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通过铸体薄片、扫描电镜、高压压汞等分析化验手段,对鄂尔多斯盆地南部本溪组储层特征进行综合研究。结果表明,障壁岛-泻湖沉积是研究区本溪期主要的沉积相类型之一,本溪组气藏储层为潮道砂体和障壁砂坝砂体,含气砂体不受局部构造控制,为岩性气藏。该区本溪组储层岩性主要为中-粗粒石英砂岩,少量细砂岩和砾岩。根据分析结果本溪组储层孔隙度平均为2.9%,渗透率平均为0.8141×10-3μm2,表明储层属于特低孔-特低渗储层。储集空间主要以原生粒间孔隙和粒间孔为主,其次为长石溶孔,喉道类型主要以微喉道为主。
The characteristics of Benxi reservoir reservoirs in the southern Ordos Basin are comprehensively studied by means of analytical instruments such as cast thin films, scanning electron microscopy and high pressure mercury intrusion. The results show that the barrier island-lagoon sedimentation is one of the main sedimentary facies in Benxi period in this study area. The reservoir of Benxi Formation is tidal channel sand body and barrier sand bar body. The gas-bearing sand body is not controlled by local structure and is Lithologic gas reservoir. The lithology of Benxi Formation reservoir in this area is mainly medium-coarse grain quartz sandstone, a small amount of fine sandstone and conglomerate. Based on the analysis result, the average porosity of Benxi Formation reservoir is 2.9% and the average permeability is 0.8141 × 10-3μm2, indicating that the reservoir belongs to the ultra-low porosity and ultra-low permeability reservoir. The main reservoir space is mainly primary intergranular pores and intergranular pores, followed by feldspar dissolved pores. The throat type is mainly dominated by micro throats.