鄂尔多斯盆地盐池地区中生界断裂特征及其石油地质意义

doi:10.3969/j.issn.1672-7703.2022.05.008

摘要/Abstract

摘要： 断裂对鄂尔多斯盆地西北部盐池地区石油聚集具有重要控制作用，在区域地质资料分析的基础上，应用电子自旋共振（ESR）测年、方解石U—Pb同位素测年、平衡剖面恢复、构造物理模拟等技术，结合二维地震、三维地震解释结果，对中生界断裂发育特征及其与石油的关系进行了研究。分析结果认为：盐池地区发育3期断裂，印支期北西向断裂系统规模小，主体发育在三叠系延长组；燕山期近南北向断裂系统规模最大，断距大，平面和剖面展布特征复杂；喜马拉雅期北东东向断裂系统规模较大，发育时期晚，具有一定的走滑性质。各期次断裂分别受到北西向、近东西向和北东—南西向区域应力作用，燕山期近南北向断裂与西缘大断裂活动密切相关。印支期北西向断裂系统沟通烃源岩和储层，具有较好的运移和遮挡匹配条件，对油气藏形成最为有利。断裂在一定程度上改善了储层的物性，当油井与断裂距离较近时，在构造高部位的高渗储层更容易成藏且产量更高。

关键词: 断裂特征, 物理模拟, 石油地质意义, 盐池地区, 鄂尔多斯盆地

Abstract: Faults played an important role in controlling oil accumulation in Yanchi area in the northwestern Ordos Basin. Based on the analysis of the regional geological data and combined with 2D and 3D seismic interpretation results, characteristics of the Mesozoic faults and their relationship with oil reservoir are studied by using technologies such as electron spin resonance (ESR) dating, calcite U-Pb isotope dating,equilibrium section restoration, and tectonophysical simulation. The results show that three stages of faults were developed in Yanchi area. The NW trending fault system in the Indosinian had a small scale and was mainly developed in the Triassic Yanchang Formation; The nearly NS trending fault system in the Yanshanian had the largest scale, with large fault throw and complex lateral and vertical distribution patterns; The NEE trending fault system in the Himalayan had a relatively large scale, late development period, and strike slip feature to a certain extent.The three stages of faults were formed by the regional stress of NW, nearly E-W and NE-SW directions respectively, and the nearly S-N faults were closely related to the activities of the major faults in the western basin margin. The NW trending fault system in the Indosinian connected source rock to reservoir, which delivered good configuration between migration and sealing, showing the most favorable conditions for the accumulation of oil and gas reservoirs. In addition, faults supported to improve the reservoir physical properties to some extent. When the oil well is close to the fault, oil accumulates will be easily accumulated in high permeability reservoirs in the high structural parts and high-yield production will be achieved.

中图分类号:

TE111.2

邵晓州, 王苗苗, 齐亚林, 赵红格, 张晓磊, 孙勃, 刘永涛. 鄂尔多斯盆地盐池地区中生界断裂特征及其石油地质意义[J]. 中国石油勘探, 2022, 27(5): 83-95.

Shao Xiaozhou, Wang Miaomiao, Qi Yalin, Zhao Hongge, Zhang Xiaolei, Sun Bo, Liu Yongtao. Characteristics of the Mesozoic faults in Yanchi area and the petroleum geological significance, Ordos Basin[J]. China Petroleum Exploration, 2022, 27(5): 83-95.

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