水平层状介质中侧向电阻率测井快速迭代反演与应用  

THE FAST NONLINEAR INVESION OF LATEROLOG FOR THE HORIZENTAL LAYERS AND ITS APPLICATION

作　　者：汪宏年[1,2] 杨善德[1,2] 常明澈 

机构地区：[1]吉林大学物理系 [2]大庆测井公司

出　　处：《地球物理学进展》1998年第4期97-108,共12页Progress in Geophysics

基　　金：九五国家科技攻关项目

摘　　要：侧向电阻率测井由于具有较好的探测深度和较高的纵向分辨率而成为油储地球物理测井中的一种重要方法，是确定储层中油气含量的最主要手段．然而，当地层的厚度小于其纵向分辨率时，由于受井眼泥浆和上下围岩等的影响，实测的视电阻率已无法反映地层电阻率的真实变化，给油气层的划分及油储层的定量评价带来了极大的困难，因此，研究侧向电阻率测井反演不论在理论上还是实际应用上均有非常重要的意义．本文首先通过摄动原理给出了层状介质中侧向电阻率测井的Ｂｏｒｎ近似解，并应用混合法得到的电场半解析解，研究了快速计算Ｂｏｒｎ近似的新方法，然后通过拟牛顿法给出了逐步修改地层模型的迭代反演算法．为证明该方法的有效性，以大庆的高分辨率三侧向测井仪为例，给出了理论模型与实际井场资料的处理结果．Laterolog is the important method of the reserviors geophysical well logings due to the good exploration depth and high vertical resolution. It is mainly to evaluate the quantity of oil and gas in the reservior. However,when the bed thickess is less than the vertical resolution,measured apparent resistivity cant properly respond to the formation resistivity as the result of affection of well mud and shoulder beds. It becomes to dificult to correctly evaluate the bed. So it is important to study the inverse of Laterolog in both theory and application. In the paper,Borns approximatic formular of Laterolog is given using perturbation principle. The fast algorithm to compute the Borns approximate is studied using the semianalystic expression of the mixed approach. And the procedure of nonlinear inversion is givven using the modefied Neutons method. Finally,in order to examine the effectiveness of the algorithm,the inversion results of theory modles and well field real datum are given

关 键 词：Born近似解 迭代反演 测井 水平层状介质 电阻率 

分 类 号：P631.811[天文地球—地质矿产勘探]