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.


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.


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

MYM UTP BASEMAP NOV 2013

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

COMPANY : PROSPECT/FIELD : RESERVOIR : MAP :

Datum : Mean sea-level Contour Interval : Scale AUTHOR: DATE: REPORT NO: ENCL NO:

0 kilometer 2

Base Map

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


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:

0 kilometer 2

1800 ms

2400 ms

2200 ms

2000 ms

1800 ms

2400 ms

2600 ms Given Isochron Map

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


1800 ms

2400 ms

2200 ms

2000 ms

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:

0 kilometer 2

1800 ms

2400 ms

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

-4000

-3500

-3000

-2500

-2000

-1500

-1000

-500

0

0 500 1000 1500 2000 2500 3000 3500

Dep

th (

mss

)

TWT (mSec)

FGPE UTP Prospect Mapping Exercise

Seismic Stacking Velocitymym

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


UTP-XA

UTP-XC

UTP-XD

UTP-XE

UTP-XB

UTP-XF

UTP-XH

UTP-XG

-1700 mss

-2400 mss

-2000 mss

-1900 mss

-1700 mss

-2300 mss

-2700 mss

-1800 mss

-2100 mss

-2300 mss -2200 mss

-2500 mss

-2500 mss

-2600 mss -3000 mss

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:

0 kilometer 2

Drillers need Depth Structure Map

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

-1700 mss

-2400 mss

-2000 mss

-1900 mss

-1700 mss

-2300 mss

-2700 mss

-1800 mss

-2100 mss

-2300 mss -2200 mss

-2500 mss

-2500 mss

-2600 mss -3000 mss

0 kilometer 2



0 kilometer 2

Minimum Case Closure

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

-1700 mss

-2400 mss

-2000 mss

-1900 mss

-1700 mss

-2300 mss

-2700 mss

-1800 mss

-2100 mss

-2300 mss -2200 mss

-2500 mss

-2500 mss

-2600 mss -3000 mss

0 kilometer 2



0 kilometer 2

Maximum Case Closure

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

UTP-X

-1700 mss

-2400 mss

-2000 mss

-1900 mss

-1700 mss

-2300 mss

-2700 mss

-1800 mss

-2100 mss

-2300 mss -2200 mss

-2500 mss

-2500 mss

-2600 mss -3000 mss

0 kilometer 2



0 kilometer 2

Most Likely Case Closure

202000 201000 203000 204000 205000 206000

701000

702000

703000

704000

705000

0 kilometer 2


UTP-XA

UTP-XC

UTP-XD UTP-XB

UTP-XF

UTP-XH

UTP-XG

UTP-XE

-1700 mss

-2400 mss

-2000 mss

-1900 mss

-1700 mss

-2300 mss

-2700 mss

-1800 mss

-2100 mss

-2300 mss -2200 mss

-2500 mss

-2500 mss

-2600 mss -3000 mss

0 kilometer 2



0 kilometer 2

Min, ML, Max Closures

05-mym utp geophysics int reservoir mapping method #1

Documents