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鄂尔多斯盆地波罗池南地区勘探程度相对较低,勘探潜力较大,基础地质研究薄弱。利用岩心、测井和多种分析测试资料,对长8砂岩储层岩石学、储集物性及孔隙结构等特征进行系统综合研究。结果表明:长8储层岩性主要为岩屑长石砂岩和长石岩屑砂岩,可见少量的长石砂岩和岩屑砂岩,分选性中等-较好,磨圆度中等-较差。剩余粒间孔和溶蚀孔隙是该地区的主要孔隙空间。械压实作用、胶结作用及交代作用对储层孔隙起着破坏性作用,溶蚀作用和溶解作用起着使储层孔隙增大的作用。裂缝的存在有两方面的作用,即有改善油气运移通道的建设性作用,又有破坏储层,使油气逸散的破坏性作用。
The exploration in the polo-chi-nang area of Ordos Basin is relatively low in exploration potential and exploration of basic geology is weak. Based on the core, logging data and many kinds of analysis and test data, the paper systematically studied the petrology, reservoir properties and pore structure of Chang 8 sandstone reservoir. The results show that the lithology of Chang 8 reservoir is lithic feldspar feldspar and feldspathic lithic sandstone. A small amount of feldspathic sandstone and lithic sandstone are observed with medium-good sorting and moderate-poor roundness. The remaining intergranular pores and dissolved pores are the major pore spaces in the area. The mechanical compaction, cementation and metasomatism play a destructive role on the reservoir porosity. The dissolution and dissolution play the role of increasing the porosity of the reservoir. The existence of cracks has two functions, namely, to improve the constructive function of hydrocarbon migration channels and to destroy destructive reservoirs to make oil and gas escape.