苏里格气田苏西区块上古生界天然气储层特征

Gas Reservoir Featrues of the Upper Paleozoic in the West of Sulige Area

从储层的岩石学类型、孔渗特征、孔隙结构类型和储集空间等方面分析苏里格气田苏西区块上古生界天然气储层特征。通过实验室铸体薄片鉴定、岩心物性测试、孔隙图像、扫描电镜以及高压压汞等方法测试研究,结果表明该区上古生界盒8、山1、山2储层以岩屑石英砂岩为主,其次为石英砂岩和岩屑砂岩;储层均属于特低孔超低渗储层;储集空间类型主要为粒间孔、晶间微孔以及粒内溶孔,研究区主要的孔隙结构组合是"溶孔+微孔"型;储层孔喉连通性较差,孔喉连通性较差又直接影响了该区上古生界的储层质量。

Gas reservoir characteristics of the upper palaeozoic are realized in terms of petrologic features,characteristics of physical property; reservoir space types; pore structure and so on in the study area. Laboratory casting slice identification,rocks core properties,pore image,scanning electron microscopy analysis and high pressure mercury test analysis. The results showed that the reservoir of He- 8,Shan- 1 and Shan- 2 Member mainly include lithic quartz sandstone,quartz sandstone and lithic sandstone in the upper palaeozoic; the reservoir of upper palaeozoic belongs to special- low porosity and super- Low permeability reservoir; intergranular pores,dissolved pores in grains and intergranular micropores are composed of primary reservoir space types. Meanwhile,the most common pore assembly type is ＂dissolution pore ＋ microporosity type＂in the study area; the reservoir has poor connectivity between pore throats,while reservoir quality of the upper palaeozoic is directly influenced by the poor connectivity in the study area.