The Geomechanical Characteristics of the Continental Shale Reservoirs and Their Influence on the Fracturing Effect

doi:10.11885/j.issn.1674-5086.2021.12.28.01

Abstract

Abstract: According to the reservoir logging data and the post-fracturing oil test data, the reservoir geomechanical characteristics of the Fengcheng Formation continental shale reservoirs in the Mahu Sag, Junggar Basin were analyzed, and the main geomechanical factors affecting the fracturing effect were determined by the grey correlation method. Based on this, the fracturing evaluation index of Fengcheng Formation continental shale reservoirs was constructed by analytic hierarchy process. The results show that the relationships between rock mechanical parameters, acoustic wave and bulk density of Fengcheng Formation continental shale reservoirs are clarified, and the response mechanisms of rock mechanical parameters of continental shale reservoirs in the study area is revealed, so as to establish the calculation models of the reservoir rock mechanical parameters. Based on the drilling fracturing and logging data, the calculation models of formation pressure and in-situ stress of continental shale reservoirs in the study area is established. The main geomechanical factors affecting the fracturing effect of the reservoirs are determined with the grey correlation method, namely, elastic modulus, horizontal stress difference, minimum horizontal principal stress, tensile strength and uniaxial compressive strength. The fracturing evaluation index of the continental shale reservoirs in the study area is constructed by using analytic hierarchy process. The weight coefficients of the main geomechanical control factors are 0.369 6, 0.244 0, 0.209 0, 0.109 3 and 0.068 1.

Key words: Mahu Sag, continental shale, geomechanical factor, in-situ stress, fracability evaluation index

CLC Number:

TE132

XIONG Jian, WU Jun, LIU Xiangjun, ZHANG Lei, LIANG Lixi. The Geomechanical Characteristics of the Continental Shale Reservoirs and Their Influence on the Fracturing Effect[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 69-80.

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