鄂尔多斯盆地靖边油田马宁区长2油层组储层特征研究

目前针对靖边油田马宁区长2油层组储层特征研究不足，导致马宁区进一步的勘探开发受到局限.本次研究根据岩心观察、薄片鉴定、孔渗分析、扫描电镜及压汞实验等资料，在研究区长2油层组储层特征研究的基础上，对储层质量进行了有效的分类评价.研究表明，靖边长2油层组储层以中细粒长石砂岩为主；杂基主要由水云母、绿泥石膜组成，胶结物主要为方解石、硅质、白云石；主要储集空间为次生粒间孔.储层砂岩孔喉连通性较好，且分选性较好.总体上马宁地区长2油层组储层由于受岩性、成岩等作用影响，表现中低孔、中低渗储层特征.

CHARACTERISTICS OF THE C-2 RESERVOIR IN MANING AREA OF ORDOS BASIN

Due to the lack of research on sedimentary microfacies and reservoir characteristics of Maning area in Jingbian oilfield, Ordos Basin, the exploration and development in the area is limited at present. Based on core observation, thin section analysis, physical testing, scanning electron microscopy and mercury intrusion curve data, the reservoir characteristics are studied and the reservoir quality is classified. The results show that the C-2 reservoir in Maning area is dominated by fine-grained feldspathic sandstone, with matrix primarily composed of hydromica and chlorite, cemented by calcite, silica and dolomite. The main reservoir spaces are intergranular dissolved pores and ethylene pores. The pore throat of the sandstone reservoir has good connectivity and sorting. The C-2 reservoir formation in Maning area is characterized by low-medium permeability and low-medium porosity.