjacent to EB 690 did not report shallow water flow from simi lar intervals, continuous sand seams could be present, some of which may be overpressured.
The potential for shallow water flow is low from 2,731 ft to 3,075 ft bml and 3,646 ft to 4,733 ft bml. Sands may be present within these intervals; however, they ar e not likely to be signific antly overpressured. The remaining stratigraphic sequences at the proposed wellsite have a negligible potential for encountering shallow water flow.



### Anchor Locations
A 13,000-ft radius (12,000 ft maximum anchor spread as required during hurricane season plus a 1,000 ft buffer zone) is outlined on Maps EB690-JJ-1 through JJ -4 to represent an area that may be impacted by a generic anchoring configuration. The radius is the bas is for clearance of seafloor conditions relating to anchoring considerations.Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 6 FORUM ENERGY TECHNOLOGIES, INC. Water depths within the potential 13,000 ft mooring area range from about -3,290 ft to -4,580 ft (Map EB690-JJ-1). The northwest portion of the anchor radius is highly-f aulted and irregular. The irregular seafloor conditions in these areas are associated with several seafloor faults that occur within a large, northeast-southwest trending fault system along the west ern flank of Humphries Basin (Map EB690-JJ-2). Seafloor mounds are also present. The seafloor ac ross the western, southern, and eastern areas is generally smooth and featureless. Slopes along the various fault escarp ments range from approximately 3° to 46°. Irregular and mounded seafloor downdip of the faults, particularly in the no rth-central portion of the anc hor radius, are likely the result of localized slumping fr om oversteepening along the faults.
The seafloor in the far western porti on of the radius gently dips to the southwest in EB 645 and southeast in the northern portion of EB 689. The seafloor in the sout hern portion dips to the northeast across most of EB 689 and to the east in EB 690 at about 2° to 5°. The northeast dipping seafloor in EB 689 is the result of a topographic high centered in block EB 733 to the south. The seafloor in the eastern portion of the radius dips to the east into Humphries Basin. Av erage gradients within this area range from 2o to 5o.
There is one small seafloor amplitude anomaly observ ed within the probable radius for this wellsite (Map 690-JJ-3). This anomaly lies along a fault in EB 646 approximately 2 miles north-northeast of the proposed wellsite. AUV side-scan sonar and subbottom pr ofiler data reveal high-backscatter intensity and near-surface acoustic voids near the anomaly. Be nthic communities are possible within these patches; however, significant high-density co mmunities are unlikely. We reco mmend that the anomaly be avoided by at least 500 ft when planning an anchor mooring pa ttern. Four seafloor mounds exist in the northwestern quadrant of the anchor radius along the eastern margin of EB 645. These mounds occur along the downthrown side of the seafloor fault escarpments, approximately 7,920 ft to 10,913 ft northnorthwest of the proposed wellsite. No elevated amplitude responses at the seafloor are associated with these features in the 3D data. High-resolution AU V data reveals high-sonar backscatter and near-surface acoustic voids, indicating gassy sediment near thes e seafloor mounds. We recommend that the mounds be avoided by at least 500 ft when planning an anchor mooring pattern at this location.
Elevated amplitudes within the southeast quadrant of the anchor radius are data artifacts and do not represent any potential hazards that require avoidance.



### Closing
The Proposed Wellsite JJ in East Breaks Block 690 appears suitable fo r exploration drillin g operations. However, caution is advised while drilling through potent ially sand-prone intervals identified from 724 ft to 2,731 ft bml, 3,075 ft to 3,646 ft bml, and from 4,733 ft to the limit of investigation at 5,717 ft bml. Shallow water flow is more likely to be encountered within these stratigraphic units. Caution is advised while drilling th rough the faults at 855 ft, 2,649 ft, and 5,044 ft bml where gas may be encountered along the fault planes. We recommend avoidi ng the seafloor mounds north-northwest of the proposed wellsite when planning an anchor mooring pattern for this location.
We appreciate the opportunity to be of service to Anadarko Petroleum Corporation and look forward to working closely with you on other projects.

Sincerely,

GEOSCIENCE EARTH & MARINE SERVICES, INC. ®

Lisa A. Majzlik Daniel Lanier Geoscientist Vice President - Geoscience

Attachments: (4 Maps and 4 Figures)Project No. 0212-2051 Anadarko Petroleum Corporation // March 28, 2012

Geoscience Earth & Marine Services, Inc. ® // 7 FORUM ENERGY TECHNOLOGIES, INC. Distribution: Mr. Rick Kincaid, Anadarko Petroleum Corporation, The Woodlands, TX (6 copies)

References:
Bureau of Ocean Energy Management (BOEM), 2011 a, Pre-Seabed Disturbance Survey Mitigation <http://www.gomr.boemre.gov/homepg/regulate/environ/archae ological/Conditional-Archaeological-Mitigation.pdf.
BOEM (Bureau of Ocean Energy Management ), 2011b, Notice to lessees and operators (NTL) of federal oil and gas leases and pipeline right-of-way (ROW) holders on the outer cont inental shelf (OCS), Revisions to the list of OCS lease blocks requiring archaeological resource surveys and report s: U. S. Department of the Interior, Bureau of Ocean Energy Management, Bureau of Safety and Environment al Enforcement Gulf of Mexico Region (GOMR), NTL 2011- JOINT-G01. Effective Date December 29, 2011.
BOEM (Bureau of Ocean Energy Managem ent), 2012a, ASCII Data Files, publish ed on the BOEMRE Gulf of Mexico Region Homepage: <http://www.gomr.boem.gov/homepg/p ubinfo/freeasci/freedesc.html >, Accessed Jan, 2012.
BOEM (Bureau of Ocean Energy Man agement), 2012b, Safety performance review-Shallow Waterflows Can Pose Significant hazards to deepwater drilling, http://www.gomr/mms.gov/homepg/ offshore/sftey/watrflow.html website accessed Jan, 2012.
C & C Technologies, Inc., 2011, Archaeological Assess ment Report; Nansen, Erik sson, and Mawson Exploration Prospect, Blocks 602 (OCS-G-14205), 645 (OCS-G-32822), and 646 (OCS-G-20725), East Breaks Area, Gulf of Mexico, Project No. 110397.
Geoscience Earth & Marine Services, Inc. ® (GEMS), 2010, Geologic and stratigraphic assessment, blocks 689 and 690, East Breaks Area, Gulf of Mexico, Project No. 0610-1788.
Geoscience Earth & Marine Services, Inc.® (GEMS), 2007, Geologic and stratigraphic assessment, block 646 (OCS G20725), East Breaks Area, Gulf of Mexico, Project No. 0607-1352.
Geoscience Earth & Marine Services, Inc.® (GEMS), 2009, Geologic and stratigraphic assessment, blocks 602 and 645, East Breaks Area, Gulf of Mexico, Project No. 0409-1634.
Minerals Management Service, 2005, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shelf, Gu lf of Mexico OCS region, Archaeological resource surveys and reports: U. S. Department of the Interior, Mineral s Management Service, Gulf of Mexico, NTL 2005-G07.
Minerals Management Service, 2008a, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shel f, Gulf of Mexico OCS region , information re quirements for exploration plans and development oper ations coordination documents: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NTL 2008-G04.
Minerals Management Service, 2008b, Notice to lessees and operators of federal oil, gas, and sulphur leases and pipeline right-of-way holders in the outer continental shelf, Gulf of Mexico OCS region, shallow hazards requirements: U. S. Department of the Interior, Minerals Mana gement Service, Gulf of Mexico, NTL 2008-G05.
Minerals Management Service, 2008c, Notice to lessees and o perators of federal oil, gas, and sulphur leases in the outer continental shelf, Gulf of Mexico OCS region; remote ly operated vehicle surveys in deepwater, U. S. Department of the Interior, Minerals Management Se rvice, Gulf of Mexico, NTL 2008-G06.
Minerals Management Service, 2009, Notice to lessees and o perators of federal oil and gas leases and pipeline rightof-way holders on the outer continental shelf, Gulf of Mexico OCS region, Milit ary Warning and Water Test Areas: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NTL 2009-G06. Effective Date April 22, 2009.
Minerals Management Service, 2010, Notice to lessees and operators of federal oil and gas leases in the outer continental shelf, Gulf of Mexico OCS region, deepwater benthic communities: U. S. Department of the Interior, Minerals Management Service, Gulf of Mexico, NT L 2009-G40. Effective Date January 27, 2010.