川东南地区典型走滑断裂带特征及断控缝洞型储层发育潜力  

Typical strike-slip fault zones in southeastern Sichuan:Fault characteristics and potential for fault-controlled fractured vuggy reservoirs

作　　者：石司宇 李毕松 李让彬[1,2] 邹玉涛 SHI Siyu;LI Bisong;LI Rangbin;ZOU Yutao(State Energy Key Laboratory for Carbonate Oil and Gas,Chengdu 610041,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,四川成都610041 [2]中国石化勘探分公司勘探研究院,四川成都610041

出　　处：《地学前缘》2024年第5期288-300,共13页Earth Science Frontiers

基　　金：中国石化股份有限公司项目“四川盆地及周缘资源评价(P23221)”。

摘　　要：受中小尺度基底走滑断裂带内部构造破裂作用控制,塔里木盆地顺北地区发育典型的断控缝洞型储层,近年来已于多条断裂带实现勘探突破。近期研究发现,四川盆地川东南地区NW向基底断裂也具有典型的走滑作用特征,需进一步针对是否发育断控缝洞型储层进行分析。本文基于连片三维地震资料,从基底走滑断裂几何学和运动学特征入手,对比分析塔里木顺北地区与川东南地区典型走滑断裂带附近不同时期地层变形特征。同时根据走滑断裂运动方向、不同构造层断裂活动的同步性分析,结合构造背景还原川东南地区基底断裂形成演化过程,并与顺北地区进行对比。最终参考顺北地区已证实的储层地震反射特征,对川东南地区典型走滑断裂带附近地震异常进行梳理,综合分析储层发育潜力。分析认为,川东南地区NW向基底走滑断裂带相关几何学、运动学特征参数与顺北地区类似;顺北地区经历多期同向叠加走滑作用,涪陵地区走滑断裂经历3期不同性质的活动。此外川东南地区也可识别出与顺北地区典型储层对应的地震反射特征,综合认为涪陵地区典型走滑断裂带断控缝洞型储层发育潜力较大,綦江地区也具有一定发育潜力。Controlled by the physical fracturing of medium and small-scale basement strike-slip fault zones fault-controlled fractured vuggy reservoirs are developed in Shunbei,Tarim Basin,where exploration breakthroughs have been made in recent years.Recent research has found that the NW-trending basement fractures in the southeastern Sichuan Basin also have typical strike-slip characteristics,while further analysis is needed to determine whether the area has undergone similar reservior development.Based on 3D seismic data,we start with the geometric and kinematic characteristics of strike-slip faults,and analyze and compare the deformation characteristics of typical strike-slip fault zones between Shunbei and the Fuling/Qijiang areas,southeastern Sichuan.Meanwhile,based on the analyses of fault movement direction,fault activity,and structural background,the formation and evolutionary history of basement faults in the study area is restored and compared with that of Shunbei.Finally,based on the proven seismic reflection characteristics of Shubei reservoirs,we sort out the seismic anomalies near typical strike-slip fault zones in the study area,and comprehensively analyze the area’s potential for reservoir development.The analyses suggest that the geometric and kinematic characteristics of the NW-trending basement strike-slip fault zone in the study area are similar to those in Shunbei that has undergone multi-periods of parallel strike-slip activities,while Fuling has experienced three periods of fault activities of different types.In addition,the seismic reflection characteristics corresponding to typical reservoirs in northern Shunbei can also be identified in the study area.It is generally believed that typical strike-slip fault zones in Fuling have great potential for the development of fracture-controlled fracture-cave reservoirs,and Qijiang also has certain development potentials.

关 键 词：川东南地区 走滑断裂带 几何学特征 运动学特征 断控缝洞型储层 

分 类 号：P618.13[天文地球—矿床学] TE121.2[天文地球—地质学]