05-MYM UTP Geophysics Int Reservoir Mapping Method #1

SUBSURFACE OIL & GAS MAPPING RESOURCE VOLUME DETERMINATION METHODS 3 hours Lab Md Yazid Mansor UTP FGPE IE Petroleum Basin Studies

Beginners Grade / Sparse Data Method #1 : Area-Thickness (Geometric Corrected Tank Model GRV) Intermediate Grade / Few Data Method #2 : Area-Depth Plot (Gross Rock Volume) Advance Grade / Some Data Method #3 : Isopach Cross-Contour Mapping GRV (Area Thickness Plot) Classical Advance Grade Method #4 : Isopach Cross-Contour Mapping GRV (Trapezoidal Rule) Classical Advance Grade Method #5 : Isopach Cross-Contour Mapping GRV (Pyramidal Rule)

SUBSURFACE OIL & GAS RESOURCE VOLUME DETERMINATION METHODS

Fundamentals of Gross Rock Volume Derivation Md Yazid Mansor UTP FGPE IE Petroleum Basin Studies

• If Data Available is restricted to Area & Thickness information ONLY, the Calculation of STOIIP or GIIP formula is :

o STOIIP (stb) = 7758 x A x h x G C x N/G x phi x So x 1/Boi

oGIIP (scf) = 43560 x A x h x GC x N/G x phi x Sg x Bgi Where, o STOIIP [stock tank barrels] o GIIP [standard cubic feet] o 7758 = Conversion factor (acre-ft * 7758 = barrels) o 43560 = Conversion factor (acre-ft * 43560 = scf) o A = Area [acres] o h = Gross pay thickness (feet) o GC = Geometric Correction Factor (decimal) o N/G = Net Reservoir Pay to Gross Reservoir Pay thickness proportion (decimal) o phi = Porosity of net reservoir rock (decimal) o So = Oil saturation , oil-filled portion of this porosity (decimal) o Sg = Gas saturation , gas-filled portion of this porosity (decimal) o 1/Boi = Oil Formation Volume Factor (decimal). Expresses the change in oil volume between reservoir and

standard conditions at surface (unit in reservoir barrels / stock tank barrels) o Bgi = Gas Formation Volume Factor (decimal). Expresses the change in gas volume between reservoir and standard

conditions at surface (unit in standard cubic feet / reservoir cubic feet)

• If the metric system is being used, a conversion factor of 6.289808 can be used to convert cubic metres to stock tank barrels.

• 1 cubic metre container would hold 6.289808 barrels of oil. • For gas, 1 cubic metre container would hold 35.315 cubic feet of gas.

SUBSURFACE OIL & GAS RESOURCE VOLUME DETERMINATION METHODS

Fundamentals of Method #1 : Area-Thickness (Geometric Corrected Tank Model GRV) Md Yazid Mansor UTP FGPE IE Petroleum Basin Studies

• Exercise #A (40 mins): You will each receive an A4 size Base Map, observe the information on the map. You are also provided a Seismic Marker Horizon TWT Isochron Map of the same scale, and a

Seismic Stacking Velocity Data, tabulation & x-y plot. Using the above information, generate a Horizon Marker Depth Structure Map and draw these

depth contours onto an A4 tracing paper with a carbon pencil. Label the Depth Contours appropriately.

• Exercise #B (5 mins): How would you describe this trap style? What is the crestal depth value? What is the possible spill-points and its values? What is the Structural Relief of the trap?

• Exercise #C (15 mins):

This trap is undrilled, what is the Prospective Resource (STOIIP) volume in this trap? You may elect to do either a Minimum Case, Most Like Case or Maximum Case.

o Area = Measure your choice of Trap Closure, use the horizontal map scale. o Gross pay thickness = Assume a thickness range of 25 – 75 m tvt (true vertical thickness) o Estimate of Geometric Correction factor = 0.6 – 0.9 o Net Reservoir to Gross Reservoir proportion = 50 - 90% o Porosity of net reservoir rock = 15 - 25% o Water Saturation = 35 – 65% o Oil Formation Volume Factor , 1/Boi = 0.72 stb/rb

given STOIIP (stb) = 7758 x A x h x G C x N/G x phi x So x 1/Boi

This is your Pre-Drill Prospective Resource STOIIP value.

SUBSURFACE OIL & GAS RESOURCE VOLUME DETERMINATION METHODS

Fundamentals of Method #1 : Area-Thickness (Geometric Corrected Tank Model GRV) Md Yazid Mansor UTP FGPE IE Petroleum Basin Studies

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COMPANY : UTP PG Undergrads PROSPECT/FIELD : UTP - XA RESERVOIR : Mid-Mio S1 Marker Horizon MAP : TWT Isochron

Datum : Mean sea-level Contour Interval : 100 msec TWT Scale AUTHOR: MYM Consulting DATE: Nov 2013 REPORT NO: ENCL NO:

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COMPANY : UTP PG Undergrads PROSPECT/FIELD : UTP - XA RESERVOIR : Mid-Mio S1 Marker Horizon MAP : TWT Ishochron & Well Sites

Datum : Mean sea-level Contour Interval : 100 msec TWT Scale AUTHOR: MYM Consulting DATE: Nov 2013 REPORT NO: ENCL NO:

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2600 ms Where would you site the first wildcat well? Drillers do not understand TWT Isochron Map..

UTP FGPE Geophysical Interpretation & Volumetrics

Md Yazid / Luluan

Nov-13

UTP Prospect Stacking Velocity data

TWT Depth Incident time Avg Vel

mSec mss mSec m/sec

0 0 0.0 0.0

200 -150 100.0 -1500.0

500 -420 250.0 -1680.0

750 -640 375.0 -1706.7

1000 -865 500.0 -1730.0

1150 -998 575.0 -1735.7

1300 -1130 650.0 -1738.5

1440 -1280 720.0 -1777.8

1610 -1450 805.0 -1801.2

1800 -1665 900.0 -1850.0

1915 -1785 957.5 -1864.2

1990 -1860 995.0 -1869.3

2060 -1940 1030.0 -1883.5

2130 -2020 1065.0 -1896.7

2220 -2140 1110.0 -1927.9

2300 -2260 1150.0 -1965.2

2340 -2340 1170.0 -2000.0

2410 -2490 1205.0 -2066.4

2500 -2660 1250.0 -2128.0

2650 -2885 1325.0 -2177.4

2800 -3115 1400.0 -2225.0

3000 -3450 1500.0 -2300.0

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FGPE UTP Prospect Mapping Exercise

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COMPANY : UTP PG Undergrads PROSPECT/FIELD : UTP - XA RESERVOIR : Mid-Mio S1 Marker Horizon MAP : Top Depth Structure/ Wellsites

Datum : Mean sea-level Contour Interval : 100 m Scale AUTHOR: MYM Consulting DATE: Nov 2013 REPORT NO: ENCL NO:

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Datum : Mean sea-level Contour Interval : 100 m Scale AUTHOR: MYM Consulting DATE: Nov 2013 REPORT NO: ENCL NO:

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COMPANY : UTP PG Undergrads PROSPECT/FIELD : UTP - XA RESERVOIR : Mid-Mio S1 Marker Horizon MAP : Top Depth Structure/ Wellsites

Datum : Mean sea-level Contour Interval : 100 m Scale AUTHOR: MYM Consulting DATE: Nov 2013 REPORT NO: ENCL NO:

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COMPANY : UTP PG Undergrads PROSPECT/FIELD : UTP - XA RESERVOIR : Mid-Mio S1 Marker Horizon MAP : Top Depth Structure/ Wellsites

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Min, ML, Max Closures