| U. S. DEPARTMENT OF THE INTERIORU. S. GEOLOGICAL SURVEY
**U. S. Geological Survey Digital Data Series 67 ** 
**Geologic Studies of Deep Natural Gas Resources ** 
Edited by Thaddeus S. Dyman and Vello A. Kuuskraa1 

Version 1.0 First replication 2001 ISBN: 0-607-95407-8 Copies are available from: USGS Information Services Box 25286, Federal Center Denver, CO 80225 
Call: (303) 202-4200 For more information on Deep Natural Gas Resources contact: Ted Dyman dyman@usgs.govphone: (303) 236-5730 Box 25046, Denver Federal Center, MS 939 Denver, CO 80225-0046 
The files in DDS-67 are in PDF format requiring Adobe AcrobatReader or similar software, and are accessible as defined by Section508. If you do not already have Acrobat Reader version 4.0or later, you may download the latest version here. 
**Volume Contents****Chapter A.**  **Volume Contents,**Introduction,ReferencesBy Thaddeus S. Dyman and Vello A. Kuuskraa 
**CONTENTS: ChapterB.** Summary of Deep Oil and Gas Wells in the United States Through1998 By Thaddeus S. Dyman and Troy A. Cook 
**CONTENTS: ChapterC.**Geology and Natural Gas Potential of Deep Sedimentary Basinsin the Former Soviet Union By Thaddeus S. Dyman, Vadim A. Litinsky, and Gregory F. Ulmishek 
**CONTENTS: ChapterD.** Comparison of Kinetic-model Predictions of Deep Gas Generation By Allison A. Henry and Michael D. Lewan 
**CONTENTS: ChapterE.**Gas: Oil Ratios for Source Rocks Containing Type-I, -II, -IIS,and -III Kerogens as Determined by Hydrous Pyrolysis By Michael D. Lewan and Allison A. Henry 
**CONTENTS: ChapterF.** Probabilistic Method for Subdividing Petroleum Resources intoDepth Slices By Robert A. Crovelli 
**CONTENTS: ChapterG.** Relative Uncertainty of Conventional Natural Gas Plays in theGulf Coast Region By Thaddeus S. Dyman, James W. Schmoker, and Christopher J. Schenk 
**CONTENTS: ChapterH.** A Possible Deep-Basin High-Rank Gas Machine Via Water Organic-MatterRedox Reactions By By Leigh C. Price 

 In 1997, the U. S. Geological Survey published USGS Bulletin 2146,comprising 12 chapters dealing with geologic, geochemical, and assessmentissues related to deep gas resources (Dyman and others, 1997). A primarygoal of that report was to provide geology-based information that mightaid in future improvements to technology for deep gas exploration and development.Chapters of this report  represent a continuation of that work. Thecurrent work is funded by the U. S. Department of Energy, National EnergyTechnology Laboratory, Morgantown, W. Va. (contract No. DE-AT26-98FT40032), Gas Technology Institute (GTI), Chicago, Ill. (contract No. 5094-210-3366through a Cooperative Research and Development Agreement with AdvancedResources International, Arlington, Va.), and  the U. S. GeologicalSurvey, Denver, Colo.
Chapters in the present report summarize major conclusions of this ongoingwork.  
**Chapter A**,  Introduction, Acknowledgements,and References.  
**Chapters B and**C address the areal extent of drilling and thedistribution of deep basins: **Chapter B** providesan update of deep drilling in the U. S. during the 1990's, and **ChapterC** summarizes the  distribution of deep sedimentary basinsand the potential for deep gas in the Former Soviet Union.  
**Chapters D and E** are geochemical papers addressing source-rockissues and deep gas generation. **Chapter D**presents gas generation kinetic models based on laboratory pyrolysis methodsand examines them for hypothetical basin scenarios based on end-memberheating rates of 1 o and 10 o C/ m. y. **Chapter E**presents gas: oil ratios (GOR) from hydrous-pyrolysis experiments conductedon immature source rocks and summarizes how they are affected by kerogentype. The quantity of expelled oil and the gas generated during hydrouspyrolysis allows for the calculation of GOR's for a particular source rockat hydrous-pyrolysis temperatures representing different stages of oilgeneration. 
**Chapters F and G** discuss assessment issues related to deep gas.In **Chapter F**, a probabilistic method is developedfor subdividing gas resources into depth slices. This is important fordeep natural gas assessments because gas plays often range across manydepth intervals, and estimating the amount of gas in each interval aidsin both geologic and economic analysis of the play and province. In **ChapterG**, the relative uncertainty of estimates of deep gas in plays inthe Gulf Coast region is analyzed. More than 60 plays in the Western Gulfand Louisiana-Mississippi Salt Basins provinces are compared and analyzedfor their conditional uncertainty. 
**Chapter H** evaluates the mechanism of hydrogenationof deep, high-rank spent kerogen by water, with subsequent generation ofmethane-rich HC gas. The editors note with regret the untimely death, in August 2000, of organic geochemist Leigh C. Price, the author of ChapterH. 
**Disclaimer for the CD-ROM set, DDS-67**The Compact Disc-Read Only Memory (CD-ROM) publicationwas prepared by an agency of the United States Government.  Neitherthe United States Government nor any agency thereof, nor any of their employees,makes any warranty, expressed or implied, or assumes any legal liabilityor responsibility for the accuracy, completeness, or usefulness of anyinformation, apparatus, product, or process disclosed in this report, orrepresents that its use would not infringe privately owned rights. Referencetherein to any specific commercial product, process, or service by tradename, trademark, manufacturer, or otherwise does not necessarily constituteor imply its endorsement, recommendation, or favoring by the United StatesGovernment or any agency thereof. ___________________________1Advanced ResourcesInternational, 1110 N. Glebe Rd., Suite 600, Arlington, VA 22201.
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