COALBED METHANE: ORIGINAL GAS IN PLACE BY MODIFIED P/Z* METHOD
CBM: OGIP By Modified P/Z* Method
INPUT DATA
Title
#
Cumulative gas
produced
Reservoir
pressure
Z
Z
*
P/Z
*
(MMscf)
(psi)
(psi)
1
0
0.867
0.0517
29030.3
2
0.878
0.0466
28210.2
3
0.9
0.0385
26489.6
4
0.917
0.0328
24795.2
5
0.931
0.0287
23160.8
6
0.94
0.0261
21875.7
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Reservoir temperature
°F
Abandonment pressure
psi
Langmuir pressure constant
psi
Langmuir volume constant
scf/ton
Mass fraction ash
fraction
Bulk coalbed density
gm/cc
Reservoir porosity
fraction
Interstitial water saturation
fraction
Gas gravity
(air=1)
Average thickness
ft.
RESULTS & GRAPH
DETERMINATION OF OGIP FOR A COALBED METHANE RESERVOIR
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