Mudstone Caprock Sealing Capacity of the Lower Reservoir-Forming Combination in the Foreland Thrust Belt of the Southern Margin, Junggar Basin

doi:10.7657/XJPG20200112

Abstract

Abstract:

Cretaceous and Jurassic mudstone caprocks of the lower reservoir-forming combination are widely distributed in the foreland thrust belt of the southern margin of Junggar basin, which are featured with high displacement pressure and very strong sealing capacity. However, the destruction of the strong tectonic compression to caprock sealing capacity at the late stage can not be ignored. The results of physical simulation and numerical simulation of triaxial compression of the mudstone show that the thick and homogeneous mudstone in the deep strata has high compressive strength and strong sealing capacity. Under the compression, the mudstone layers with different dip angles have three deformation modes such as plasticity, brittleness and periodic brittleness-plasticity alternation. According to the actual geological conditions and case analysis of the mudstone in the lower reservoir-forming combination, the mudstone caprock in the foreland thrust belt of the southern margin of Junggar basin is divided into four districts, and the dynamic evolution of the sealing capacity of the mudstone caprocks in different districts controls the hydrocarbon accumulation and distribution in the foreland thrust belt.

Key words: Junggar basin, foreland thrust belt, mudstone caprock, sealing capacity, tectonic compression, brittleness, plasticity

CLC Number:

TE112.3

ZHUO Qingong, LEI Yongliang, BIAN Yongguo, CHEN Zhuxin, HU Hanwen. Mudstone Caprock Sealing Capacity of the Lower Reservoir-Forming Combination in the Foreland Thrust Belt of the Southern Margin, Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 100-107.

Figures/Tables 6

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