**MAPS SHOWING GEOLOGY, OIL AND GAS FIELDS ANDGEOLOGIC PROVINCES OF IRAN**version 1.0
**Compiled by ****by R. M. Pollastro 1 , F. M. Persits2 , and D. W. Steinshouer 2**
**Open-File Report 97-470G**
This report is preliminary and has not been reviewedfor conformity with U. S. Geological Survey editorial standards and stratigraphicnomenclature. Any use of trade names is for descriptive purposes only anddoes not imply endorsement by the U. S. government. This Open FileReport is available on CD-ROM.Pleasecontact Christa Lopez.  ClickHEREto view contents.*[Features on this page are fully functionalusing the following browsers: **Netscape Navigator version 3.0 or higher, MicrosoftInternet Explorer version 4.0 or higher]*
**Table of Contents****Introduction****Data processing steps****References****Geologic provinces in Iran, sorted by province code****Geologic provinces in Iran, sorted by province name****Map showing faults, oil and gas fields, and geologic provinces of Iran****Map showing geology, oil and gas fields and geologic provinces of Iran**
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**I.  INTRODUCTION**This digitally compiled map includes geology, oil and gas field centerpoints, geologic provinces,and major faults of Iran with some of these components extended into geographically adjacentareas. This digital compilation is an interim product of the U.S. Geological Survey's WorldEnergy Project (WEP) and part of a series on CD-ROM. The goal of the WEP is to assess theundiscovered, technically recoverable oil and gas resources of the world and report the result ofthis assessment in the year 2000. For data management purposes, the world was divided into eightenergy regions corresponding approximately to the economic regions of the world asdefined by the U.S. Department of State.
Each world energy region was then further divided into geologic provinces on the basis of naturalgeologic entities and may include a dominant geologic structural element or a number ofcontiguous elements. Some provinces contain multiple, genetically-related basins. Geologicprovince boundaries for Iran were delineated using data from different geologic maps,publications, and other tectonic and geographic data. Each province was assigned a unique number;the first digit is the region number. An attempt was made to number the provinces in geographicalorder or groups with numbering starting at the Arabian Shield (see Pollastro and others, 1998).The list of provinces sorted by number is shown to the right of the map.
Centerpoints of oil and gas fields are shown and were plotted with permission fromPetroconsultants International Data Corporation, 1996 worldwide oil and gas field database.Allocation of field data to geologic provinces provided a ranking of the provinces by total knownpetroleum volume (see Klett and others, 1997). The WEP further characterizes the geologicprovinces by petroleum system and assessment units in order to assess the undiscovered petroleumvolume.
Specific details of map and data sources, and the procedure used in the compilation of thisgeologic map of Iran are given in the metadata file and described briefly in the text below.Stratigraphic subdivisions of Phanerozoic rocks were combined to simplify the geology andmaintain consistency with other maps in this series. Precambrian rocks are undivided.This map was compiled using Environmental Systems Research Institute, Inc.(ESRI) ARC/INFOsoftware. Political boundaries and cartographic representations are used, with permission,from ESRI's ArcWorld 1:3M digital coverages, have no political significance, and are displayedfor general reference only.
**II.  Data processing steps**This map has been digitally compiled and abstracted from The Geological Map of Iran, (1985)Compiled by A. Haghipour and A. Aghanabati, Ministry of Mines and Metals, Geological Surveyof Iran, Scale 1:2,500,000.
The projection information written on the original map is ".. adjusted from PolyconicProjection of International 1:1000000 Map of the Earth". Because such projection is notdirectly supported by ESRI's ARC/INFO software, it was necessary to georeference the mapto the one of known projections. This was done as follows:

1. The latitude/longitude grid with cell size 2 * 2 degrees was projected to LambertConformal Conic projection and then used to create ARC/INFO point coverage. That pointcoverage was used to create "to - from" links by ARC/INFO CONTROLPOINTS program.
2. A gray-scale scanned image of the original paper map was transformed to Lambert ConformalConic projection by ARC/INFO GRIDWARP program (polynomial of the second order) using the"to - from" links created by CONTROLPOINTS program.
3. Geologic polygon boundaries from the source map were initially transfered to mylar and thenscanned to produce a binary image.
4. The binary image from step 3 with geologic boundaries was vectorized by ARC/INFO GRIDLINEutility and then supplemented by hands-on digitization.
5. Polygon boundaries and geologic attributing of the ARC/INFO coverage from step 4were verified and corrected by using gray-scale image from step 2 as a background guide.
6. A series of piecewise "rubbersheet" transformations was applied to the final ARC/INFOcoverage. The ARC/INFO coverages that were used for transformation were ESRI's ArcWorld1:3M GIS cartographic layers (RIV3M, CTRY3M). Overall RMS error of that transformation isequal to 1,500 meters (0.6 mm on original paper map).
**III.  REFERENCES**
Alsharhan,A.S., and Nairn, A.E.M., 1997, Sedimentary Basins and Petroleum Geologyof the Middle East, Elseveir, Amsterdam, 942 p..
Beydoun,Z.R., 1991, Arabian plate hydrocarbon geology and potential -- A plate tectonicapproach: Amer. Assoc. Petrol. Geologists, Studies in Geology 33, 77 p.
Environmental Systems Research Institute,Inc.,1992, ArcWorld 1:3M, Environmental SystemResearch Institute (ESRI). Digital database available from ESRI, 380 New York Street,Redlands, CA 92373-8100.
Haghipour,A., and Aghanabati,A (compilers),1985, Geologic Map of Iran: Ministry of Minesand Metals, Geological Survey of Iran, one plate.
International Geologic Map of Africa, 1959, Plate 3, 1:5,000,000, International GeologicCongress, Association of Geologic Services of Africa, Paris, France.
Klett, T.R., Ahlbrandt T.S., Schmoker, J.W., and Dolton, G.L., 1997,Ranking of World's oil and gas provinces by known petroleum volume: U.S. Geological SurveyOpen File Report 97-463, one CD-ROM.
Petroconsultants, 1996, Petroleum exploration and production database: Petroconsultants,Inc., Houston, Texas (database available from Petroconsultants, Inc., P.O. Box740619, Houston, Texas 77274-0619).
Pollastro R.M., Karshbaum A.S, and Viger R.J. , 1998, Map showing geology, oil and gasfields, and geologic provinces of the Arabian peninsula:U.S. Geological Survey Open File Report 97-470B, one CD-ROM.
Persits F.M., Ulmishek G.F., and D.W. Steinshouer., 1997, Map showing geology, oil and gasfields, and geologic provinces of the Former Soviet Union:U.S. Geological Survey Open File Report 97-470E, one CD-ROM.  
1U.S. Geological Survey, Denver, CO2Contractor to the U.S. Geological Survey, Denver, CO** U. S. GeologicalSurvey Open-File Report 97-470G**
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