稠油油藏注超临界多元热流体开发效果明显优于蒸汽驱，但目前注超临界多元热流体地下渗流规律尚不明确。为此，通过“高温高压稳态法”得出不同温度下油-水、油-气相对渗透率曲线，并测试不同温度下油-水相对渗透率实验的采出稠油黏度及油砂与水的接触角，最后结合油-水、油-气两相相对渗透率和Stone-Ⅱ预测模型得出三相渗流时不同热区的油相等渗图。结果表明，稠油经超临界水作用后，测得的采出稠油黏度在50 ℃时相比于蒸汽减少了31.03%，油砂与水的接触角从139.5°降低至100.9°，油砂润湿性向亲水方向发展。相比于油相相对渗透率，水相相对渗透率极小，油-水相对渗透率曲线特征值随温度的升高先逐渐变化，后在超临界时发生突变；油气相对渗透率随温度的升高而逐渐增大。在油相等渗图中，随着温度的升高，油相流动区面积逐渐增大，超临界时流动区面积增加到54.59%，油相流动能力显著增强。研究结果可为稠油油藏注超临界多元热流体在储层中的渗流机理和数值模拟提供理论依据。

The performance of supercritical multi-thermal fluid injection in heavy oil reservoirs is markedly superior to that of steam flooding. However, the underground seepage law of injecting supercritical multi-thermal fluid is not yet clear. Therefore, the "high-temperature and high-pressure steady-state method" was proposed to test the oil-water and oil-gas relative permeability curves at different temperatures. The viscosity of produced heavy oil and the contact angle between oil sand and water at different temperatures were tested, and finally, combined with the oil-water, oil-gas relative permeability and Stone-Ⅱ prediction model, the isoperms of oil phase relative permeability in different hot areas during three-phase seepage were obtained. The results show that after the action of supercritical water on heavy oil, the measured viscosity of produced heavy oil decreased by 31.03% at 50 ℃ compared to steam, and the contact angle between oil sand and water decreased from 139.5° to 100.9°, indicating that the wetting properties of the oil sand develop towards a water-wet direction. Compared with the relative permeability of oil phase, the relative permeability of water phase is very small, and the characteristic value of oil-water relative permeability curve changes gradually and then suddenly at supercritical temperature. The relative permeability of oil-gas increases gradually with the increase of temperature. In the isoperms of oil phase relative permeability, the area of the oil flow zone expanded as temperatures rose, and under supercritical conditions, the flow zone area grew to 54.59%, highlighting a significant enhancement in oil-phase flow capacity. The research results of this paper can provide theoretical basis for the seepage mechanism and numerical simulation of supercritical multi-thermal fluid injected in heavy oil reservoirs.