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Basin-centered gas systems: examples (view source)
Revision as of 14:34, 17 November 2015
, 14:34, 17 November 2015no edit summary
* Environments of deposition: mainly fluvial dominated and, to a lesser degree, marginal marine deltaic and barrier bar
* Environments of deposition: mainly fluvial dominated and, to a lesser degree, marginal marine deltaic and barrier bar
* Reservoir pressure: overpressured, with gradients ranging from 0.5 to 0.9 psi/ft ([[:file:BasinCenteredGasFig7.jpg|Figure 4]], [[:file:BasinCenteredGasFig8.jpg|Figure 5]])<ref name=Lawetal_1979 /><ref name=Lawetal_1980 /><ref name=Mcpeek_1981 /><ref name=Davis_1984 /><ref name=Law_1984 /><ref name=Spencer_1987>Spencer, C. W., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0004/0350/0368.htm Hydrocarbon generation as a mechanism for overpressuring in Rocky Mountain region]: AAPG Bulletin, v. 71, p. 368-388.</ref><ref name=Spencer_1989b /><ref name=Surdametal_1997 />
* Reservoir pressure: overpressured, with gradients ranging from 0.5 to 0.9 psi/ft ([[:file:BasinCenteredGasFig7.jpg|Figure 4]], [[:file:BasinCenteredGasFig8.jpg|Figure 5]])<ref name=Lawetal_1979 /><ref name=Lawetal_1980 /><ref name=Mcpeek_1981 /><ref name=Davis_1984 /><ref name=Law_1984 /><ref name=Spencer_1987>Spencer, C. W., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0004/0350/0368.htm Hydrocarbon generation as a mechanism for overpressuring in Rocky Mountain region]: AAPG Bulletin, v. 71, p. 368-388.</ref><ref name=Spencer_1989b /><ref name=Surdametal_1997 />
* Seals: Regional seals are capillary pressure seals. Locally, structural and stratigraphic seals are important.
* Seals: Regional seals are [[capillary pressure]] seals. Locally, structural and stratigraphic seals are important.
* Gas accumulations: downdip from normally pressured, water-bearing reservoirs ([[:file:BasinCenteredGasFig2.jpg|Figure 6]]);<ref name=Law_1984 /><ref name=Spencer_1985>Spencer, C. W., 1985, Geologic aspects of tight gas reservoirs in the Rock Mountain region: Journal of Petroleum Geology, p. 1308-1314.</ref> lacks a downdip water contact.<ref name=Law_1984 /> The level of thermal maturity at top of accumulation ranges from 0.7 to 0.9% R<sub>o</sub><ref name=Law_1984 /> ([[:file:BasinCenteredGasFig7.jpg|Figure 4]], [[:file:BasinCenteredGasFig8.jpg|Figure 5]]), commonly 0.8% R<sub>o</sub>.<ref name=Law_1984 />
* Gas accumulations: downdip from normally pressured, water-bearing reservoirs ([[:file:BasinCenteredGasFig2.jpg|Figure 6]]);<ref name=Law_1984 /><ref name=Spencer_1985>Spencer, C. W., 1985, Geologic aspects of tight gas reservoirs in the Rock Mountain region: Journal of Petroleum Geology, p. 1308-1314.</ref> lacks a downdip water contact.<ref name=Law_1984 /> The level of thermal maturity at top of accumulation ranges from 0.7 to 0.9% R<sub>o</sub><ref name=Law_1984 /> ([[:file:BasinCenteredGasFig7.jpg|Figure 4]], [[:file:BasinCenteredGasFig8.jpg|Figure 5]]), commonly 0.8% R<sub>o</sub>.<ref name=Law_1984 />
* Depth to accumulation: ranges from 8000 to 11,500 ft (2438-3505 m)
* Depth to accumulation: ranges from 8000 to 11,500 ft (2438-3505 m)