川西北部地区飞仙关组层序地层格架及镶边台地沉积演化  

Sequence stratigraphic framework and rimmed platform sedimentary evolution of Feixianguan Formation in Northwestern Sichuan Basin

作　　者：完颜泽 王明磊[1] 郑超 王旭丽 尹宏[3] 罗洋 王宇峰[3] 胡欣[3] 李润彤 汤潇 WANYAN Ze;WANG Minglei;ZHENG Chao;WANG Xuli;YIN Hong;LUO Yang;WANG Yufeng;HU Xin;LI Runtong;TANG Xiao(Exploration and Development Research Institute,PetroChina,Beijing 100083,China;Exploration and Development Research Institute,Southwest Oil and Gas Field Company,PetroChina,Chengdu 610500,China;Northwest Sichuan Gas District,Southwest Oil and Gas Field Company,PetroChina,Jiangyou 621709,China;Technical Consulting Center,Southwest Oil and Gas Field Company,PetroChina,Chengdu 610500,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田公司勘探开发研究院,四川成都610500 [3]中国石油西南油气田公司川西北气矿,四川江油621709 [4]中国石油西南油气田公司技术咨询中心,四川成都610500

出　　处：《断块油气田》2022年第5期633-640,共8页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“川东北早三叠世飞仙关期同期多排碳酸盐岩台缘带不对称沉积结构及成因”(41302089)。

摘　　要：川西北部地区飞仙关组多口井测试获气流,由于储层物性差异,使得测试产量差别较大。为进一步明确飞仙关组滩相储层发育及演化规律,文中利用层序地层学理论及岩心、测录井、地震资料,对飞仙关组地层层序进行逐级划分,并在层序地层格架的基础上,开展沉积模式与优质储层发育规律分析。研究表明:飞仙关组划分为3个三级层序、6个体系域,发育开阔台地—台地边缘—台前斜坡—海槽(盆)沉积体系,台地向北东方向逐渐迁移,并在SQ1沉积期晚期将开江—梁平海槽填平补齐;SQ2沉积期台地边缘迁移至九龙山地区,广泛发育台内鲕粒滩与台缘鲕粒滩微相;SQ3沉积期整体为浅水、平缓的局限-蒸发沉积;具有白云岩化、强溶蚀作用的滩体发育区是飞仙关组优质储层发育区,即SQ2台缘滩发育区。Many wells of Feixianguan Formation in Northwestern Sichuan Basin have been tested and obtained gases,but the test production varies greatly due to the difference of reservoir physical properties.In order to further clarify the development and evolution law of beach facies reservoir in Feixianguan Formation,the stratigraphic sequence of Feixianguan Formation is divided step by step by using the theory of sequence stratigraphy,core,logging and seismic data,and the sedimentary model and development law of high-quality reservoir are analyzed on the basis of sequence stratigraphic framework.The results show that Feixianguan Formation can be divided into three third-order sequences and six system tracts,which developed open platform,platform margin,platform foreslope and trough(marine basin)sedimentary system.The platform gradually migrated northeastward,and the Kaijiang-Liangping trough was filled up in the late SQ1 sedimentary period.The platform margin migrated to Jiulongshan area in the SQ2 sedimentary period,and the oolitic shoal microfacies in the platform and platform margin were widely developed.The shallow water and gentle restricted-evaporite deposition were developed in SQ3 period.The beach development area with dolomitization and strong dissolution is the high-quality reservoir development area of Feixianguan Formation,namely SQ2 platform margin beach development area.

关 键 词：储层发育区 沉积模式 层序地层 飞仙关组 川西北部地区 

分 类 号：TE121.3[石油与天然气工程—油气勘探]