Fluid Inclusions and Gas Accumulation of Permian in Eastern Ordos Basin

Abstract

Abstract: The gas accumulation time and process of the Permian (including Taiyuan, Shanxi, Shihezi and Shiqianfeng formations) gas reservoirs in eastern Ordos basin were described by reservoir fluid inclusions. The result shows that the Upper Paleozoic reservoirs are rich in type of fluid inclusions, mainly including saltwater inclusion, hydrocarbon-bearing inclusion and gaseous hydrocarbon inclusion. The distributions of homogenization temperature of the fluid inclusions in different gas strata are of significant differences with single frequency, dual-frequency or multi-frequency. The reservoir fluid was characterized by high salinity. Integrated with the burial history and thermal history analyses, the effective gas accumulation times of Taiyuan, Shanxi, Lower Shihezi and Upper Shihezi-Shiqianfeng gas strata were determined. The gas accumulation process of the Permian gas reservoir groups could be divided into two stages: the early durative stage from Jurassic to Early Cretaceous, in which the primary gas reservoirs of Taiyuan and Shanxi formations were formed with "diffused gas pool" in Lower Shihezi Formation; the late lifting and adjustment stage of Late Cretaceous, in which natural gas was quickly adjusted by way of bunched flow, with connections among micro-fractures and faults, and Lower Shihezi gas reservoir and Upper Shihezi- Shiqianfeng secondary gas pool were formed.

Key words: Ordos basin, Permian, fluid inclusion, gas accumulation time, gas accumulation process

CLC Number:

TE112.1

LI Yan-xia, ZHAO Jing-zhou, LI Jing-hong. Fluid Inclusions and Gas Accumulation of Permian in Eastern Ordos Basin[J]. Xinjiang Petroleum Geology, 2011, 32(5): 451-456.

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