特低渗透率砂岩储集层电学性质研究

Electrical Property Analysis on Especially Low-permeability Clastic Reservoir

依据歧口沙河街组和白豹延长组的样品配套岩石物理实验为基础,通过考察平均孔喉比、孔喉分选系数等参数与电阻率之间的相关性,指出平均孔喉大小比值、不同大小孔喉分选系数是影响特低渗透率储层渗流与电性的2个重要参数,提出了基于渗透率校正和基于孔喉分选系数校正的孔隙结构校正方法。这2种校正模型能够降低孔隙结构的影响,进一步突出流体信息,为饱和度模型研究奠定基础。

Resistivity of the clastic reservoir with especially-low permeability is mainly determined by it＇s pore-structure with undefined quantified model. Based on some assorted experitmental results of 28 samples from Shahejie Formation in Qikou Sag and Yanchang formation in Baibao Erdos, we have found that the average ratio of pore-throat size, and the sorting coefficient of pore throat size, are responsible for the permeability and resisivity. Then an idea of resistivity correction by permeability and sorting coefficient is provided to reduce the influence from pore-structure, which will be the base for saturation equation research.