Rock Mechanical Properties and Energy Evolution of Continental Shale Reservoirs

doi:10.7657/XJPG20230412

Abstract

Abstract:

The continental shale reservoirs in the Lucaogou formation of the Jimsar sag in the Junggar basin are lithologically composed of dolomite, argillaceous dolomite, dolomitic mudstone, dolomitic siltstone, and siltstone. The mechanical properties and energy evolution of the continental shale were investigated through laboratory mechanical experiments. The results show that there are significant differences in the rock mechanical properties of different lithologies within the shale reservoir. The compressive strengths of dolomite, dolomitic siltstone, siltstone, argillaceous dolomite and dolomitic mudstone are 112.09 MPa, 98.20 MPa, 85.98 MPa, 81.28 MPa and 58.30 MPa, respectively. With the increase of confining pressure, the brittleness of the rock samples of the continental shale reservoirs decreases and the ductility increases. The rock samples with different lithologies have different energy levels at the peak strength, indicating strong heterogeneity. Furthermore, the total energy, elastic energy and dissipated energy of the rocks with same lithologies under triaxial compression are higher than those under uniaxial compression.

Key words: Junggar basin, Jimsar sag, Lucaogou formation, continental shale, reservoir, rock mechanical property, energy evolution, failure mode

CLC Number:

TE21

GAN Renzhong, XIONG Jian, PENG Miao, LIU Xiangjun, LIANG Lixi, DING Yi. Rock Mechanical Properties and Energy Evolution of Continental Shale Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(4): 472-478.

Figures/Tables 5

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Table 1.

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