Genesis and Coupling Relationship of Fractures in Shale Reservoir of Lucaogou Formation in Jimsar Sag, Junggar Basin

doi:10.7657/XJPG20210502

Abstract

Abstract:

According to the data of outcrops, cores and thin sections of the shale reservoir of the Lucaogou formation in the Jimsar sag, Junggar basin, and considering the imaging logging data, physical simulation of oil and gas migration and triaxial rock fracturing experiment etc., we studied the genesis and coupling relationship of fractures in the shale reservoir in micro and macro scales based on the stress-strain curve. The results show that: (1) The mutual coupling of bedding fractures and structural fractures can greatly improve the physical properties of the shale reservoir; (2) Bedding fractures and structural fractures are influenced by each other during their devlopment. When the rock with bedding fractures is compressed in the direction vertical to the bedding plane, multi-stage fractures are likely to appear and form a fracture system with interlaced bedding fractures and structural fractures; when the rock is compressed in the direction parallel to the bedding plane, a fracture system with less stages may occur, which is mainly composed of bedding fractures; (3) The parallel coupling of structural fractures and bedding fractures has no significant impact on the permeability of the shale reservoir, while their vertical coupling can significantly increase the permeability of the shale reservoir.

Key words: Junggar basin, Jimsar sag, Lucaogou formation, shale reservoir, bedding fracture, structural fracture, fracture genesis, coupling

CLC Number:

TE122.2

LIANG Chenggang, XIE Jianyong, CHEN Yiwei, LIU Juanli, HE Yongqing, ZHAO Jun, WANG Wei, WANG Liangzhe. Genesis and Coupling Relationship of Fractures in Shale Reservoir of Lucaogou Formation in Jimsar Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(5): 521-528.

Figures/Tables 9

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Table 1

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