复杂地层中自然电位测井的高效数值模拟  

High-efficient numeric simulation of spontaneous potential log in complex beds.

作　　者：潘克家[1,2] 谭永基[2] 

机构地区：[1]中南大学数学科学与计算技术学院,湖南长沙410075 [2]复旦大学数学科学学院

出　　处：《石油地球物理勘探》2009年第3期371-376,共6页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(10431030);上海市自然科学基金项目(08ZR1401100)资助

摘　　要：自然电位测井是石油勘探中探测地层物理参数的重要手段。针对近年来出现的侵入带电阻率渐变和水淹层等复杂地层模型,本文建立了基于连续侵入的自然电位测井的数学模型,提出了一种捕捉交界面电位跳跃的有限差分方法。该方法非常简单,易于计算机编程实现。利用该方法定量分析了目的层电阻率、地层厚度、井径、侵入带和水淹层等因素对自然电位测井响应的影响,取得了满意的结果。复杂地层自然电位测井数值模拟的实现为测井解释提供了依据,对实际测井工程具有一定的指导意义。Spontaneous potential log is important tool for surveying physical parameters of beds in petroleum exploration. With respect to such complex stratigraphic model as continuously-changing resistivity model in invasion zone and water-flooded zone, the papper created the math model of spontaneous potential log based on continuous invasion and presented finite-difference algorithm capturing potential jump at interface, which is characterized by simple and easy to realization by programming in computer. Using the method to quantitatively analyze the influence of resistivity, of target, bed thickness, well diameter and invasion and water-flooded zones on spontaneous potential log response achieved satisfied results. The realization of numeric simulation of spontaneous potential log for complex beds provided the basis of logging interpretation and has a certain guide meaning for practical logging engineering.

关 键 词：自然电位测井 水淹层 有限差分法 侵入带 数值模拟 

分 类 号：P631.811[天文地球—地质矿产勘探] P634.5[天文地球—地质学]