鄂尔多斯盆地演武地区断裂特征及其对侏罗系油藏的影响

doi:10.7657/XJPG20250309

摘要/Abstract

摘要：

鄂尔多斯盆地天环坳陷南段发育多个侏罗系油藏群，展现了较大的油气勘探潜力。以演武地区为例，综合三维地震、钻井、岩心及开发动态资料，开展断裂研究，分析了断裂对侏罗系延安组油藏的控制作用。结果表明：演武地区中生界发育北西—南东向、北东东—南西西向及近东西向3组断裂，以近直立的走滑断裂为主，断裂具有横向分带、纵向分层的特点；三叠系延长组发育的少量北西—南东向断裂形成于印支运动期，侏罗系延安组发育的北东东—南西西向和近东西向断裂主要形成于燕山运动期，且在侏罗系中密度最大，不连续小断裂在燕山运动晚期—喜马拉雅运动期贯穿连接，形成主断裂带；北东东—南西西向走滑断裂垂向沟通烃源岩和储集层，有利于油气在侏罗系聚集成藏，断裂主位移带附近的控圈断裂断距大，多期活动致使油气逸散，不利于油气藏保存，断裂尾端或叠接区发育裂缝，断缝体易导致水线突进，对油藏注水开发影响较大。

关键词: 鄂尔多斯盆地, 演武地区, 侏罗系, 走滑断裂, 断缝体, 输导体系, 控藏作用

Abstract:

A number of Jurassic reservoir groups have been discovered in the southern part of the Tianhuan depression in the Ordos Basin, highlighting significant oil and gas exploration potential. Taking the Yanwu area as an example, by integrating the data of 3D seismic, drilling, core, and production performance, the fault characteristics were investigated, and the controls of these faults on the Jurassic Yan’an formation reservoir were analyzed. The results indicate that the Mesozoic in the Yanwu area develops three groups of major faults trending in NW-SE, NEE-SWW, and nearly E-W, which are primarily sub-vertical strike-slip faults featured with lateral zonation and vertical stratification. The NW-SE faults in the Triassic Yanchang formation were formed during the Indosinian Movement. The NEE-SWW and nearly E-W faults in the Jurassic Yan’an formation were mainly formed during the Yanshanian Movement, with the highest fault density in the Jurassic, and some discontinuous minor faults connected and extended through the Late Yanshanian to Himalayan to create the main fault belt. The NEE-SWW strike-slip faults vertically communicate source rocks and reservoir rocks, facilitating hydrocarbon migration and accumulation in the Jurassic. The trap-controlling faults near the main displacement zone, which exhibit large fault throws, resulted in hydrocarbon escape during multiple phases of activity, compromising reservoir preservation. Fractures are developed at fault ends or in overlapping zones. These fault-related fractured reservoir may suffer water front advancing, significantly impacting waterflooding effect in the reservoirs.

Key words: Ordos Basin, Yanwu area, Jurassic, strike-slip fault, fault-related fractured reservoir, pathway system, reservoir-controlling effect

中图分类号:

TE122

龙盛芳, 侯云超, 赵玉华, 张杰, 郝金鑫, 谷兆兴. 鄂尔多斯盆地演武地区断裂特征及其对侏罗系油藏的影响[J]. 新疆石油地质, 2025, 46(3): 329-337.

LONG Shengfang, HOU Yunchao, ZHAO Yuhua, ZHANG Jie, HAO Jinxin, GU Zhaoxing. Fault Characteristics and Influences on Jurassic Reservoirs in the Yanwu Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(3): 329-337.

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