Determination of paleo-pressure for a natural gas pool formation based on PVT characteristics of fluid inclusions in reservoir rocks |
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Authors: | Email author" target="_blank">Jingkui?MiEmail author Xianming?Xiao Dehan?Liu Jiagui?Shen |
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Institution: | 1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangz,China;2.Institute of Sedimentary Mineral and Resources, Department of Civil Engineering,Xiangtan Polytechnic University,Xiangtan,China |
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Abstract: | It has been proved to be a difficult problem to determine directly trapping pressure of fluid inclusions. Recently, PVT simulation
softwares have been applied to simulating the trapping pressure of petroleum inclusions in reservoir rocks, but the reported
methods have many limita-tions in practice. In this paper, a method is suggested to calculating the trapping pressure and
temperature of fluid inclusions by combining the isochore equations of a gas-bearing aqueous inclusion with its coeval petroleum
inclusions. A case study was conducted by this method for fluid inclusions occurring in the Upper-Paleozoic Shanxi Formation
reservoir sandstones from the Ordos Basin. The results show that the trapping pressure of these inclusions ranges from 21
to 32 MPa, which is 6–7 MPa higher than their minimum trapping pressure although the trapping temperature is only 2–3°C higher
than the homogenization temperature. The trapping pressure and temperature of the fluid inclusions decrease from southern
area to northern area of the basin. The trapping pressure is obviously lower than the state water pressures when the inclusions
formed. These data are consistent with the regional geological and geochemical conditions of the basin when the deep basin
gas trap formed. |
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