ORIGINAL GAS IN PLACE: ABNORMALY PRESSURED GAS RESERVOIR
OGIP for Overpressured & Compressible Reservoir
INPUT DATA
Title
#
Cumulative gas
produced
Reservoir
pressure
Z
Y{P/Z}
(MMscf)
(psi)
(psi)
1
0
1.33
0.0
2
1.323
42.0
3
1.277
334.5
4
1.198
857.5
5
1.148
1206.2
6
1.084
1695.0
7
1.037
2078.5
8
0.984
2584.2
9
0.94
3108.1
10
11
12
13
14
15
16
17
18
19
20
Reservoir temperature
°F
Abandonment pressure
psi
Aquifer-to-reservoir size ratio
(reservoir size = 1)
Rock compressibility
10
-6
psi
-1
Water compressibility
10
-6
psi
-1
Shale bulk compressibility
10
-6
psi
-1
Shale fraction
fraction
Reservoir porosity
fraction
Interstitial water saturation
fraction
Gas gravity
(air=1)
RESULTS & GRAPH
DETERMINATION OF OGIP FOR GEOPRESSURED RESERVOIR
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