渤海湾盆地新生代晚期断层活动与新近系油气富集关系

doi:10.11743/ogg20150401

Abstract

Abstract:

Neogene-Quaternay faulting activities and their influence upon hydrocarbon accumulations in Bohai Bay Basin were analyzed based on hydrocarbon distribution characteristics and geological settings.It shows that the late faulting activity influenced the macroscopic distribution of the hydrocarbon accumulation assemblage and controlled the Neogene oil and gas enriched types and enriched belts of different depressions.Effect of faults different activity on hydrocarbon accumulation can be characterizedby fault activity difference coefficient(FDC).When the early and mid-generation and expulsion of hydrocarbon, the fault activity is strong and when late generation and expulsion of hydrocarbon the fault activity is weak, that is most favorable for hydrocarbon accumulation.Based on fault activity rate and FDC, we categorized the faults into Ⅰ, Ⅱ and Ⅲ kinds in terms of their controlling ability on oil and gas accumulation.The first two types with faster fault activity rate and larger FDCs, were distributed in places where oil and gas are highly enriched in the Neogene and the last type with slower fault activity rate and small FDC was in places where oil and gas enrichment is poor in the Neogene.Based on the understanding, we propose that differences in faulting activities controlled oil and gas accumulations and the types of faults determined the level of oil and gas enrichment.

Key words: faulting activity, oil source fault, hydrocarbon accumulation, Neogene, Bohai Bay Basin

CLC Number:

TE122.1

Jiang Youlu, Liu Pei, Song Guoqi, Liu Hua, Wang Yongshi, Zhao Kai. Late Cenozoic Faulting activities and their influence upon hydrocarbon accumulations in the Neogene in Bohai Bay Basin[J]. Oil & Gas Geology, 2015, 36(4): 525-533.

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Late Cenozoic Faulting activities and their influence upon hydrocarbon accumulations in the Neogene in Bohai Bay Basin

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