鄂尔多斯盆地直罗油田长2储层特征

鄂尔多斯盆地直罗油田长2储层主要沉积相为三角洲相沉积,水下分流河道为其主要的油气储集层,长2储层岩性主要为岩性以细-中粒长石砂岩为主,其次为细-粉粒长石砂岩,矿物成熟度低。主要储集空间为由溶蚀粒间孔、原生粒间孔和微孔隙组成的复合孔,以残余的溶蚀粒间孔为主,微孔隙少量。储层主要为中低孔、特低渗储层,非均质性较强。较强的压实作用、胶结作用是形成低孔低渗的主要因素,而溶蚀作用是储层物性改善的主要因素。

The Chang 2 Reservoir Characteristic of Zhiluo Oil field in Ordos Basin

Delta sediments are the main deposits in the Chang 2 oil beds of Yanchang Formation in Zhiluo area of the Ordos Basin and the sand bodies of distributary channel and subaquatic distributary channels are main reservoirs for the hydrocarbon.Fine lithic arkose sandstone and fine arkose sandstone are main sandstones of the Chang 2 reservoir.Dissolution porosity is less developed,the main reservoir in the grounds of dissolution of intergranular pore space,the original intergranular pores and micro-porous composite hole to hole remnants mainly intergranular corrosion,a small amount of micro-pores.Mainly in low porosity reservoirs,low permeability reservoir.Strong heterogeneity.Study area,strong compaction,cementation is the formation of low porosity and permeability of the main factors,while dissolution is the reservoir of the main factors to improve.