Compression deformation test and rupture mode study of the marine shales from Wufeng-Longmaxi Formations in the southern margin of Sichuan Basin

doi:10.7523/j.issn.2095-6134.2018.04.020

Abstract

Abstract: The key to shale gas exploration and exploitation is to form a large-scale fracture network through fracturing technology. The technology is based on the friability evaluation of shale reservoirs, which is closely related to the rock mechanics and deformation characteristics. Based on the observation of the macro and micro characteristics of the marine shales from Wufeng-Longmaxi Formations in the southern margin of Sichuan Basin, we obtained its rock mechanical parameters through uniaxial compression deformation tests. By combining the stress-strain curves and analysis of rupture morphology, we obtain the results as follows. The shale shows relatively low compressive strength and Young's modulus, and has significant brittle characteristics. The shale has two rupture modes, single cant shear rupture and splitting rupture, which are decided by the bedding and loading directions. The mechanical properties and rupture modes of shale are influenced by many factors, among which the heterogeneity is the most important.

Key words: shale, compression deformation test, rock mechanical parameters, rupture mode, southern margin of Sichuan Basin

CLC Number:

P618.2

XU Tianyang, JU Yiwen, HUANG Cheng, QI Yu, ZHU Hongjian. Compression deformation test and rupture mode study of the marine shales from Wufeng-Longmaxi Formations in the southern margin of Sichuan Basin[J]. , 2018, 35(4): 561-568.

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