松辽盆地北部深层致密火山岩气藏天然裂缝分布特征及控制因素

doi:10.11743/ogg20200307

Abstract

Abstract: The natural fracture system controls the hydrocarbon migration,accumulation and enrichment in the tight volcanic reservoirs,Northern Songliao Basin.It is of fundamental significance to illuminating the factors controlling natural fracture development in tight volcanic reservoirs for an accurate prediction of fracture distribution pattern.Using data from outcrop,core and thin section observation,as well as fracture interpretation with image logging,we finely characterize the development features of natural fractures in the tight volcanic reservoirs of the study area,and make a systematic research on the fracture distribution and its controlling factors.The results show that the fractures developed therein can be grouped into two types,including primary and secondary fractures.Among others,the secondary tectonic fractures are dominant,with a linear density ranging from 1.0 m^-1 to 5.0 m^-1,averaging at 2.45 m^-1.The fracture intensity varies greatly,mainly controlled by rock type,mechanical property,brittleness and tectonic position.The natural fracture orientation is complex and variable,a result of the combined action of paleotectonic stress,fault and rock heterogeneity (foliation).

Key words: natural fracture, fault, rock heterogeneity, volcanic rock, Songliao Basin

CLC Number:

TE121.1

Gao Shuai, Gong Lei, Liu Xiaobo, Liu Bo, Gao Ang, Su Xiaocen, Wang Jie, Li Jing. Distribution and controlling factors of natural fractures in deep tight volcanic gas reservoirs in Xujiaweizi area,Northern Songliao Basin[J]. Oil & Gas Geology, 2020, 41(3): 503-512.

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Distribution and controlling factors of natural fractures in deep tight volcanic gas reservoirs in Xujiaweizi area,Northern Songliao Basin

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