克拉玛依油田八区佳木河上亚组储层孔隙结构特征及分类

RESERVOIR PORE STRUCTURE CHARACTERISTICS AND CLASSIFICATION FOR THE UPPER SUBFORMATION OF JIAMUHE FORMATION OF BLOCK 8 IN KARAMAY OILFIELD

孔隙结构是影响储层孔隙度、渗透率的重要因素，无论是在油气二次运移过程中油气驱替孔隙中的地层水时，还是油气在开发过程中从孔隙中被驱替出来时，都受孔隙结构所控制。采用薄片鉴定、压汞分析、扫描电镜等实验测试技术，对克拉玛依油田八区佳木河组储层微观孔隙结构特征进行了详细研究。研究结果表明，八区佳木河上亚组储层物性整体上属于中孔低渗～特低渗储层，孔隙以原生晶间孔、粒内溶孔、胶结物内溶孔为主，属于中小孔、微细喉道类型，喉道分选性差，均质性相对较差，连通性一般。通过对各类孔隙结构特征参数的相关性分析，选取有效孔隙度与渗透率作为孔隙结构主分类参数，对八区佳木河上亚组储层孔隙结构进行分类，共分为三大类、五个亚类。其中，I-1亚类储层孔隙结构最优，Ⅱ类储层孔隙结构中等偏下和Ⅲ类储层孔隙结构极差。

Pore structure has an important effect on porosity and permeability of reservoir.Whether in the oil gas secondary migration of oil and gas during the two flooding in the pore formation water,or oil and gas in the process of developing from the pores are flooding out,they are affected by the pore structure.Using thin section identification,mercury intrusion analysis,scanning electron mictoscope test technology of Karamay Oilfield,block 8 JiaMuHe group reservoir microscopic characteristics of pore structure are studied in detail.Research results show that,Block 8 on the subgroup of JiaMuHe reservoir overall belongs to medium porosity and low permeability and extra-low permeability reservoir,The pores mainly belong to original intercrystal pores,intragranular dissolved pores,cements in dissolution pores,with small,fine throat,and throat sorting is relatively poor with relatively poor heterogeneity and poor connectivity in general.Based on all kinds of characteristic parameters of pore structure correlation annlyses,chosing effective porosity and permeability as the main classification of pore structure patameters in block 8 of the upper formation of JiaMuHe formation,the classifications of pore structure of the reservoir are divided into three categories,five sub-categories,in which,pore structure of class I-1 subclass reservoir is optimal,class II is in lower middle and the pore structure of class III reservoir is very poor.