四川盆地中部资阳地区张扭断裂三维构造模型、构造演化与油气地质意义  

Three-dimensional structural models,evolutions and petroleum geological significances of transtensional faults in the Ziyang area,central Sichuan Basin,SW China

作　　者：田方磊 郭彤楼[3] 何登发[1,2] 顾战宇[3] 孟宪武[3] 汪仁富 王莹[3] 张伟康 鲁国 TIAN Fanglei;GUO Tonglou;HE Dengfa;GU Zhanyu;MENG Xianwu;WANG Renfu;WANG Ying;ZHANG Weikang;LU Guo(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083,China;Sinopec Southwest Oil and Gas Company,Chengdu 610031,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]中国石化西南油气田公司,成都610031

出　　处：《石油勘探与开发》2024年第3期526-540,共15页Petroleum Exploration and Development

基　　金：国家自然科学基金重点项目“上扬子克拉通盆地深层新元古代裂谷体系的结构、成因及其控油气作用”(42330810)。

摘　　要：基于钻井和地震数据,通过平面-剖面构造解析、三维断层构造建模、垂向断距分析及平衡剖面恢复,对四川盆地资阳地区张扭(走滑)断裂系统进行研究。结果表明,资阳三维地震工区张扭断裂系统由北东走向、伸展变形主导的F_(Ⅰ)19和F_(Ⅰ)20断裂带以及北西走向、右旋剪切变形的3组雁列正断层构成。其中,F_(Ⅰ)19、F_(Ⅰ)20断裂带贯穿新元古界—中下三叠统嘉陵江组,表现出“S”形丝带状的三维结构,在二叠系沉积前及早三叠世至少经历两期构造叠加改造;北西向的3组雁列正断层由两两成对、倾向相反、部分左阶排列的小型正断层构成,在二叠系沉积前基本定型,对F_(Ⅰ)19断裂带向东的生长和扩展造成限制。F_(Ⅰ)19、F_(Ⅰ)20断裂带自深往浅沟通多套烃源岩和储层,断层活动时间与生烃高峰期匹配良好;在F_(Ⅰ)19、F_(Ⅰ)20断裂带两侧的局部低幅背斜带上,若叠加发育寒武系—三叠系有利沉积相带和储层,则该区有望成为天然气聚集有利区。With drilling and seismic data of Transtensional(strike-slip)Fault System in the Ziyang area of the central Sichuan Basin,through plane-section integrated structural interpretation,3-D fault framework model building,fault throw analyzing,and balanced profile restoration,it is pointed out that the transtensional fault system in the Ziyang 3-D seismic survey consists of the northeast-trending F_(Ⅰ)19 and F_(Ⅰ)20 fault zones dominated by extensional deformation,as well as 3 sets of northwest-trending en echelon normal faults experienced dextral shear deformation.Among them,the F_(Ⅰ)19 and F_(Ⅰ)20 fault zones cut through the Neoproterozoic to Middle-Lower Triassic Jialingjiang Formation,presenting a 3-D structure of an“S”-shaped ribbon.And before Permian and during the Early Triassic,the F_(Ⅰ)19 and F_(Ⅰ)20 fault zones underwent at least two periods of structural superimposition.Besides,the 3 sets of northwest-trending en echelon normal faults are composed of small normal faults arranged in pairs,with opposite directions and partially left-stepped arrangement.And before Permian,they had formed almost,restricting the eastward growth and propagation of the F_(Ⅰ)19 fault zone.The F_(Ⅰ)19 and F_(Ⅰ)20 fault zones communicate multiple sets of source rocks and reservoirs from deep to shallow,and the timing of fault activity matches well with oil and gas generation peaks.If there were favorable Cambrian-Triassic sedimentary facies and reservoirs developing on the local anticlinal belts of both sides of the F_(Ⅰ)19 and F_(Ⅰ)20 fault zones,the major reservoirs in this area are expected to achieve breakthroughs in oil and gas exploration.

关 键 词：张扭(走滑)断裂 三维构造模型 构造演化 油气地质意义 资阳地区 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]