摘要
鄂尔多斯盆地西缘沙井子段为了优选天然气勘探目标,进行了构造特征研究.针对沙井子段,应用断层相关褶皱理论进行构造分析,划分了西部隆起带、中部双层构造带和东部基底卷入逆冲带,其中:西部隆起带地层向西逐渐抬升,地层分布稳定;中部崾崄壕双层构造带,以石炭系煤层滑脱层为界,上部发育构造楔,下部为原地构造;东部四合掌地区即西缘冲断带与天环凹陷接触带发育高角度的大型基底卷入型构造,多个构造楔处在逆冲断裂的下盘,故此中部与东部的构造楔形成"双楔构造".中部构造楔定型期是晚侏罗纪,这也是主要的生排烃阶段.因此,构造楔的形成期与主生排烃期具有一定的匹配性,而且构造楔处在二叠系地层中,埋藏较深,受后期改造较弱,天然气保存条件好,勘探潜力大.
The structural styles are characterized by the thrust belts in the western margin of the Ordos Basin,so the gas exploration in this region is very difficult. Based on the structural analysis of faultrelated folds and their relationship,this structural region can be divided into the uplift zone in the west,the central double-layer structural zone and the east basement-involved thrust zone. The central double-layer structural zone in the Yaoxianhao is subdivided by a detachment layer of Carboniferous coal seam into the upper tectonic wedge, the lower in-situ rock, and the eastern part.However,between the western margin thrust belt and the Tianhuan Depression transition zone developed high-angle large basementinvolved structures, multiple tectonic wedges developed in the footwall of the reverse fault. Therefore,the formation of double wedge structure and the central tectonic wedge are consistent with the main hydrocarbon generation and expulsion in time. The tectonic wedge in the Permian strata is characterized by the deeply buried depth, weak re-deformation, good preservation conditions and exploration potential.
作者
高建荣
刘凯霞
徐旺林
赵振宇
张延玲
刘俊榜
张月巧
GAO Jian-rong;LIU Kai-xia;XU Wang-lin;ZHAO Zhen-yu;ZHANG Yan-ling;LIU Jun-bang;ZHANG Yue-qiao(PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;China Petroleum Huabei Oilfield First Oil Production Plant Education and Training Center,Hebei Renqiu 062550,China)
出处
《地球物理学进展》
CSCD
北大核心
2018年第4期1491-1494,共4页
Progress in Geophysics
基金
国家科技重大专项课题(2016ZX05004)
中国石油天然气股份有限公司科技项目(2016B-0401)联合资助
关键词
鄂尔多斯盆地
西缘冲断带
沙井子
双楔构造
Ordos Basin
western margin thrust belt
Shajingzi
double wedge structure
