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- W2371517165 abstract "Through the study of compaction character and pressure genesis of sandstone and mudstone in the Ordos basin,combined with the research of association relation of different lithology,it is considered that there exist obvious differences in the stratum pressure genesis between the hydrocarbon rock and non-hydrocarbon rock,sandstone and mudstone.The abnormal high pressure in the mudstone of non-hydrocarbon rock is resulted from the heterogeneous compaction and the gas formation is the key factor for the increment of pressure in the hydrocarbon rock as well as the dynamic source for the migration and accumulation of natural gas in the upper Paleozoic stratum.Tectonic uprising and erosion become the major mechanism for the pressure decrease in the sandstone,but has little effect on the mudstone because their elasticity nd plasticity are apparently different.At present,the non-hydrocarbon rocks of the Shiqianfeng Formation and Shihezi Formation possesses heterogeneous compaction and show high-pressure abnormality.The reservoir in the stratum shows low-normal pressure,indicting that low and high pressures coexist in the complicated pressure system in the upper Paleozoic stratum.The formation and evolution of pressure space in the upper Paleozoic reveals that it is not suitable to use the flow potential in the study of regional migration among unconnected sandbodies.According to the Berg formula,at least 22.07 m~67.36 m gas columns is needed to initiate the migration of gas,which is much thicker than the thickness of individual sandstone bed in the upper Paleozoic reservoir.On the basis of production capcity,gas accumulation and gas pool formation,only when the average pressure of Shan 2 Member is less than 6.22 MPa and the thickness of sandstone is over 4 m,can it possess the conditions of gas accumulation and gas pool formation.On the contrary,it is difficult for the sandstones with large driving pressure,poorly developed pore texture and small thickness to form large-scale gas reservoir." @default.
- W2371517165 created "2016-06-24" @default.
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- W2371517165 date "2007-01-01" @default.
- W2371517165 modified "2023-09-28" @default.
- W2371517165 title "SOME PROBLEMS IN THE RESEARCH OF LOW PRES-SURE ANOMALY IN THE UPPER PALEOZOIC STRATUM IN THE ORDOS BASIN" @default.
- W2371517165 hasPublicationYear "2007" @default.
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