东风港油田沙四上成岩作用分析

Analysis of Diagenesis in Shasishang Region of Dongfenggang Oilfield

通过钻井取心分析测试、薄片镜下观察、包裹体均一温度测定和扫描电镜等技术手段．对东风港油田沙四上成岩作用和次生孔隙发育特征进行了分析。本区段地层经历了压实、胶结、交代和溶解等作用。胶结作用起到影响次生孔隙的双重作用，方解石、白云石和粘土矿物与次生孔隙发育关系密切；溶解作用促进了次生孔隙的产生．、成岩阶段分为中A1、中A2、中B三期，随着有机质的成熟和粘土矿物的转化形成了酸性地层水介质．使得不同层段发育有两个次生孔隙带，这些是较好储层物性的有利条件。

The diagenesis and secondary porosity development characteristics in the Shasishang of Dongfenggang Oilfield were analyzed through analysis and test of coring, thin section observed under the microscope, fluid inclusion homogenization temperature measurement and scanning electron microscope and other technical means. The strata of this area have undergone compaction, cementation, replacement, and dissolution, etc. The cementation has played dual roles in impacting the secondary porosity. Calcite, dolomite and clay minerals are closely related to secondary porosity development. Dissolution promoted the emergence of the secondary pores. Diagenetic stage is divided into three phases： the Zhong A1, Zhong A2, and Zhong B. acidic formation water medium formed with the conversion of organic matter maturity and clay minerals, making two secondary porosity belts developed in different layers. These are favorable terms for good reservoir properties.