地层因素对自然电位测井响应影响的定量研究

Quantitative Analysis of Effects of Various Factors on SP Log

摘要: 根据自然电动势的形成机理建立了二维轴对称非均匀介质中自然电位测井的分析模型,利用数值模式匹配(NMM)理论与表面积分方程法相结合对自然电位测井响应进行了严格的数值模拟,并定量考察了诸如地层水和泥浆滤液含盐浓度、地层厚度、井径、侵入带等因素对自然电位测井响应的影响。自然电位测井数值模拟的实现必将为测井解释提供依据,对实际测井工程有指导作用。

Abstract: In this paper, the numerical mode matching theory and surface integral equation method are applied to analyze the response of the SP log.The factors include concentration of connate water and mud filtrate, bed depth, borehole diameter, invasion etc.The method can be used to analyze the SP response in coaxial 2-D arbitrary inhomogeneous formation.