Oil & Gas Geology ›› 2019, Vol. 40 ›› Issue (2): 215-222.doi: 10.11743/ogg20190201

• Petroleum Geology • Previous Articles     Next Articles

Growth of strike-slip zone in the southern Bohai Bay Basin and its significances for hydrocarbon accumulation

Zhou Xinhuai1, Zhang Xintao1, Niu Chengmin1, Liu Hao2, Huang Jiangbo1   

  1. 1. CNOOC Tianjin Branch Company, Tianjin 300452, China;
    2. School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2017-09-13 Revised:2018-12-04 Online:2019-04-28 Published:2019-01-23

Abstract:

Tanlu strike-slip fault zone transverses the Huanghekou Sag and Laixi structural belt in the southern Bohai Bay Basin.We studied the characteristics and genetic mechanism of faults within the strike-slip zone,as well as its controlling effect on hydrocarbon accumulation,by using variance slicing,3D visualization and fine seismic interpretation technologies.The results show that there are two kinds of fault systems in the strike-slip fault zone in the southern Bohai Bay Basin:the "aerial ladder" type and the "palisade" type.The fault evolution has experienced three stages including sinistral strike-slip in the Mesozoic,extension-strike-slip in the Paleogene and intensive dextral strike-slip in the Neogene.The strike-slip belt not only controls the formation of traps,but also affects the distribution of sedimentary system in medium-to-deep layers as well as the horizons of hydrocarbon accumulation.According to the characteristics of hydrocarbon enrichment at different structural locations,four types of hydrocarbon accumulation patterns within the strike-slip belt were established,namely the transfer-station,meshwork-carpet,composite and ladder types,which have contributed to the successive discovery of large-or medium-sized oil and gas fields in recent years and will serve as a practical guidance for future hydrocarbon exploration.

Key words: accumulation pattern, strike-slip structural zone, Tanlu fault, Bohai Bay Basin

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