四川盆地震旦系灯影组储层特征及成因  

Reservoir characteristics and genesis of the Sinian Dengying formation in Sichuan basin

作　　者：王文之[1] 杨跃明[1] 张玺华[1] 邹定永[1] 马松华 孙奕婷 彭瀚霖[1] 

机构地区：[1]中国石油西南油气田分公司勘探开发研究院,四川成都610051 [2]四川路桥矿业投资开发有限公司,四川成都610093

出　　处：《东北石油大学学报》2016年第2期1-10,121,共10页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05004-005);中国石油天然气股份有限公司重大科技专项(2013E-050208)

摘　　要：为明确四川盆地震旦系灯影组的储层特征及成因,以钻井岩心、薄片观察、扫描电镜和碳氧稳定同位素分析等资料为基础,分析研究区储层的储集空间类型及储层特征、成因。结果表明：灯影组储集岩类以凝块状云岩、砂屑云岩为主,储集空间以次生孔隙、溶蚀孔洞为特征;沉积相是储层的物质基础,藻丘和颗粒滩亚相控制储层在平面上的分布范围和规模;溶蚀是储层形成的关键,同生期溶蚀增加储层的比表面积,为后期岩溶提供有利的物性条件;表生期溶蚀控制优质储层在纵向上的分布,主要分布在距离不整合面100m以内;埋藏期溶蚀对储层总孔隙度改变不大,但使前期较分散的储层趋于富集。早期裂缝（第一~三期）为各期流体及烃类充注提供导引作用,晚期裂缝（第四~五期）改善灯影组储层的渗透能力。该结果对研究区气田的勘探和开发具有参考意义。In order to clarify reservoir characteristics and genesis of Dengying formation in Sichuan basin,based on drilling core,thin section,scanning electron microscopy(SEM)and the carbon and oxygen stable isotopic analysis for the foundation,reservoir space types,characteristics and genesis are analyzed in study area.Studies have shown that thrombolite and psammitic dolomite are the main reservoir rocks of Dengying formation,and secondary porosity and dissolution cavities are the main reservoir space.Sedimentary facies is the material basis of reservoir,algal and grain bank subfacies control the scope and scale of reservoir distribution in the plane;dissolution is the key role for reservoir formation.Surface area of reservoir is increased by syn-sedimentary karstification,for the latter karstification provides a better physical condition;supergene karst control distribution of the quality reservoir in the longitudinal direction mainly distributed in the less than 100 maway from unconformity surface.Total porosity of the reservoir changed little inburied karstification,but it makes pre-decentralized reservoir tend to concentrate.Early crack(first to third)has a positive role in guiding the each stage fluid and hydrocarbon filling.Land the late cracks(fourth to fifth)greatly improved the penetration of reservoir of Dengying formation.The results may serve as reference for the next step in gas field exploration and development in the study area.

关 键 词：震旦系 微生物 碳酸盐岩 灯影组 储层特征 储层成因 

分 类 号：TE122.2[石油与天然气工程—油气勘探]