基于岩石电性参数频散特性评价润湿性的实验方法研究

岩石电性参数频散特性与润湿性之间存在着密切的关系，在油驱水、水驱油的岩石电性参频散特性的实验中，不同润湿性岩石，其复电阻率模值频散率P_ρ和相位频散率P_φ随含水饱和度变化曲线的斜率k不同，亲油岩石的斜率k最大，中性润湿的岩石次之，亲水岩石的斜率k最小，其中油驱水相位频散率P_φ的斜率k与岩石润湿性的关系表现得最为明显.因此，可以利用油驱水相位频散率P_φ的斜率k定性的评价储层岩石的润湿性.

An experimental study of wettability evaluation based on frequency dispersion property of rock electric parameters

A close relationship exists between the rock wettability and the rock′s electrical parameter dispersion properties. In the tests of studying rock′s electrical parameter dispersion properties in both processes of oil displacing water and water displacing oil, it is found that for rocks with different wettabilities, the slopes k of curves P_ρ versus S_w and P_φ versus S_w are variable, where P_ρ refers to complex resistivity modulus dispersion ratio, P_ρ refers to phase dispersion ratio, and S_w represents water saturation. The maximum k is acquired in oil-wet rocks, the minimum k is appeared in water-wet rocks, and k with medium values exist in intermediate wettability rocks. The most obvious relationship is shown between k of P_φ and rock wettability. In oil displacing water process. Therefore, the slope k of phase dispersion ratio P_φ in oil displacing water process could be used to qualitatively evaluate reservoir rock wettability.