To solve the problem that the law of rock electrical response under low and medium water saturation in tight sandstone reservoirs is not clear, an experimental method of high-speed centrifugal displacement rock electricity and nuclear magnetic resonance T₂ spectrometry under different water saturation was proposed, which can drive the tight sandstone cores with the permeability less than 0.1×10⁻³ μm², and provide a reliable experimental means for the study of tight sandstone electrical property. By carrying out supporting experiments such as high-resolution CT scan, MAPS and Qemscan, a multi-mineral component fine three-dimensional digital core based on multi-source information fusion was constructed. The finite element numerical simulation method was used to obtain the electrical response of tight sandstone core with low water saturation which cannot be obtained in laboratory conditions. By combining experiment and numerical simulation, the electrical response laws have been clear of tight sandstone with complex pore structure, and the saturation evaluation method of variable rock electrical parameters based on pore structure has been developed. The processing of logging data of multiple wells in tight sandstone reservoir of Chang 7 Member in the Ordos Basin shows that this method can obtain more accurate oil saturation, and provides a new idea and method for fine logging evaluation of tight sandstone reservoir.

为解决致密砂岩储层中低饱和度时岩石电响应规律不明确的问题，提出了一种在不同饱和度下高速离心位移岩电和核磁共振T ₂光谱法的实验方法，其可以与渗透性驱动紧砂岩岩心大于0.1×10以下^-3微米²，为研究致密砂岩的电学性质提供了可靠的实验手段。通过进行高分辨率CT扫描，MAPS和Qemscan等辅助实验，构建了基于多源信息融合的多矿物成分精细三维数字核。利用有限元数值模拟方法获得了含水饱和度低的致密砂岩岩心的电响应，这在实验室条件下是无法获得的。通过实验与数值模拟相结合，清除了具有复杂孔隙结构的致密砂岩的电响应规律，建立了基于孔隙结构的可变岩石电参数饱和度评价方法。