三维非对称介质电阻率各向异性反演及应用

针对海上水平井和大斜度井电阻率测井因受泥浆侵入、地层各向异性等因素影响,视电阻率会偏离真实地层电阻率的现象,提出了三维电阻率反演方法,旨在获取准确的地层电阻率剖面和井眼地层位置关系。利用哈里伯顿公司ADR方位电阻率测井数据,在正演仿真基础上采用基于Marquardt方法的迭代反演方法计算测井时刻的泥浆侵入半径和侵入带电阻率(有侵入地层)以及原状地层水平电阻率、垂直电阻率、层边界距离(水平井)等参数。数值模拟结果显示,反演方法精度较高,反演结果准确可靠。

Inversion of Anisotropic Resistivity in Three-dimensional Asymmetric Media and Its Application

For horizontal wells and high angle wells offshore ,LWD resistivity log is affected by mud invasion , resistivity anisotropy and other factors , leading to the apparent resistivity departing from the true formation resistivity ,a 3D resistivity inversion method is proposed and designed to get the accurate formation resistivity profile and borehole stratigraphic position , w hich provides reliable parameters for the reservoir evaluation and supplies effective protection for oil field development and production .For Halliburton ADR azimuthal resistivity logging data , the Marquardt method is employed to compute invasion radius , the flushed zone resistivity (invaded formation) ,and the virgin horizontal resistivity ,vertical resistivity ,boundary layer distance (horizontal well) etc .The results of numerical simulation show that the accuracy of the inversion method is high ;the inversion results are accurate and reliable . T he 3D resistivity inversion is very important for the reservoir stratum evaluation and the calculation of reserves .