鄂尔多斯盆地上古生界异常低压分布特征及形成过程

doi:10.11743/ogg20050617

Abstract

Abstract:

In Ordos basin,abnormally low and low pressures are common,while high pressure is rare in Upper Paleozoic.Laterally,the Upper Paleozoic in Suligemiao area displays abnormally low and low pressures,while that in Mizhi area dispalys normal and high pressures,and the other areas mainly display normal pressure and low pressure.Vertically,pressure of acquifers basically distribute along the trend line of hydrostatic pressure;while that of gas-bearing acquifers and gas-bearing formations deviate from the trend line of hydrostatic pressure,the latter has larger extent of deviation than the former,and the pressure coefficient decreases with increasing depth.Both the test data of inclusions and the burial-denudation data of the basin indicate that the Upper Paeozoic gas pools with abnormally low pressure in Ordos basin would have been formed in two stages: gas charging and pressurizing from Late Jurassic to Early Cretaceous,and gas-dispersion,temperature lowering and depressurizing stage from the end of Early Cretaceous up to present time.The depressurization of gas pool would have mainly resulted from basin uplift,temperature lowering,gas dispersion and density contrast of gas and water.

Key words: abnormally low pressure, Upper Paleozoic, Ordos basin

CLC Number:

TE112.1

Yuan Jihua, Liu Guangdi. Distribution characteristics and formation process of Upper Paleozoic abnormally low pressure zones in Ordos basin[J]. Oil & Gas Geology, 2005, 26(6): 792-799.

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Distribution characteristics and formation process of Upper Paleozoic abnormally low pressure zones in Ordos basin

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