柴达木盆地应力场特征与油气运聚关系

doi:10.11743/ogg20050519

Abstract

Abstract:

Qaidam basin has experienced four major tectonic movements since Early Jurassic,including late Himalayan stage(end of Middle Pleistocene),middle Himalayan stage(end of upper Youshashanian),late Yan-shanian stage(end of Cretaceous) and early Yanshanian stage(end of middle Jurassic).The maximum principal stress values during the 4 major stages measured with acoustic emission(AE) method are 35.6～41.4,54.8～62.8,73.8 and 58.3 MPa,respectively.The current effective value of principal compressive stress is in the range of 15.6～112.3 MPa.The effective value of principal compressive stress during the main reservoiring stages of Tertiary oil and gas is in the range of 54.8～62.8 MPa.The sealing history of the NWW fault in western Qaidam basin is studied through simulating the stress fields during the major reservoiring stages and analyzing the typical oil and gas reservoirs in this area.It is found that the NWW reverse fault had dual effects on hydrocarbon migration and accumulation in late Miocene.It acted as hydrocarbon migration pathway during the active stage,and acted as seal during the ceasing stage,making hydrocarbons to accumulate both in the hanging wall and footwall of the fault.Hydrocarbons have accumulated mainly in the areas with moderate shearing stress.

Key words: Qaidam basin, stress field, numerical simulation, hydrocarbon migration, fault sealing ability

CLC Number:

TE112.1

Zhang Mingli, Jin Zhijun, Wan Tianfeng, Tang Liangjie, Li Jingchang, Zeng Lianbo. A discussion on relationship between tectonic stress field and migration and accumulation of hydrocarbons in Qaidam basin[J]. Oil & Gas Geology, 2005, 26(5): 674-679.

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A discussion on relationship between tectonic stress field and migration and accumulation of hydrocarbons in Qaidam basin

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