鄂尔多斯盆地东南部宜川地区本溪组储层特征及综合评价

Reservoir Characteristics and Comprehensive Evaluation of Benxi Formation in Yichuan Area,Southeast of the Ordos Basin

鄂尔多斯盆地宜川地区上石炭统本溪组主要为障壁岛与泻湖沉积,发育中-粗粒砂岩储层.通过岩心铸体薄片鉴定、毛管压力数据以及孔隙度、渗透率资料分析发现,本溪组砂岩储层以次生溶孔和晶间孔为主,排驱压力均值为0.51MPa,喉道中值半径的均值为0.926μm,孔隙度和渗透率较低,属于低孔低渗的致密性储层.并结合测井解释结果和试气成果,建立储层分类评价标准,综合评价本溪组障壁岛储集层总体较好,局部发育较差.

The upper carboniferous benxi formation in Yichuan area ol the Ordos Basin is mainly composed ol barri-er and lagoon sedimentary and developing medium - coarse sandstone reservoirs. The Benxi sandstone reservoirs are mainly composed ol secondary dissolution pores and intergranular pores by the identilication ol core castings thin sections, capillary pressure data and porosity and permeability data. The average displacement pressure is 0.51MPa, the mean value of throat median radius is 0.926^m, and the porosity and permeability are low, which belongs to the low porosity and low permeability reservoir. On the basis of core test and analysis, combined with logging interpretation results and gas test results, the reservoir classification and evaluation criteria are established. It holds that the reservoir stratum of Benxi formation is excellent to ta l ly, and parts worse.