对利用自然电位曲线求取地层混合液电阻率的方法进行研究 ,对实际生产中影响自然电位曲线的多种因素 (井径、层厚、泥浆侵入、泥质含量、过滤电位、含油性等 )逐项进行分析 ,并提出相应的校正方法。现场应用效果表明 ,该校正方法能够提供科学可靠的地层混合液电阻率值 ,从而使剩余油饱和度数值更趋准确 In this paper, the method of determining the resistivity of formation mixture by natural potential curve is studied. The factors influencing the curve of natural potential (such as well diameter, layer thickness, mud invasion, mud content, filtration potential, oiliness, etc.) Analyze items one by one, and propose corresponding correction methods. The field application shows that the calibration method can provide a scientific and reliable formation fluid resistivity value and thus make the remaining oil saturation values ​​more accurate