沉积盆地超压体系划分及其与油气运聚关系

doi:10.11743/ogg20040103

Abstract

Abstract:

Based on locations of source rock and key factors controlling genesis of overpressure systems,overpressure systems in sedimentary basins can be classified into deep overpressure system and shallow overpressure system.The former have mature to overmature source rocks,and overpressure is widely distributed,especially in Meso-Cenozoic basins;while the later lack of mature source rock,and the distribution of overpressure zone is generally limited in foreland basins,i.e.dual overpressure system occurs in foreland basins.Based on the analyses of generation and sealing of hydrocarbons in deep overpressure system,it is believed that hydrocarbon generation would be the primary factor controlling overpressure systems,while others are only secondary factors that further increase formation pressure.The upper overpressure system has been formed as the result of late tectonic compression on the basis of early normal pressure reservoirs.Correct discrimination of the two types of overpressure systems is essential to the study of hydrocarbon generation,migration and accumulation.Deep overpressure system is especially important to petroleum exploration, as it is the"chemical reaction furnace"of hydrocarbon generation,provides the original power for hydrocarbon migration,and determines the phase state and mode of migration and characteristics of accumulation.Generally,hydrocarbons would be difficult to accumulate in deep overpressure system.However,hydrocarbon accumulations can be formed in overpressure system when the original balance of temperature and pressure is broken due to structural uplifting or faulting.

Key words: deep overpressure system, upper overpressure system, seal, source rock, tectonic compression, hydrocarbon migration and accumulation

CLC Number:

TE112.12

Sun Dongsheng, Jin Zhijun, L? Xiuxiang, Yang Minghui, Zhou Xinyuan. Classification of overpressure systems in sedimentary basins and their relationship with hydrocarbon migration and accumulation[J]. Oil & Gas Geology, 2004, 25(1): 14-20,38.

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Classification of overpressure systems in sedimentary basins and their relationship with hydrocarbon migration and accumulation

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