Mark Naumovich Berdichevskiĭ

Vladimir Ivanovich Dmitriev

An introduction to modern magnetotellurics, from pioneers Tikhonov and Cagniard to present, this volume provides a comprehensive summary of theoretical and methodological aspects, offering a connected and consistent account of the principles of magnetotellurics. Concluding chapters also demonstrate the potential of magnetotellurics in oil and gas surveys.

Magnetotellurics in the Context of the Theory of Ill-posed Problems

Mikhail Semenovich Zhdanov

Deep geomagnetic sounding - used by geophysicists to study the phase and the thermodynamic states of the earth's crust and upper mantle - has yielded many valuable results. This book presents some new approaches that can extend the potential of deep geomagnetic sounding. The authors present an analysis of the fundamental models of electromagnetic induction in the earth, thus paving the way to solving direct and inverse geoelectric problems. Numerous theoretical innovations are included, aimed at ensuring a more comprehensive interpretation of geoelectric data, many of them supported by practical examples. The book is primarily written for scientists and postgraduate students in geomagnetism and geoelectrics, but may also be useful to geophysicists dealing with mathematical theory of interpretation and, in certain sections, to specialists in electrodynamics.

Advanced Theory of Deep Geomagnetic Sounding

Andreas Rüger

Observing offset-dependent seismic reflectivity has proved to be a valuable exploration tool for the direct detection of hydrocarbons. This monograph provides a comprehensive review of reflection coefficients and their approximations in isotropic media, followed by an in-depth discussion of reflection amplitudes in anisotropic media. No prior knowledge of seismic anisotropy is assumed, and considerable effort is spent to introduce wave propagation and medium parameterizations useful for surface seismic applications in the presence of anisotropy. The first anisotropic model discussed here is transverse isotropy with a vertical axis of symmetry (VTI media), typically used to describe shale sequences. The study of the VTI reflection coefficients is then extended to transverse isotropy with a horizontal axis of symmetry (HTI)-the symmetry system that describes a system of parallel vertical cracks. Analysis of the "Shuey-type" approximate HTI P-wave reflection coefficient makes it possible to devise fracture-detection algorithms based on the inversion of azimuthal differences of the P-wave AVO gradient. The monograph also presents analysis of shear- and converted-wave reflection coefficients for HTI and orthorhombic models, discusses practical aspects of applying the azimuthal AVO analysis, and mentions some promising recent results.

Mark Naumovich Berdichevskiĭ

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