电阻率成象测井有限元分析

电阻率成象测井是石油测井中最新一代的测井方法。对测井仪器响应的精确模拟，可以为此类仪器的优化设计和资料解释提供依据。针对电阻率成象仪的激励条件比较复杂以及井下地层的非均质性，选用适于处理复杂条件问题的三维有限元方法对仪器产生的位场进行分析；基于电阻率成象仪器的测量原理，给出了利用有限元分析得到视电阻率的方法；通过对水平、倾斜等典型地层模型的数值模拟测量，得出相应的电阻率井壁成象结果，从而直观地反映井壁地层特征。

Analysis of Finite Element Method on Resistivity Imaging Logging

Resistivity imaging is the latest method of well logging.The precise simulations of imager are the basis of optimization design and well log interpretation.In view of the complex sources of resistivity imager and heterogeneity of the underground formation,the three-dimensional finite element method is applied to analyze the potential fields excited by the imager.In this paper, the measurement principle of resistivity imager and the approach of obtaining apparent resistivity by finite method are given,some typical formation models,such as horizontal and sloped beds are simulated, and the results are converted to resistivity imager to reflect the formation characteristics on the wall directly.