基于扫描电镜的砂岩储层分析：以白云凹陷珠江组三角洲前缘砂体为例
刘惟庆，吴 伟，秦成岗，舒良锋基于扫描电镜的砂岩储层分析：以白云凹陷珠江组三角洲前缘砂体为例
刘惟庆1，吴 伟1*，秦成岗2，舒良锋2
（1. 河南理工大学资源环境学院，河南焦作454003；2. 中国海洋石油深圳分公司研究院，广东广州510240）
摘 要：本文通过扫描电镜和铸体薄片观察并结合X射线衍射和压汞分析对珠江口盆地白云凹陷珠江组岩屑砂岩储层的孔隙结构、矿物组成进行了分析，结果表明：珠江组岩屑砂岩储层发育有原生孔隙和次生孔隙，储层平均孔隙度12.3%，属于物性良好的油气储层。储层中原生孔隙发育较差，孔隙组成以次生孔隙为主，次生空隙中溶孔和铸模孔构成了储层主要孔容，为油气主要富集渗流场所。储层自生矿物包括粘土矿物、次生石英加大、黄铁矿和片沸石等，粘土矿物为主要自生矿物，其发育程度与储层孔隙度呈负相关性。
关键词：扫描电镜；岩屑砂岩；储层；珠江组；白云凹陷
中图分类号：TE122.2；TG115.21+5.3 文献标识码：A
doi:10.3969/j.1000-6281.2014.02-004
Analysis on the sandstone reservoir by SEM：A case study of the delta front sand body of Zhujiang Formation，Baiyun Sag
LIU Wei-qing1，WU Wei1*，QIN Cheng-gang2，SHU Liang-feng2
（1.Institute of Resources & Environment, Hennan Polytechnic University, Jiaozuo Henan 454003; 2.Institute of Shenzhen Branch Company of China National Offshore Petroleum Corporation, Guangzhou Guangdong 510240,China）
Abstract：This paper analyses the pore structure of lithic sandstone reservoir and mineral composition ofZhujiang Formation of Pearl River mouth basin by means of observing the scanning electron microscope and the casting thin sections, XRD and the analysis of mercury intrusion. The result show that the reservoir development of Zhujiang Formation of Pearl River mouth basin has two kinds of pore: primary pore and secondary pore. The average porosity of reservoir is 12.3%, which belongs to the oil and gas reservoir of high quality. The development of primary pore in reservoir is poor. The pore composition is given priority to secondary pore, in which the dissolution pore and mold pore constitute the main entrance which provides the main seepage places of oil gas. Reservoir’s authentic mineral includes clay minerals, secondary reservoir and heulandites quartz and pyrite, etc. Clay mineral is the main authigenic mineral, and its development degree has a negative correlation with the reservoir porosity.
Keywords：SEM；lithic sandstone；reservoir；Zhujiang Formation；Baiyun Sag
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