元坝地区长兴组生物孔隙特征及控制因素  

The Controlling Factors and Characteristics for Biological Pores of Changxing Formation in Yuanba Area,Sichuan Basin

作　　者：黄勇[1] 张汉荣[1] 范小军[1] 

机构地区：[1]中国石化勘探南方分公司研究院,四川成都610041

出　　处：《西南石油大学学报（自然科学版）》2013年第1期79-85,共7页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：川东北元坝地区二叠系长兴组台地边缘暴露礁滩、礁后暴露浅滩白云岩优质储层发育。通过对元坝20多口钻井数百米岩芯的观察和描述及1 000多块铸体薄片的鉴定分析发现,储层储集空间类型众多,主要有白云石晶间孔、生物体腔孔、生物格架孔、生物粒间孔及其相应溶孔和裂缝等,其中生物溶孔及具生物成因的次生孔、洞是元坝长兴组礁滩及礁后浅滩储层的优势储集空间;少部分次生孔隙由白云石化、溶蚀作用和重结晶作用等直接形成,多数次生孔隙由生物孔隙经白云石化、溶蚀作用和重结晶作用改造后形成;生物成因孔隙的发育除受生物自身矿物组分、结构、形态等内因的控制外,归根结底受沉积相及建设性成岩作用的控制;生物及其溶孔发育是川东北元坝地区长兴组台缘礁滩及礁后暴露浅滩优质储层发育的主控因素之一。Quality Dolomite Reservoir of exposure shallow shoal in back reef and the exposure reef flat has developed on the platform edge of Changxing Formation in Yuanba Area in Sichuan Basin. By observation and description to hundreds of meters drilling core and more than one thousand cast pieces sections of more than 20 wells drilling, we discover many reservoir space type. The major reservoir space types are the dolomite intercrystalline pore, organism coelom pore, framework pore, the biological intergranular porosity and dissolved pore or break, etc. The advantage reservoir spaces of the quality dolomite reservoir Changxing Formation in Yuanba Area in Sichuan Basin, are the biological dissolved pores, and the secondary origin porosities and cavities related to biology. The minority of secondary pores are formed directly by dolomitization, dissolution and recrystallization etc, while the majority from biological pore. The biological pore are controlled by sedimentary context and constructional diagenesis besides internal cause, such as mineral composition, architecture, conformation, ect. The devel- opment of biology and dissolved pore are one of the main control factors for the quality Dolomite Reservoir in the exposure shallow shoal in back reef and the exposure reef flat on the platform edge of Changxing Formation in Yuanba Area.

关 键 词：生物孔隙 特征 控制因素 长兴组 元坝地区 

分 类 号：TE122[石油与天然气工程—油气勘探]