准南前陆冲断带下组合泥岩盖层封盖能力

doi:10.7657/XJPG20200112

摘要/Abstract

摘要：

准噶尔盆地南缘前陆冲断带下组合白垩系和侏罗系泥岩盖层区域上分布稳定,排替压力高,且普遍发育流体异常高压,具备很强的封盖能力,但前陆冲断带晚期强烈构造挤压对盖层封盖能力的破坏不容忽视。泥岩三轴挤压物理模拟实验和数值模拟结果表明,深部厚层均质泥岩抗压强度高、封盖能力强;挤压作用下不同倾角泥岩层具有塑性、脆性和脆性—塑性周期性变化3种变形方式。结合准南前陆冲断带下组合泥岩层的地质条件和实例解剖,将准南前陆冲断带泥岩盖层划分为4个区域,不同区域泥岩盖层封盖能力动态演化控制了准南前陆冲断带油气成藏特征及油气分布规律。

关键词: 准噶尔盆地, 前陆冲断带, 泥岩盖层, 封盖能力, 构造挤压, 脆性, 塑性

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

中图分类号:

TE112.3

卓勤功, 雷永良, 边永国, 陈竹新, 胡瀚文. 准南前陆冲断带下组合泥岩盖层封盖能力[J]. 新疆石油地质, 2020, 41(1): 100-107.

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.

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