四川盆地金秋区块三叠系须二段储层非均质性及成因  

Reservoir heterogeneity and genesis of the second member of Xujiahe Formation of Triassic in Jinqiu block,Sichuan Basin

作　　者：柴毓[1] 王贵文[2] 柴新 CHAI Yu;WANG Guiwen;CHAI Xin(Petroleum Industry Press,Beijing 100011,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Tianjin Company,CNPC logging Co.,Ltd.,Tianjin 300280,China)

机构地区：[1]石油工业出版社有限公司,北京100011 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油集团测井有限公司天津分公司,天津300280

出　　处：《岩性油气藏》2021年第4期29-40,共12页Lithologic Reservoirs

基　　金：国家科技重大专项“低渗透碎屑岩储层品质与岩石物理相测井评价方法”(编号:2011ZX05020-008);中石油创新基金“致密砂砾岩岩性岩相测井识别方法研究”(编号:2013D-5006-030)联合资助。

摘　　要：为了研究四川盆地金秋区块三叠系须二段储层非均质性及成因,以分析其微观驱替效率和剩余油分布、制定合理的开发方案、提高开发效率,开展了岩心观察、薄片鉴定、扫描电镜分析、压汞测试、核磁共振和常规测井分析等。结果表明:①四川盆地金秋区块三叠系须二段在多期构造运动和后期成岩改造作用下,孔隙类型多样、喉道普遍较细,孔喉结构和物性在各地区表现出较大的差异性,非均质性强。②须二段储层储集空间以次生孔隙为主,原生孔隙较少,表明沉积物进入埋藏成岩环境后,主要受后期成岩作用、成岩环境和成岩演化阶段的影响,形成了现今储层非均质性强的特点,并根据成岩作用类型、强度和对储层物性的建设或破坏作用将须二段储层划分为4种成岩相类型。③须二段储层物性和非均质性受构造、沉积、成岩作用共同影响,特定构造和沉积背景为储层非均质性的形成奠定了基础,溶蚀、破裂作用等建设性成岩作用及其强度是决定储层非均质性的关键因素。该研究成果可为四川盆地金秋区块三叠系须二段油气勘探提供借鉴。In order to study the heterogeneity and genesis of the second member of Xujiahe Formation of Triassic in Jinqiu blockn,Sichuan Basin,to analyze its micro displacement efficiency and remaining oil distribution,and to formulate reasonable development plan and improve development efficiency,core observation,thin section identification,scanning electron microscope analysis,mercury injection test,nuclear magnetic resonance and conventional logging analysis were carried out. The result shows that:(1)Under the effect of multi-stage tectonic movement and late diagenetic transformation,the pore types of the second member of Xujiahe Formation are diverse,the throat is generally fine,the pore throat structure and physical properties show great differences in different regions,and the heterogeneity is strong.(2)The reservoir space of the second member of Xujiahe Formation is mainly composed of secondary pores and less primary pores,which indicates that after entered the burial diagenetic environment,the sediments were mainly affected by later diagenesis,diagenetic environment and diagenetic evolution stage,forming strong heterogeneity of the present reservoir. According to the type and intensity of diagenesis and the construction or destruction of reservoir physical properties,the second member of Xujiahe Formation was divided into four types of diagenetic facies.(3)The physical properties and heterogeneity of the second member of Xujiahe Formation are affected by structure,sedimentation and diagenesis. The specific structure and sedimentary background provide prerequisite for the formation of reservoir heterogeneity. Constructive diagenesis(dissolution and fracturing)and diagenetic strength are crucial for reservoir heterogeneity. The research results can provide a reference for oil and gas exploration of the second member of Xujiahe Formation in Jinqiu block,Sichuan Basin.

关 键 词：储层非均质性 成岩作用 成岩相 须二段 三叠系 金秋区块 四川盆地 

分 类 号：TE122.21[石油与天然气工程—油气勘探]