南堡凹陷东营组储层特征及影响因素分析

Reservoir characteristics and influential factors analysis of Dongying formation in Nanpu depression

以分析化验、岩心描述资料为基础,应用偏光显微镜、扫描电镜等技术手段,研究南堡凹陷古近系东营组储层岩石学基本特征、成岩作用及成岩演化、孔隙类型和物性特征,探讨研究区储层发育主控因素,结果表明:东营组主要储集空间类型有原生孔和溶蚀孔两大类,其中溶蚀孔隙是重要的储集空间类型;碎屑岩的碎屑和填隙物成分是孔隙变化的内在因素,而成岩作用的改造是孔隙演变最主要的外在因素,其中压实作用使储层物性变差,而溶蚀作用则有利于改善中深层储层物性;东营组最有利储层类型为中孔中渗储层,主要分布在东一段,东二、三段储层类型为中-低孔、中-低渗储层。

On the basis of the analysis test , core description data , by applying technical means such as polarizing microscope , scanning electron microscopy ( sem ), the research of petrology characteristics , diagenesis and diagenetic evolution , pore type and physical characteristics of Dongying formation in Nanpu depression has been carried out to explore the main controlling factors of reservoir development in the study area.The results show there are two major categories of main reservoir space types in Dongying formation , primary pore and dissolution pore.The dissolution pores are the important reservoir space types.Clastic rock debris and filler content composition are the intrinsic factors on the changes of pore , while pore evolution and diagenesis modification are the main external factors , among which compaction makes a poor reservoir property , while dissolution is advantageous to the improvement of deep reservoir physical properties.The most favorable reservoir type in Dongying formation is of medium porosity and permeability mainly distributed in E1 , while those in E2 and E3 belong to medium-low porosity and permeability reservoir.