Tanezzuft-Ghadames - USGS Energy Resources Program

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SEVENTH APPROXIMATIONNEW MILLENNIUM WORLD PETROLEUM ASSESSMENTDATA FORM FOR CONVENTIONAL ASSESSMENT UNITSDate:………………………….. 6/16/98Assessment Geologist:…….. T.R. KlettRegion:……………………….. Middle East and North Africa Number: 2Province:……………………… Trias/Ghadames Basin Number: 2054Priority or Boutique.………… PriorityTotal Petroleum System:…… Tanezzuft-Ghadames Number: 205403Assessment Unit:…………… Tanezzuft-Ghadames Structural/Stratigraphic Number: 20540301* Notes from AssessorCHARACTERISTICS OF ASSESSMENT UNITOil (20,000 cfg/bo overall):…OilWhat is the minimum field size?………. 1 mmboe grown (>1mmboe)(the smallest field that has potential to be added to reserves in the next 30 years)Number of discovered fields exceeding minimum size:………… Oil: 66 Gas: 21Established (>13 fields) X Frontier (1-13 fields) Hypothetical (no fields)Median size (grown) of discovered oil fields (mmboe):1st 3rd 15.7 2nd 3rd 14.4 3rd 3rd 26.9Median size (grown) of discovered gas fields (bcfg):1st 3rd 701.7 2nd 3rd 287.4 3rd 3rd 143.7Assessment-Unit Probabilities:Attribute Probability of occurrence (0-1.0)1. CHARGE: Adequate petroleum charge for an undiscovered field > minimum size……………… 1.02. ROCKS: Adequate reservoirs, traps, and seals for an undiscovered field > minimum size…… 1.03. TIMING OF GEOLOGIC EVENTS: Favorable timing for an undiscovered field > minimum size 1.0Assessment-Unit GEOLOGIC Probability (Product of 1, 2, and 3):……...…….....…. 1.04. ACCESSIBILITY: Adequate location to allow exploration for an undiscovered field> minimum size……………………………………………………..………………..……..………… 1.0UNDISCOVERED FIELDSNumber of Undiscovered Fields: How many undiscovered fields exist that are > minimum size?:(uncertainty of fixed but unknown values)Oil fields:…………………………………min. no. (>0) 14 median no. 73 max no. 202Gas fields:……………………………….min. no. (>0) 6 median no. 38 max no. 105Size of Undiscovered Fields: What are the anticipated sizes (grown) of the above fields?:(variations in the sizes of undiscovered fields)Oil in oil fields (mmbo)………………..…… min. size 1 median size 16 max. size 2488Gas in gas fields (bcfg):…………………... min. size 6 median size 70 max. size 3110Page 1
Assessment Unit (name, no.)Tanezzuft-Ghadames Structural/Stratigraphic, 20540301AVERAGE RATIOS FOR UNDISCOVERED FIELDS, TO ASSESS COPRODUCTS(uncertainty of fixed but unknown values)Oil Fields: minimum median maximumGas/oil ratio (cfg/bo)………………………...……… 686 1372 2058NGL/gas ratio (bngl/mmcfg)…………………....…. 20 40 60Gas fields: minimum median maximumLiquids/gas ratio (bngl/mmcfg)….…………..…….. 56 112 168Oil/gas ratio (bo/mmcfg)………………………….…SELECTED ANCILLARY DATA FOR UNDISCOVERED FIELDS(variations in the properties of undiscovered fields)Oil Fields: minimum median maximumAPI gravity (degrees)…………………….…………. 30 42 52Sulfur content of oil (%)………………………...…..Drilling Depth (m) ……………...…………….…….. 1200 2800 4500Depth (m) of water (if applicable)……………...…..Gas Fields: minimum median maximumInert gas content (%)……………………….....……CO 2 content (%)……………………………….....…Hydrogen-sulfide content (%)………………...…….Drilling Depth (m)…………………………………… 1000 3050 7000Depth (m) of water (if applicable)………………….Page 2
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Tanezzuft-Ghadames - USGS Energy Resources Program

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