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鄂尔多斯盆地存在大量的低孔低渗透性油层,低渗透油层的孔隙细小、结构复杂,孔隙结构的复杂性对驱油效率的影响很大。分别对研究区的地质概况、四性关系及孔隙度解释模型进行分析,对研究区孔隙度进行评价。研究表明当孔隙度大于10%时,含油的岩心占98.5%,同时也说明当孔隙度小于10%时,岩心几乎不含油。对该区的研究结论是该区的孔隙度下限值为10.0%。
There are a large number of low porosity and low permeability reservoirs in the Ordos Basin. The pores of the low permeability reservoirs are small and the structure is complicated. The complexity of the pore structure has a great influence on the displacement efficiency. The geological survey, the relationship between the four sexes and the porosity interpretation model of the study area are respectively analyzed to evaluate the porosity of the study area. Research shows that when the porosity is greater than 10%, the oil-bearing core accounts for 98.5%, and also shows that the core contains almost no oil when the porosity is less than 10%. The study of this area concluded that the lower limit of porosity in this area is 10.0%.