Index
233
tails. See distribution
temperature, 137, 140, 159
thermal alteration index, 157, 160
thermal dynamics, principle of, 159
thermal history of source beds and
rocks, 8, 143, 152–4, 158–9
time-dependent factors, 42
time isochrons, 138
time series, exploration, 18, 20,
143, 175
time windows, 81–6, 107, 115–16,
159–61
total organic carbon (TOC), 113–14,
156–7
transcendental equations,
asymmetrical and
symmetrical, 38
transgressive–regressive cycle, 109
transgressive/transgressive–regressive
hemicycle, 9–10
transportation center, distance to, 26
trap, 9, 19, 39, 43, 103, 112, 127
combined oil/gas, evaluating, 43,
158
fi ll, 124–5, 136–7, 147
identifi able, and number-ofprospects distribution, 127
nonproductive, 86–7
trapping mechanism, 7–8
truncation, economic, 87–8, 144,
167, 170
truncation of large values, 27
truncation phenomenon (difference
in cost/ price regimes), 167
Turner Valley pool (fl uctuation of
booked resources), 81–2
unbiased estimator, 165
uncertainty, 11, 25, 52–3, 55, 60,
77, 80, 108, 132, 163
in estimations (overlapping
phenomenon), 55
inherited, 60, 132
measuring, 163
of play resource distribution, 132
in prediction intervals, 60
reduction of, 77, 80, 132
unconformity, regional, 88
Upper Mannville Sandstone play, 21
U.S. Geological Survey (USGS), 3
USGS log-geometric discovery process
method, 153, 161–2, 166–8
variable. See random variable
variance. See also mean and variance
addition or subtraction from
pool-size distribution, 122
affected by range of values in
geological random variable, 137
inadequate estimate with truncated
data, 27
large, in population containing one
or more outliers, 21
and larger vs. smaller pool
size, 136
of pool-size distribution, over- or
underestimated, 121
of population, underestimated by
sample variance, 16
and uncertainty in play resource
distribution, 131–2
Viking sandstone play, 21
volumetric yield (analogous basin
method), 152–3
water depth, 18–19, 40, 107
water level, rising, 18
water saturation, 45, 103, 121–2, 137,
140, 147
Waterways Formation, 18
Watt Mountain regression, 10
wedge, facies-cycle, 109
White’s ideal, 109–10
Weibull distribution, 18, 23, 34, 61–2,
88, 91–2, 94–9, 102, 105
population, 23, 25, 61–4, 66–7,
69–72, 74–6, 79
probability density function,
defi ned, 62
well/wells, 3, 19, 114, 140, 144, 164
calculating number required for
developing undiscovered
pool, 136
data, 112, 114, 140, 143
for basin or subsurface
study, 140, 143
exploratory and development, 31,
114–15
development, 3
elevation, 140
exploratory, 3, 19–20, 114, 143–4,
163, 169
cumulative number, probability
of success (creaming
method), 169
history, 164
log, mechanical, 112, 140
tested, identifying geological
factors, 112
wildcat, 19, 85, 161, 169–70
233
tails. See distribution
temperature, 137, 140, 159
thermal alteration index, 157, 160
thermal dynamics, principle of, 159
thermal history of source beds and
rocks, 8, 143, 152–4, 158–9
time-dependent factors, 42
time isochrons, 138
time series, exploration, 18, 20,
143, 175
time windows, 81–6, 107, 115–16,
159–61
total organic carbon (TOC), 113–14,
156–7
transcendental equations,
asymmetrical and
symmetrical, 38
transgressive–regressive cycle, 109
transgressive/transgressive–regressive
hemicycle, 9–10
transportation center, distance to, 26
trap, 9, 19, 39, 43, 103, 112, 127
combined oil/gas, evaluating, 43,
158
fi ll, 124–5, 136–7, 147
identifi able, and number-ofprospects distribution, 127
nonproductive, 86–7
trapping mechanism, 7–8
truncation, economic, 87–8, 144,
167, 170
truncation of large values, 27
truncation phenomenon (difference
in cost/ price regimes), 167
Turner Valley pool (fl uctuation of
booked resources), 81–2
unbiased estimator, 165
uncertainty, 11, 25, 52–3, 55, 60,
77, 80, 108, 132, 163
in estimations (overlapping
phenomenon), 55
inherited, 60, 132
measuring, 163
of play resource distribution, 132
in prediction intervals, 60
reduction of, 77, 80, 132
unconformity, regional, 88
Upper Mannville Sandstone play, 21
U.S. Geological Survey (USGS), 3
USGS log-geometric discovery process
method, 153, 161–2, 166–8
variable. See random variable
variance. See also mean and variance
addition or subtraction from
pool-size distribution, 122
affected by range of values in
geological random variable, 137
inadequate estimate with truncated
data, 27
large, in population containing one
or more outliers, 21
and larger vs. smaller pool
size, 136
of pool-size distribution, over- or
underestimated, 121
of population, underestimated by
sample variance, 16
and uncertainty in play resource
distribution, 131–2
Viking sandstone play, 21
volumetric yield (analogous basin
method), 152–3
water depth, 18–19, 40, 107
water level, rising, 18
water saturation, 45, 103, 121–2, 137,
140, 147
Waterways Formation, 18
Watt Mountain regression, 10
wedge, facies-cycle, 109
White’s ideal, 109–10
Weibull distribution, 18, 23, 34, 61–2,
88, 91–2, 94–9, 102, 105
population, 23, 25, 61–4, 66–7,
69–72, 74–6, 79
probability density function,
defi ned, 62
well/wells, 3, 19, 114, 140, 144, 164
calculating number required for
developing undiscovered
pool, 136
data, 112, 114, 140, 143
for basin or subsurface
study, 140, 143
exploratory and development, 31,
114–15
development, 3
elevation, 140
exploratory, 3, 19–20, 114, 143–4,
163, 169
cumulative number, probability
of success (creaming
method), 169
history, 164
log, mechanical, 112, 140
tested, identifying geological
factors, 112
wildcat, 19, 85, 161, 169–70