方位电阻率成像仪(ARI)的三维有限元模拟

SIMULATION OF AZIMUTHAL RESISTIVITY IMAGER BY THE 3D FINITE-ELEMENT METHOD(FEM)

为了研究方位电阻率成像仪的定量解释方法 ,开发了一套能模拟方位电阻率成像仪在三维非均匀地层模拟中响应的三维有限元程序 .在简化的地层模型中 ,将该程序与解析方法和二维有限差分方法进行了对比 ,结果表明此程序的误差不超过 3% .在此程序得到验证后 ,用该程序考查了方位电阻率成像仪在一些典型三维非均匀地层模型中的响应 ,结果表明此程序能为方位电阻率成像仪的定量解释提供支持 .

For the interpretation of Azimuthal Resistivity Imager(ARI) in quantity,a modeling code using finite element method (FEM) is developed to simulate ARI responses in three dimensional inhomogeneous formation models.The code has been benchmarked against analytical solutions and 2D finite difference method(FDM) for subsets of the 3D geometry.The differences between the present results and two others are within 5%.The code has been also used to research some typical formation models in 3D environments.The results show it can provide support for the interpretation of ARI in quantity. [