大地电磁全张量响应的一维各向异性反演

目前大地电磁(MT)测深资料反演主要基于各向同性介质,但随着MT实际应用的需要,各向异性研究已逐渐引起关注.我们采用广泛应用的广义逆法对一维MT水平层状各向异性介质模型反演进行了探索性研究,并实现了MT全张量响应(即所有的阻抗张量的视电阻率和相位)的一维各向异性反演.理论模型试验表明,无论理论观测值中是否含有噪声,这种方法都能够较好地恢复真实模型,验证了其正确性和有效性.将此方法用于MT实测资料时,能够同时拟合4对视电阻率和阻抗相位曲线,说明本方法可以用于实测资料的处理解释,具有一定的实用价值.

A magnetotelluric inversion method of the whole tensor impedance response to one-dimensional anisotropic structure

At present the inversion of magnetotelluric(MT) data is mostly based on the isotropic media,however,to meet the practical need of MT sounding,attention has been gradually paid to the anisotropic investigation.Adopting the widely used generalized inverse matrix method,which is simple and reliable,we conduct an exploratory research on the horizontally layered anisotropic model,and realize the inversion of the MT whole tensor response(that is,all the apparent resistivity and phase of the impedance tensor) to the one-dimensional anisotropic structure.The method has been tested extensively with synthetic data(noiseless data and noisy data) and proven to be successful and valid.When applied to the MT field data,the four pairs of the apparent resistivity and impedance phase curves could be fitted simultaneously.Therefore the method could be used to invert field data and its application has been proven valuable.