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开发了一种快速高效的井间电磁场一维反演方法 .通过矩阵求逆计算纵向成层地层中的Green函数并同时得到雅可比矩阵的元素 ,加快了计算速度 .反演时采用正则化最小二乘法求解超定方程 ,由于发射 -接收的组合数目大大超过待反演的地层参数的数目 ,因而反演结果精度高 .数值计算举例表明 ,无论是低电导率对比地层还是高电导率对比地层 ,反演结果均与模型完全吻合 .井间电磁场一维反演可以对实测数据进行预处理 ,为高维成像奠定基础
A fast and efficient one-dimensional inversion method of crosswell electromagnetic field was developed. The green function in longitudinal stratigraphic stratigraphy was calculated by matrix inversion and the elements of Jacobian matrix were obtained at the same time, which accelerated the computation speed. The least regularization The result of the inversion is highly accurate because the number of launch-reception far exceeds the number of formation parameters to be inverted, and numerical examples show that both the low conductivity contrast strata and the high conductivity contrast strata , The inversion results are completely consistent with the model.With one-dimensional inversion of crosswell electromagnetic field, the measured data can be pre-processed, which lays the foundation for high-dimensional imaging