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Russian Geology and Geophysics

2009 year, number 1

A new method of controlled-source frequency induction soundings

R.B. Zhuravleva, D.G. Mironov
Institute of Geophysics, Ural Branch of the RAS, 100 ul. Amundsena, Yekaterinburg, 620016, Russia
Keywords: Subsurface structure; information parameter; frequency induction sounding; field frequency; separation; resistivity; resolution
Pages: 53-56


We suggest a new inversion method for frequency induction data implying the use of a new parameter, which has a simple analytical form in the case of a uniform subsurface. The new parameter is found from induction numbers measured in the field of a vertical magnetic dipole or a vertical magnetic dipole combined either with a horizontal electrical dipole or with a horizontal magnetic dipole. Compared with the classical methods, the new technique provides better resolved resistivity curves and faithful images of the subsurface at higher frequencies and smaller transmitter-receiver separations. The inversion algorithm is applied to amplitude and amplitude-phase data and provides reliable depth assignment of the detected resistivity layers in the latter case.