井中磁测三分量联合反演

A joint inversion method for borehole magnetic three-component data

本文实现了井中磁测三分量联合反演,根据最小二乘原理建立了井中磁测三分量联合反演的目标函数,利用加阻尼因子的广义线性反演方法求解长方体模型几何参数与物性参数。通过5个理论模型反演结果的对比,得出三分量联合反演无论是对于井旁异常还是井底异常,无论是信息充分还是信息不充分,其反演结果都比单分量好。究其原因,是因为地磁场本身是一个矢量场,三分量联合反演充分利用了矢量场信息,提高了目标函数对未知参数的敏感度。将该方法用于新疆A矿区井中磁测资料的反演解释,较好得出井旁矿体的空间位置及下延情况。

In this paper,we present a joint inversion method for borehole magnetic three-component data.Objective function of the joint inversion for borehole magnetic three-component data is established based on least square principle,and generalized linear inversion with damped factor is used to calculate figure and size of vertical cubes.5 theoretical models are calculated.Whether the cube is besides the borehole or beneath the borehole and whether the information is enough or not,the joint inversion obtains better results than single component inversion.The internal reason may be that geomagnetic field is a vector field,and the joint inversion of three-component data can make full use of the vector field information.So the sensitivity for unknown factors is improved.The method isused for borehole three-component magnetic data in Xinjiang,and the cube position besides boreholes and its downward extension are obtained.