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致密砂岩储层的孔隙结构对渗透性和电性的影响显著,是此类复杂储层岩石物理研究的关键。针对仅从连通吼道半径评价渗透率的多解性及储层孔隙结构与电性关系研究欠缺等不足,综合影响物性的主要因素,我们提出了一种同时考虑渗透率、最大连通吼道半径及分选性三种因素的新型孔隙结构参数δ评价致密砂岩的渗透性和电性。利用岩心及实测数据对比分析表明:δ值能够较连通喉道半径等传统方法更精确地刻画致密砂岩储层的渗透性,同时与储层电性有密切关系,可用于估算地层因子F及胶结指数M,因此提出将孔隙结构对电阻率的影响进行归一化校正用来突出流体类型Rt的影响,极大地提高了Picket交会图的相关性。
The pore structure of tight sandstone reservoirs has significant influence on permeability and electrical properties, which is the key of the petrophysical research of such complex reservoirs. Considering the multi-solution of permeability and the lack of researches on the relationship between reservoir pore structure and electrical conductivity only from the radius of the connected rover, we propose a method that considers both permeability and maximum connected roar radius And sorting of three kinds of factors of the new pore structure parameter δ evaluation of tight sandstone permeability and electrical properties. Comparisons of core and measured data show that δ can describe the permeability of tight sandstone reservoirs more accurately than conventional methods such as connected throat radius and is closely related to reservoir electrical properties and can be used to estimate formation factor F and cementation Index M, it is proposed to normalize the effect of pore structure on the resistivity to highlight the effect of fluid type Rt, greatly improving the correlation of the Picket cross plot.