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鄂尔多斯盆地志丹南部地区山西组气层多,厚度大,是延长气田的主力产层之一。以分析化验、镜下观察和数学统计为主要手段,分析该区山西组储层的岩石学特征、孔隙特征和物性特征,结果表明,该地层为致密储层,孔隙类型多样,原生孔隙主要为残余粒间孔;次生孔隙为溶蚀粒间孔、溶蚀粒内孔、铸模孔和微裂缝。山西组储层平均孔隙度为5.19%;平均渗透率为0.16×10-3μm2,是一套低孔低渗储层。
The gas formation in Shanxi Formation in southern Zhidan of Ordos Basin is large with a large thickness and is one of the main pay zones in Yanchang Gas Field. The analysis of laboratory tests, microscopic observations and mathematical statistics as the main means to analyze the petrological characteristics, pore characteristics and physical properties of the Shanxi Formation reservoir, the results show that the formation is a tight reservoir, the pore types are diverse, the primary pore Residual intergranular pores; secondary pores are intergranular pores, erodible pores, mold pores and micro-cracks. The average porosity of Shanxi Formation is 5.19%. The average permeability is 0.16 × 10-3μm2, which is a set of low porosity and permeability reservoirs.