Abstract
An analytical solution of pore pressure equations assuming the source of its perturbation in the form of lunar-solar tidal deformations, is generalized to the case of a model with an arbitrary number of layers. The calculation of the electric field of the electrokinetic nature is made. An assessment is made of the sensitivity of pore pressure and its vertical derivative to the elastic properties and permeability of rock strata. An inverse problem soultion program code is developed, capable of recovering the Biot modulus and Biot coefficient, as well as the permeability coefficient in a horizontally layered model. The possibilities of mapping these parameters are discussed, involving the borehole measurements of the vertical electric field of electrokinetic origin.
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ACKNOWLEDGMENTS
This paper is a development of research initiated by I.A. Garagash and N.I. Kolosnitsyn, to whom the authors express their sincere appreciation for the essential advice and support.
Funding
This work was supported by the Russian Foundation for Basic Research (Project 17-05-00511_а) and the State Research Order of IPE RAS.
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Alekseev, D.A., Gokhberg, M.B. Tidal Generated Electric Field in the Multi-Layer Structure and the Possibilities of Its Employment for Deriving the Elastic Properties and Permeability of the Subsurface Formations. Izv., Phys. Solid Earth 55, 337–347 (2019). https://doi.org/10.1134/S1069351319020010
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DOI: https://doi.org/10.1134/S1069351319020010