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Characteristics of hydrocarbon accumulation in the Paleozoic Donghetang Formation in the Southwestern Tahe Area

Acta Geologica Sinica(English Edition) 2011年第4期85卷 899-910页

作者： ZHOU Wen ZHAO Guanjun LIU Fei YE Bin LI Xiuhua HUANG Tingting ZHOU Qiumei DONG Guoliang State Key Laboratory of Petroleum Reservoir Geology and Reservoir Engineering Chengdu University of TechnologyChengduSichuan 610059China Drilling and Oil Recovery Research Institute Sichuan Petroleum Administrator BureauGuanghan Sichuan 618300China

The ancient structure characteristic,correlation of the oil and the hydrocarbon source rock characteristics,hydrocarbon migration trace,types and conditions of traps,migration passages and characteristic of hydrocarbon accumulation are researched in this *** is shown through the analysis that two main large tectonic activities after the Early Hercynian orogeny resulted in different tectonic patterns in the study *** main hydrocarbon infills occurred in the Donghetang Formation,the first occurred in the Early Hercynian resulting in the ancient hydrocarbon accumulation in the northern Tahe,the second infill was a large amount that occurred in places beneficial for hydrocarbon accumulation,such as structural traps and structural-stratigraphic traps formed in the Early Himalayan orogeny after migration along the faults through source rocks and other *** the earlier period of the Himalayan orogeny,the petroleum mainly migrated to the north,whereas petroleum migrated to the south and southeast because of the structural reverse in the Himalayan orogeny,so the middle and later period of the Himalayan orogeny is the key period for hydrocarbon *** model of＂oil generation formed early,hydrocarbon accumulation controlled by the faults through source rocks and structures formed late＂is *** is pointed out that the south of the research area is currently the beneficial district for hydrocarbon accumulation, which provides the basis for future petroleum exploration.

关键词： southwestern Tahe faults cutting through hydrocarbon source rock hydrocarbon igration trace model of hydrocarbon accumulation

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