鄂尔多斯盆地下寺湾地区延长组储层特征研究

为了探明鄂尔多斯盆地下寺湾地区延长组储层储集性能,针对研究区储层非均质强,纵向上岩性、含油性变化快,自然产能低等问题,基于铸体薄片、孔渗、压汞等实验分析,开展岩石学、物性、孔隙类型及结构、成岩作用等方面研究.结果表明:研究区延长组岩石类型以长石岩屑砂岩和长石砂岩为主,长石含量占30％以上,平均孔隙度为7.03％,平均渗...

Research of reservoir characteristics of Yanchang Formation in Xiasiwan Area,Ordos Basin

In order to explore the reservoir properties of Yanchang Formation in Xiasiwan Area,Ordos Basin,reservoir property in the study area on the strong reservoir heterogeneity,the vertical lithology,oil content change fast,natural low capacity,based on the permeability of the casting thin sections,and mercury injection experiments analysis,lithology,physical properties,pore types and structure,diagenesis,etc.The results show that the rock types of Yanchang Formation in the study area are mainly feldspar lithic sandstone and feldspar sandstone,the content of feldspar is more than 30%,the average porosity is 7.03%,the average permeability is 0.285×10^-3μm²,and it belongs to low porosity and low permeability reservoir.The type of reservoir space is mainly intergranular pores,accounting for 59%,followed by feldspar solution pores.Sedimentary environment and diagenesis are two important factors that determine reservoir performance,and multiple factors affect reservoir development at macro and micro levels respectively,among which the understanding of sedimentary microfacies is particularly important,and its distribution characteristics determine reservoir distribution.The above results provide a reference for the effective utilization of the difficult-to-produce reserves and the prediction of favorable areas in the study area.