Development Characteristics of Shale Fractures in Longmaxi Formation of Changning Anticline and the Stage Analysis

doi:10.3969/j.issn.1006-6535.2021.01.008

Abstract

Abstract: Fracture characteristics and formation stages are of great significance for the optimization of shale gas favorable area. For example, we researched the fracture development characteristics and stages of Longmaxi Formation of Changning Anticline in southern Sichuan based on the observation and analysis of outcrop fractures in the field by means of tectonic analysis and tectonic inversion. Results show that the Changning Anticline is dominated by plane shear fractures and sectional shear fractures with high development degree, large dip angle and high filling degree. In this area, fractures in Longmaxi Formation can be divided into 3 types that are formed in 3 stages of tectonic movement. The first type is NNW and NE plane shear fractures and near-EW sectional shear fractures, formed in middle and late stages of Yanshan Movement and fully filled by calcite; the second type is NW and near EW plane shear fractures and NE sectional shear fractures, formed in the final stage of Yanshan Movement-early stage of Himalayan Movement with fracture fillers including calcite and a small amount of clay and pyrite, the third type is near SN and NEE plane shear fractures and NW sectional shear fractures, formed in middle stage of Himalayan Movement-now with a low fracture filling degree and fracture fillers of small amount of calcite. The research results provide some theoretical references for further exploration and development.

Key words: shale, fracture, tectonic stages, tectonic evolution, Changning Anticline, Longmaxi Formation

CLC Number:

TE133

Wan Yuanfei, Qin Qirong, Fan Yu, Wu Jianfa, Zhao Shengxian, Ji Chunhai, Fan Cunhui. Development Characteristics of Shale Fractures in Longmaxi Formation of Changning Anticline and the Stage Analysis[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 59-66.

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