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鄂尔多斯盆地志丹南部地区有较好的天然气勘探前景。本文通过岩心观察,镜下薄片分析、压汞成像分析等手段,进行了储层的岩石学特征、储集空间和物性特征研究,并对储层进行了分类和评价。研究认为:志丹南部地区马家沟组马五段上部地层,以岩溶高地和岩溶斜坡为主。岩心易破碎,岩石类型主要为白云岩、石灰岩和泥灰岩。储集空间以晶间孔隙和晶间溶孔为主。孔隙度和渗透率较低,孔渗相关性差。储集性能较好的储层为特低孔低渗储层。
Ordos Basin southern Zhidan better prospects for natural gas exploration. In this paper, the petrological characteristics, reservoir space and physical properties of reservoirs are studied by means of core observation, microscopic thin slice analysis and mercury intrusion imaging analysis. The reservoirs are classified and evaluated. The study shows that the upper strata of Ma-5 Member in Majiagou Formation in southern Zhidan are dominated by karst highlands and karst slopes. Core is fragile, the rock types are mainly dolomite, limestone and marl. The storage space to intergranular pores and intergranular dissolved pores. Low porosity and permeability, poor permeability correlation. The reservoirs with good reservoir performance are ultra-low porosity and low permeability reservoirs.