开江-梁平海槽周缘二叠系-三叠系礁滩组合分布与成因  

Distribution and genesis of Permian-Triassic reef-shoal combination around Kaijiang-Liangping trough in Sichuan Basin,China

作　　者：杨雨[1] 钟原 李林娟[1] YANG Yu;ZHONG Yuan;LI Linjuan(PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China)

机构地区：[1]中国石油西南油气田分公司,成都610051 [2]西南油气田勘探开发研究院,成都610041

出　　处：《成都理工大学学报（自然科学版）》2021年第6期683-690,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05004-005);中国石油天然气股份有限公司重大科技专项(2016E-0602)。

摘　　要：研究四川盆地开江-梁平海槽边缘二叠系-三叠系礁滩组合的分布规律及成因。综合利用开江-梁平海槽周缘钻井、测井、基底断裂特征、台缘坡度等资料,在前期沉积相研究及连井对比的基础上,系统总结海槽两侧典型的礁滩组合类型,分析其主控因素并建立相关的成因模式。研究表明:①根据礁滩纵向叠置关系可分为陡缘礁滩加积叠置型、次陡缘礁后滩叠置型、缓缘单礁型等组合类型;②构造活动导致的基底断裂控制了台缘地貌变化,生物礁的生长进一步加剧台缘地貌分异,奠定了后期鲕滩沉积的地貌基础;③海平面上升速率与生物礁生长速率匹配良好时,有利于生物礁发育,并且海平面升降将对平面上礁滩及相带组合分布产生影响。礁滩的纵向组合及平面分布特征是构造活动与海平面变化共同作用下的结果,运用礁滩之间的组合规律可为气藏的有效勘探提供借鉴。Based on the data of drilling,logging,basement fault characteristics and platform edge slope,the typical reef-bank assemblages around Kaijiang-Liangping trough in Sichuan Basin are systematically summarized.Its main controlling factors and related genetic models are analyzed and established so as to study the distribution and genesis of Permian-Triassic reef-shoal assemblages on the edge of Kaijiang-Liangping trough.The results show that:(1)According to the longitudinal overlapping relationship of reef shoal,it can be divided into steep margin reef shoal overlapping type,sub steep margin reef shoal overlapping type,and gentle margin single reef type.(2)The basement faults caused by tectonic activities controlled the changes of platform edge geomorphology,and the growth of organic reefs further intensified the differentiation of platform edge geomorphology,which laid the geomorphological foundation of oolitic shoal deposition in the later period.(3)When the rate of sea level rise is well matched with the rate of reef growth,it is conducive to the development of reef,and the rise and fall of sea level affect the distribution of reef beach and facies zone combination on the plane.Therefore,the longitudinal combination and plane distribution characteristics of reef-shoal are the result of tectonic activity and sea level change.The combination law between reef and shoal provides reference for effective gas reservoir exploration.

关 键 词：开江-梁平海槽 台地边缘 礁滩气藏 二叠系 三叠系 四川盆地 

分 类 号：P588.248[天文地球—岩石学] P534.46[天文地球—地质学]