摘要
大斜度井中的感应测井响应计算是测井理论研究工作的一个重要课题。对此领域内国内外专家学者的工作做了简单的总结,主要分两个方面:解析方法研究和数值模拟计算。解析方法研究主要是利用矢量分解法求取地层中电磁场分布的解析解,然后通过快速傅里叶-汉克尔变换计算数值解。数值模拟计算主要利用Yee提出的交错网格,结合有限差分法求解电磁场分布,进而求取感应测井响应。数值模拟方法可用于计算比较复杂的地层。借助解析或半解析方法,可使计算量和存储量降低。采用非正交坐标系可不用考虑电磁场的分解与叠加,减少网格数量,使理论研究方便快捷。
The calculation of induction logging response in highly deviated wells is an important topic in well logging field. This paper summarized the achievements of induction well response calculation mainly by analytic method and numerical simulation. The analytic method involves calculating analytic solution of the electromagnetic field in a formation by vector decomposition and numerical solution of logging response by fast Fourier-Hankel transformation. The numerical simulation method calculates the distribution of electromagnetic field by Yee's staggered grid finite difference method and then further determines the responses of induction logging. The numerical simulation method is suitable for complex formations, whereas the analytic method or semi-analytic method is superior in less computation and storage costs. Using nonorthogonal coordinates system can avoid the decomposition and composition of electromagnetic field, and reduces the quantity of grids.
出处
《勘探地球物理进展》
2005年第2期97-101,共5页
Progress in Exploration Geophysics
