鄂尔多斯盆地南部泾河油田断裂发育特征及多期构造旋回演化

doi:10.3969/j.issn.1006-6535.2026.02.003

摘要/Abstract

摘要： 泾河油田位于鄂尔多斯盆地三大构造单元的交汇部位,经历多期构造活动,断裂发育极为复杂。为深入了解泾河油田断裂构造特征与演化过程对油气勘探的影响,在研究区三维地震资料精细构造解释的基础上,结合盆地构造演化特征及区域动力背景,系统研究了泾河油田的断裂构造类型、几何学特征、差异活动规律及成因演化。结果表明:研究区主要发育走滑断层和正断层,在断裂活动过程中存在明显的分层、分段差异性,由下至上发育下古生界的斜向伸展与右行走滑断裂体系、上古生界主断裂的弱继承性活动断裂体系及中生界的左行走滑反转断裂体系;泾河油田断裂发育经历了5个大的活动期次,主要活动时期为加里东期和燕山—喜山期,主要成藏期为早白垩世中晚期,二者具有较好的匹配关系;燕山运动使研究区走滑断裂再次活化,沟通长7段烃源岩与下伏长8段储层,对油气运聚成藏与差异富集具有重要意义。该研究可为泾河油田断裂体系的研究及勘探实践提供理论参考。

关键词: 走滑断裂, 构造特征, 成因演化, 泾河油田, 鄂尔多斯盆地

Abstract: Jinghe Oilfield is located at the junction of three major structural units of the Ordos Basin.It has undergone multiple phases of tectonic activity,resulting in extremely complex fault development.To better understand the fault structural characteristics and evolutionary processes in Jinghe Oilfield and their impact on hydrocarbon exploration,a systematic study was carried out based on detailed structural interpretation of 3D seismic data,integrated with the basin tectonic evolution characteristics and regional geodynamic setting.The fault types,geometric characteristics,differential activity patterns,and genetic evolution of faults in Jinghe Oilfield were comprehensively analyzed.The results show that the study area is mainly characterized by strike-slip faults and normal faults,with clear stratified and segmented differences in fault activity.From bottom to top,an oblique extensional and right-lateral strike-slip fault system has developed in the Lower Paleozoic;a fault system with weakly inherited activity along the main faults in the Upper Paleozoic;and a left-lateral strike-slip inversion fault system in the Mesozoic.The faults in Jinghe Oilfield have undergone five major phases of activity,with the primary active periods being the Caledonian and Yanshan-Himalayan orogenies.The main hydrocarbon accumulation period is the middle-late Early Cretaceous,which aligns well with these fault activities.The Yanshanian orogeny reactivated strike-slip faults in the study area,connecting the Chang 7 source rock interval with the underlying Chang 8 reservoir,which is of great significance for hydrocarbon migration,accumulation,and differential enrichment.This study provides theoretical reference for research on the fault system of Jinghe Oilfield and for guiding exploration practice.

Key words: strike-slip faults, structural characteristics, genetic evolution, Jinghe Oilfield, Ordos Basin

中图分类号:

TE121

祁晓龙, 唐大卿, 王玮龙, 雷涛, 贾会冲, 齐荣, 张威, 安川. 鄂尔多斯盆地南部泾河油田断裂发育特征及多期构造旋回演化[J]. 特种油气藏, 2026, 33(2): 23-33.

QI Xiaolong, TANG Daqing, WANG Weilong, LEI Tao, JIA Huichong, QI Rong, ZHANG Wei, AN Chuan. Fault development characteristics and multi-phase tectonic cycle evolution of Jinghe Oilfield,southern Ordos Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(2): 23-33.

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