川东南綦江地区断裂体系特征及其控藏作用  

Characteristics of fault systems and their reservoir control in the Qijiang area of southeastern Sichuan Basin

作　　者：李智 张仲培[1,2,3] 李双建 夏文谦[4] Zhi LI;Zhongpei ZHANG;Shuangjian LI;Wenqian XIA(State Energy Key Laboratory for Carbonate Oil and Gas,Beijing 102206,China;SINOPEC Petroleum Exploration and Production Research Institute,Beijing 102206,China;SINOPEC Key Laboratory of Geology and Resources in Deep Stratum,Beijing 102206,China;SINOPEC Exploration Company,Chengdu 610041,China)

机构地区：[1]国家能源碳酸盐岩油气重点实验室,北京102206 [2]中国石化石油勘探开发研究院,北京102206 [3]中国石化深部地质与资源重点实验室,北京102206 [4]中国石化勘探分公司,四川成都610041

出　　处：《天然气地球科学》2024年第11期1999-2011,共13页Natural Gas Geoscience

基　　金：国家自然科学基金企业重点联合基金“盆地深部地质作用过程与资源效应”(编号:U20B6001);国家自然科学基金企业创新发展联合基金“海相深层油气富集机理与关键工程技术基础研究”(编号:U19B6003)联合资助。

摘　　要：四川盆地东南缘綦江地区发育侏罗纪以来的逆冲褶皱带,但缺少深部自古生代以来多类型断裂体系及其控油气作用的系统研究。基于最新钻井和高精度三维地震资料,结合高精度相干等地球物理属性开展綦江及邻区断裂识别,刻画断裂剖面形态和平面展布,探讨不同断裂的形成演化过程及对油气成藏保存的控制作用。结果表明:綦江地区主要发育逆冲和走滑2类断裂,剖面以多套滑脱层为界具分层特征,平面主要发育NNW—SSE向、NE—SW向和近W—E向3组断裂。其中NNW—SSE向断裂为加里东期下古生界走滑断裂和燕山期上古生界—中生界逆冲断裂的纵向叠置;NE—SW向断裂为海西期环带状正断层在燕山期的反转逆冲;近W—E向断裂为喜马拉雅期受盆地南缘大娄山方向造山挤压形成的逆断层。海西期拉张背景下NNW—SSE向走滑断裂和NE—SW向正断层控制了茅口组岩溶储层发育;燕山期挤压背景下断裂活化形成构造缝洞并沟通源储,通源断裂和规模储集体的叠置是綦江地区二叠系油气勘探的重点领域;而NNW—SSE向断裂在喜马拉雅期以来的走滑作用强度,则控制了志留系龙马溪组页岩气的后期稳定保存条件。The Qijiang area on the southeastern edge of the Sichuan Basin has developed thrust fold belts since the Jurassic,but there is a lack of systematic research on multiple types of fault systems and their control over oil and gas since the deep Paleozoic.Based on the drilling and high-precision 3D seismic data,the identification of faults in Qijiang area and its adjacent areas is carried out according to the high-precision coherence and other geophysical properties.The profile shape and plane distribution are characterized,and the differences in the formation and evolution process of different faults and their control over the formation and preservation of oil and gas reservoirs are clarified.The research results indicate that the Qijiang area mainly develops two types of faults:thrust and strike slip.The profile is characterized by multiple sets of detachment layers with layered fracture characteristics.The plane mainly develops three sets of faults in the NNW-SSE,NE-SW,and near W-E directions.The NNW-SSE trending fault is a longitudinal overlap of the Lower Paleozoic strike slip fault during the Caledonian period and the Upper Paleozoic Mesozoic thrust fault during the Yanshan period;The NE-SW trending fault is a reverse thrust of the Hercynian ring-shaped normal fault during the Yanshanian period;The nearly W-E trending fault is a reverse fault formed during the Xishan period by the orogenic compression in the direction of Daluoshan on the southern edge of the basin.The development of karst reservoirs in the Maokou Formation was controlled by NNW-SSE trending strike slip faults and NE-SW trending normal faults under the tension background of the Haixi period;Under the compression background of the Yanshan period,the activation of faults formed structural fractures and connected the source and reservoir,and the overlapping of source faults and large-scale reservoirs is a key area for the exploration of Permian oil and gas in the Qijiang area;The strength of the strike slip effect of the NNW-SSE trending fault sinc

关 键 词：逆冲断裂 走滑断裂 沟通源储 加里东期 綦江地区 

分 类 号：TE121.3[石油与天然气工程—油气勘探]