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通过研究区内大量物性资料及铸体薄片分析,对吴起地区长9油层组储层的岩石学特征、孔渗特征、孔隙结构及孔隙类型等进行深入研究。结果表明,吴仓堡地区长9油层组岩性主要为岩屑长石砂岩,具有低成分成熟度、圆度次棱、分选好的特点;孔隙度平均值为7.9%,变化于4.1%~11.6%之间,渗透率介于0.045×10-3μm2~0.383×10-3μm2之间,平均值为0.128×10-3μm2,属于特低孔、特低渗储层。
Through the analysis of a large number of physical data in the study area and the analysis of cast thin sections, the petrological characteristics, porosity and permeability characteristics, pore structure and pore types of Chang 9 reservoir in Wuqi area are studied in depth. The results show that the lithology of Chang 9 reservoir in Wucangpu area is mainly lithic feldspar feldspar sandstone with the features of low component maturity, roundness and secondary edge, well sorted; the average porosity is 7.9%, varying from 4.1% ~ 11.6%. The permeability is between 0.045 × 10-3μm2 ~ 0.383 × 10-3μm2 with the average value of 0.128 × 10-3μm2, belonging to the ultra-low porosity and ultra-low permeability reservoirs.