Study on the rock mechanical properties and anisotropy of Paleocene Huxiang reservoirs: a case study of the Shahejie Formation in the southeastern Bohai Bay Basin

ZhuYu ZHAO, ChuanLiang YAN, JinChun XUE, YuanFang CHENG, ZhongYing HAN, Zhe ZHANG, Bo SUN, GuangXu ZHOU

Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 806-816.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 806-816. DOI: 10.6038/pg2025II0025

Study on the rock mechanical properties and anisotropy of Paleocene Huxiang reservoirs: a case study of the Shahejie Formation in the southeastern Bohai Bay Basin

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Abstract

The Shahejie Formation is endowed with high-quality hydrocarbon source rocks which is an important rocky oil and gas reservoir in Bohai Bay Basin. Rock mechanics, which is an important geomechanically property of reservoirs, holds great significance in accurately evaluating the drilling and completion process and fracturing construction design. In this paper, typical shales, sandstones, and mudstones of the Shahejie Formation are taken as the research objects, and thin-section appraisal and triaxial compression tests are carried out to clarify the petrographic and mechanical properties and the damage modes of the reservoirs. The influence of confining pressure and laminar orientation on rock strength anisotropy and damage characteristics is analyzed. The results show that: The rocks of different lithological reservoirs show different mechanical properties. Sandstone has high compressive strength and modulus of elasticity, strong hard brittleness characteristics, and mainly undergoes shear damage. The second is shale, which is controlled by the influence of laminar orientation with significant anisotropy in mechanical strength and fracture pattern, and good fracturability. Mudstone is the least mechanically stable. Layer orientation has a significant effect on the anisotropy of reservoir compressive strength. The mechanical strength of the rock is most stable when the dip angle of the laminae is 0°, followed by 90°. The compressive strength and modulus of elasticity of the rock are the lowest when the dip angle of the laminae is 60°. The modified Gaussian model can effectively characterize the changing trend of compressive strength with laminar inclination angle β. The orientation of the laminae affects the compressive fracture pattern of shale. When the orientation of the laminae is 0°, the damage mode is a composite damage controlled by tension through the laminae and shear along the laminae surface. At 30° and 60°, the specimens showed shear damage. When the orientation of the laminae is 90°, the specimens are characterized by tensile splitting damage across the end face. Both sandstone and mudstone show shear damage mode. The research results can provide theoretical support to the evaluation of reservoir rock mechanics and highly efficient exploration and development of oil and gas.

Key words

Shahejie Formation / Rock mechanics / Anisotropy / Layer orientation / Damage mode

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ZhuYu ZHAO , ChuanLiang YAN , JinChun XUE , et al . Study on the rock mechanical properties and anisotropy of Paleocene Huxiang reservoirs: a case study of the Shahejie Formation in the southeastern Bohai Bay Basin[J]. Progress in Geophysics. 2025, 40(2): 806-816 https://doi.org/10.6038/pg2025II0025

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