鄂尔多斯盆地东部高家堡地区下古生界断裂分层变形特征及形成机制  

Characteristics and formation mechanism of stratified deformation of Lower Paleozoic faults in Gaojiapu area,eastern Ordos Basin

作　　者：陈平 李明瑞 李维 强敏 路鹏程 于小伟 韩伟 CHEN Ping;LI Mingrui;LI Wei;QIANG Min;LU Pengcheng;YU Xiaowei;HAN Wei(Changqing Branch,Geophysical Research Institute,BGP,PetroChina,Xi’an,Shaanxi 710021,China;Exploration Department,Changqing Oilfield Company,PetroChina,Xi’an,Shaanxi 710018,China)

机构地区：[1]中国石油东方地球物理勘探有限责任公司研究院长庆分院,西安710021 [2]中国石油长庆油田分公司勘探事业部,西安710018

出　　处：《石油实验地质》2024年第3期542-552,共11页Petroleum Geology & Experiment

基　　金：中国石油科学研究与技术开发项目“海相碳酸盐岩重点领域综合地质研究与高效勘探关键技术攻关”(2022KT0103)资助。

摘　　要：近年来,鄂尔多斯盆地奥陶系马家沟组五段以深地层相继取得勘探突破,揭示了其巨大的勘探潜力。随着高精度三维地震资料的部署以及油气勘探的深入,断裂对马五段以深气藏的控制作用越发凸显。基于高精度三维地震资料,在系统刻画高家堡地区断裂几何学特征的基础上,解剖断裂典型构造样式,建立断裂形成演化模式,并结合钻井试气资料探讨断裂对马五段以深气藏差异富集的控制作用。研究取得了以下认识:鄂尔多斯盆地高家堡地区下古生界断裂具有明显的分层变形特征,盆地内马三段、马五段两套膏盐岩是造成断裂分层的主要原因之一;高家堡地区下古生界主要发育具有压扭性质的走滑断裂和逆冲断裂;通过对高家堡地区地层构造形态及断裂样式的研究,推测燕山构造运动是对加里东构造运动形成的断裂影响最大的一期后期改造运动;高家堡地区地层构造隆升期与油气充注期耦合,断裂具有改善储层、沟通源岩、控制圈闭等多重作用。In recent years,exploration breakthroughs have been successively achieved in the strata deeper than the fifth member of the Lower Ordovician Majiagou Formation in the Ordos Basin,revealing its tremendous exploration potential.With the deployment of high-precision 3D seismic data and the deepening of oil and gas exploration,the control exerted by faults on the gas reservoirs in the deeper layers of the fifth member has become increasingly prominent.Based on high-precision 3D seismic data,this study systematically characterized the geometric features of faults in the Gaojiabao area,dissected typical fault structural patterns,established fault formation and evolution models,and,in conjunction with drilling and testing data,discussed the control of faults on the differential enrichment of gas reservoirs in the deeper layers of the Majiagou Formation.The study yielded the following insights:Faults in the Lower Paleozoic of the Gaojiabao area in the Ordos Basin exhibit distinct stratified deformation characteristics,with the two sets of gypsum-salt rocks in the third and fifth members being major contributors to fault stratification.The Lower Paleozoic in the Gaojiabao area mainly develops strike-slip faults with compressional and torsional properties and thrust faults.Through studying the structural morphology and fault patterns of the Gaojiabao area,it is inferred that the Yanshan tectonic movement was the most signifi-cant phase of reformation affecting the faults formed during the Caledonian tectonic movement.The coupling of the structural uplift period with the oil-gas charging period in the Gaojiabao area means that faults play multiple roles,including improving reservoirs,connecting source rocks,and controlling traps.

关 键 词：燕山期 加里东期 断裂分层 奥陶系 高家堡地区 鄂尔多斯盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]