GEOL 4143
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Quiz #7
What is the best reservoir drive mechanism? Water drive
A lead is a potential accumulation but requires more evaluation.
Name three primary mechanism drives: pressure depletion, gas cap expansion, water drive
Known reserves (P1) are ) proven reserves
Give the complete oil volumetrics equation using American units (i.e. not metric):
Recoverable Reserves (BBLS) = 7758xAx h xOx(1-S*) x
RF
B"
6.
List the components of this equation and give their associated units:
Recoverable oil: amount of recoverable oil (BBIS)
7758: conversion factor (acre
ft x7758 = BBLS)
A: Area of accumulation (acres)
h: thickness of pay zone (feet)
O: porosity (decimal)
Sw: water satuation (decimal) [(l-Sw] = hydrocarbon saturationl
Bo: oil formation volume factor/shrinkage factor (reservoir bbl/stock tank bbl)
RF: recovery
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factor (decimal)
List the main differences between the oil and gas volumetrics equations:
The conversion factors (7,758 and 43,560)
The formation volume factors (Bo: reservoir bbl/stock tank bbl and Bg: reservoir cubic
feet/standard cubic feet)
8.
Volumetric analysis for reserve calculations typically the best evaluation method to use to
calculate reserves when there is no production history
9.
A project associated with a potential accumulation that is sufficiently well defined to represent
viable drilling target is a prospect.
a
10. Define 3P reserves: proved plus probable plus possible
11. Name one estimated recovery procedure: analogy, performance based estimates
12. Name the from Chip Taylor's presentation: A tandman atways words with a geologist
13. What are the two significant drilling and completion innovations? Horizontal drilling and
hydraulic fracing
Extra Credit: What is the difference between conventional and unconventional?
**Also a good idea to know the gas volumetrics equation:
Recoverable Gas (cubicftl = 43,560
xAx h xO x (1-S*l
x
RF
B,
OGIP: OriginalGas ln Place
A: Area (acres)
h: average thickness of pay zone (feet)
(D: porosity (decimal)
Sw: Water Saturation
(decima!)
[ (l-Sw] = hydrocarbon saturationl
Bg: Gas Formation Volume Factor/expansion factor (reservoir cubic
43.560: conversion factor (acre ft x 43,550 = cubic feet)
RF: Recovery Factor (decimal) [RCF=reservoir cubic
feetl
ft/standard cubic ft)