一、引言 本文继《环自然电位测井理论分析》一文,探讨了非均质油层水淹后,地层水矿化度变化的规律,提出了局部水淹和多级水淹两种模式,得出了扩散电动势的纵向变化规律,应用分层迭加的办法推出了静态条件下非均质油层水淹后环自然电位的理论公式。通过计算机计算,绘制了各种水淹状况和水淹程度下,不同层厚的环自然电位的理 I. INTRODUCTION Following the article “Theoretical Analysis of Ring Natural Potential Well Logging”, this paper discusses the law of the variation of salinity of formation water after the inhomogeneous reservoir flooding, and proposes two models of partial flooding and multi-stage flooding Based on the longitudinal variation law of the diffusion electromotive force, the theoretical formula of the natural potential of the ring after the flooding of the heterogeneous oil layer under static condition is put forward by the method of layering and superposition. By computer calculation, draw a variety of flooded conditions and the degree of flooding, the natural layer of different ring thickness of the rationale