A QUICKLOOK DETERMINATION OF OIL-IN-PLACE IN OIL SHALE
A QUICKLOOK DETERMINATION OF OIL-IN-PLACE IN OIL SHALE RESOURCE PLAYS Marlan W. Downey, Julie Garvin, RC Lagomarsino, David F. Nicklin ACKNOWLEDGEMENTS: Roxanna Oil and Gas Company Eddie Little Matador Resources Company
Anne Lindsey McColloch Justin Bagley Bo Henk DISCUSSION TOPICS Gas-in-place measurements in the Coal and Shale Gas Industry Gas desorption methodology Importance of Hydrocarbon Target Volumes in Unconventional Resource Plays
Measure amount of Hydrocarbons available Application of RockEval Pyrolysis for S1 values GAS DESORPTION METHODOLOGY Standard analytical technique over 20 years Measures total gas contained in coal cores or shale cores. Allows the determination of the total gas resource in place in a given area. HYDROCARBON TARGET VOLUMES
Focus on application of hydrocarbon distillation from Rock-Eval. Requires rock samples, preferably whole core, properly collected. Determines volumes of distillable hydrocarbons in the rock in mg of hydrocarbon/g of dry rock. Relatively simple and cheap to do. Results can be obtained early in exploration campaign. Easily up-scaled to reflect total rock potential.
HYDROCARBON TARGET VOLUMES Emphasis on S1 measurement of distillable hydrocarbons. Rock Eval Pyrolysis S1 represents the free hydrocarbons in a rock Primarily indicates generated free oil (liquid hydrocarbons) The greater the S1 value, the greater amount of free oil Optimum data from whole core S1 Peak T max
Volatilizatio n of existing HC S2 Peak Pyrolysis of kerogen (nonvolatile organic Potential matter) Oil Existing Oil TEMPERATURE TIME APPLICATION PROCEDURE
Establish S1 values, preferably from whole core, preferably every foot. This represents measured oilin-place per unit volume of rock. Upscale oil-in-place to Acre-feet or Section-feet (i.e. one square mile of surface area x one foot thick x hydrocarbon richness). Resulting volume from core measurements is a minimum value for the oil-in-place volume. METHODOLOGY: OIL IN PLACE FROM S1 Step 1: grams of oil per section
MS1HC= Ah (Av) (S1Av)(.001) 8.11E-10 acre-ft/cc Where: MS1HC = Mass of S1 hydrocarbons per section (g) A = Area of interest in acres (sectional area 640 acres) h = Reservoir height (ft) Av = Average bulk density (g/cc) S1Av =Average S1 (mg/g) METHODOLOGY (CONT.) Step 2: volume of oil per section (cc) VS1HC = MS1HC oil Where: VS1HC = Volume of S1 hydrocarbons per section (cc) MS1HC = Mass of S1 hydrocarbons per section (g) oil = Density of oil (g/cc) METHODOLOGY (CONT.) Step 3: barrels of oil per section
Oil in Place per section (Bbl) = VS1HC x 6.29E-6 bbl/cc OIL IN PLACE FROM S1 Simplified Equation Oil in Place per 640 acre/ft = 4965.36 x (Av) (S1Av)/(oil) Where: Av = Average bulk density (g/cc) S1Av =Average S1 (mg/g) oil = Density of oil (g/cc) OIL IN PLACE FROM S1 Simplified Equation Oil in Place per 640 acre/ft = 15922.78 x (S1Av) Where:
S1Av =Average S1 (mg/g) Assumes: 2.5 g/cc Bulk Density 50 API Oil Gravity CONVERSIONS 1 section = 640 Acres 1 cc = 8.10713194 E-10 Acre-ft 1 cc = 6.28981077E-6 Bbl Specific gravity = 141.5/(131.5 + API gravity) Specific gravity 1 =1 g/cc 1 mg = .001 g QUICKLOOK CONVERSION OF S1 TO OIL Using S1 in mg/g to BBL of Oil in 640 acres/foot 4.0 S1
S1 (mg/g) CONCLUSIONS Rock-Eval S1 value provides early measurement of oil in place. Can be up-scaled easily for various thicknesses for quantified values of oil-in-place. Measurements of oil-in-place compared to production decline analysis will provide improved measures of recovery efficiency. For further information, check out: www.roxannaoil.com
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