地质学报2025，Vol.99Issue(12)：4105-4119,15.DOI:10.19762/j.cnki.dizhixuebao.2024441
四川盆地二叠纪两类典型碳酸盐台地边缘及古地理分异格局
Permian paleogeographic differentiation evolution and platform margin model comparison in Sichuan basin
摘要
Abstract
The carbonate platform margin is an important gathering place of large-scale oil and gas resources,and the study of paleogeographic differentiation is the basis to reveal the characteristics and development laws of the carbonate platform margin.Following the discovery of a trillion square meter natural gas gold accumulation zone in the platform margin reef-beach facies of the Upper Permian Changxing Formation in Sichuan basin,the platform margin beach reservoir of the Middle Permian Maokou Formation has recently been discovered,and several open flow wells of more than one million square meters have shown great exploration potential.However,there are significant differences in sedimentary filling and reservoir characteristics between these two periods,and detailed comparative analysis will help deepen the understanding of carbonate platform model and its reservoir control effect.Based on a large number of drilling,fieldoutcrop and seismic data from the Sichuan basin and its surrounding Permian system,the typical sedimentary facies and lithofacies paleogeographic pattern are analyzed,and the differences between the two types of platform margins are compared.The results show the differentiation from shallow-water platform to deep water shelf by multiple synsedimentary faults occurred in Permian paleogeography of Sichuan basin from Maokou period,with Kaijiang-Liangping trough being the most typical.The shallow-water carbonate platform of Changxing Formation is characterized by the development of thick platform margin reef-beach facies,and the shallow-water carbonate platform of Maokou Formation is characterized by the development of thin platform margin beach facies,both of which rapidly change into siliceous rock and carbonaceous shale.The Maokou period belongs to the initial geomorphic inherited platform margin,which is represented by several thin beach bodies with intermittent accretion under the background of wide margin.In the Changxing period,the platform margin was shaped by sedimentary border,showing a thick reef flat body with continuous accretion or prograding under the background of narrow margin.In general,both platform margins have the potential to develop large-scale reservoirs and are important targets for exploration of large oil and gas accumulation zones.关键词
四川盆地/二叠系/古地理重建/台地边缘/礁滩体Key words
Sichuan basin/Permian/paleogeography reconstruction/carbonate platform margin/beach and reef引用本文复制引用
LI Wen,YANG Shuai,QI Renli,DENG Mo,CHEN Hongde,CHEN Anqing,ZHANG Xihua,SUN Shi,HUANG Huiwen,GAO Zhaolong,XU Shenglin,HUANG Guanghui,XIE Hao..四川盆地二叠纪两类典型碳酸盐台地边缘及古地理分异格局[J].地质学报,2025,99(12):4105-4119,15.基金项目
本文为国家自然科学基金区域创新发展联合基金(编号U24A20591)、国家自然科学基金项目(编号42402120,42272132)、四川省科技计划项目(编号2023NSFSC1986)、成都理工大学优质青年人才培育特支计划(编号20200-000526-04)、成都理工大学珠峰科学研究计划项目(编号80000-2025ZF11402)、中国石油天然气股份有限公司西南油气田公司勘探开发研究院项目(编号XNS勘研院JS2022-2599)、中国石油化工股份有限公司中原油田普光分公司项目(编号2404100083)和中国石油化工股份有限公司项目(编号P24146)联合资助的成果. （编号U24A20591）
