Study on the rock mechanical properties of Jurassic terrestrial reservoirs: a case study of the lower sub-section of the second section in Lianggaoshan Formation of the eastern Sichuan Basin

ZhuYu ZHAO, ChuanLiang YAN, YuanFang CHENG, ZhongYing HAN, JinChun XUE

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 266-275.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 266-275. DOI: 10.6038/pg2025HH0493

Study on the rock mechanical properties of Jurassic terrestrial reservoirs: a case study of the lower sub-section of the second section in Lianggaoshan Formation of the eastern Sichuan Basin

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Abstract

Triaxial compression tests of terrestrial reservoir rocks were carried out with the reservoir rocks of the Lianggaoshan Formation in the eastern Sichuan Basin as the research object. The mechanical properties, damage modes, and energy evolution laws of sandstone and shale were investigated, while the morphological characteristics of the distribution of cracks in the reservoir rocks were determined based on the fractal theory. The results show that the average values of sandstone and shale compressive strength are 293.74 MPa and 140.48 MPa respectively in the range of the studied depth. Sandstone has strong hard and brittle characteristics, showing cross-shear expansion damage mode; shale damage mode is splitting damage. The fracture distribution pattern after rock damage possesses statistical self-similarity. The shale fractal dimension is large, the complexity of the fracture network is high, and the factorability is good. In addition, the energy is mainly dissipated by energy storage and internal crack extension before the ultimate elastic energy, and the instantaneous release of stress-driven elastic energy produces macroscopic damage after the ultimate elastic energy. The results of the study can provide an understanding and theoretical reference for the development of reservoirs in terms of mechanical properties and energy evolution.

Key words

Lianggaoshan Formation / Rock mechanics / Failure mode / Fractal theory / Energy evolution

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ZhuYu ZHAO , ChuanLiang YAN , YuanFang CHENG , et al . Study on the rock mechanical properties of Jurassic terrestrial reservoirs: a case study of the lower sub-section of the second section in Lianggaoshan Formation of the eastern Sichuan Basin[J]. Progress in Geophysics. 2025, 40(1): 266-275 https://doi.org/10.6038/pg2025HH0493

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