苏里格气田苏6区块致密砂岩储层特征及成岩储集相

Characteristics and Diagenetic Reservoir Facies of Tight Sandstone Gas Reservoirs in Sulige Gas Field

苏里格气田盒8段储层为致密砂岩储层,储层物性较差,有效储层的成因机理复杂。对研究区砂岩储层的基本特征进行了分析,在此基础上将研究区成岩储集相划分为4类,其中:Ⅰ类和Ⅱ类成岩储集相残余原生粒间孔和溶蚀孔隙较发育,物性最好;Ⅲ类成岩储集相以晶间孔为主,物性较差;Ⅳ类成岩储集相孔隙不发育。通过成岩储集相的纵向和平面分布特征研究表明:Ⅰ类和Ⅱ类成岩储集相主要分布在水动力较强的辫状河心滩微相中;Ⅲ类成岩储集相发育在辫状河高能水道心滩微相的顶底部和低能水道心滩微相中;Ⅳ类成岩储集相主要分布在河道侧缘及河床底部滞留沉积微相中。

The He 8 Reservoir of Sulige Gas Field was a typical tight gas sandstone reservoir with poor physical property and complex reservoir genesis.The basic characteristics of tight reservoir in the studied area were first analyzed.On the basis stated above,the diagenetic reservoir facies were divided into 4 types.In TypesⅠ-Ⅱ there developed residual and primary intergranular pores and dissolution pores with best physical property.In Type Ⅲ,there mainly developed intercrystal pores with poor physical property,while in Type Ⅳ,there were no pore development.The study of vertical and plane distribution of diagenetic reservoirs shows that TypesⅠ,Ⅱare mainly distributed in channel bars of braid river,and Type Ⅲ is distributed on the top and base of main channel bars,as well as secondary channel bars.Type Ⅳ is distributed on the side edge and lag deposit facies.