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为研究陕北斜坡东部上古生界的储层特征,利用薄片、粒度、压汞、物性等资料,对储层的岩石学、孔隙结构、物性等特征进行分析。结果表明:储层砂岩主要为石英砂岩、岩屑砂岩以及二者之间的过渡类型;孔隙类型主要有原生孔隙、残余粒间孔隙、溶蚀粒间孔隙、溶蚀粒内孔隙、溶蚀填隙物内孔隙、自生矿物晶间孔隙和少量的微裂缝性孔隙;砂岩总体上孔隙结构较差,储集性能不好;沉积作用对研究区砂岩储层孔隙度、渗透率影响较大,储层成岩作用影响略弱于沉积作用,构造运动影响更为有限;按照毛细管压力曲线建立的储层类型及其总体对应的测井相特征、相带类型和物性资料结合,建立起一套与孔喉结构相关的储层评价指标。
In order to study the characteristics of reservoirs in the Upper Paleozoic of the northern slope of northern Shannxi, the petrology, pore structure and physical properties of the reservoirs are analyzed by using the information of thin slices, grain size, mercury intrusion and physical properties. The results show that the reservoir sandstones are mainly quartz sandstone, lithic sandstone and the transitional type between the two. The types of pores are primary pore, residual intergranular pore, dissolved intergranular pore, dissolved intragranular pore and dissolved interstitial Porosity, intergranular pores of authigenic minerals and a small amount of micro-fractured pores. Sandstone generally has poor pore structure and poor reservoir performance. Sedimentation has great influence on the porosity and permeability of sandstone reservoirs in the study area, and diagenesis of reservoirs The effect is a little weaker than the sedimentary effect and the tectonic movement is more limited; according to the reservoir type established by the capillary pressure curve and its corresponding logging facies, facies type and physical property data, a set of pore-throat structure is established Reservoir evaluation index.