GEOMECHANICS AND FLUID FLOW EFFECTS ON ELECTRIC WELL LOGS: MULTIPHYSICS MODELING
I.N. Yeltsov1,2, L.A. Nazarova3,2, L.A. Nazarov3,2, G.V. Nesterova1, A.Yu. Sobolev1,2, M.I. Epov1,2
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3N.A. Chinkal Institute of Mining, Siberian Branch of the Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091, Russia
Keywords: Oil well, invasion, stress, strain, multiphysics, high-frequency induction isoparametric wireline logging (VIKIZ), Russian lateral logging (RLL)
Subsection: GEOPHYSICS
Abstract
Coupled geomechanic and fluid flow analysis is applied to develop theoretical and experimental background for geosteering and well logging to diagnose a state of near-wellbore formation and oil reservoir. The suggested methods of processing EM induction (VIKIZ) and Russian laterolog (RLL) resistivity responses account for effects of stress-dependent fluid flow changes. The geomechanic and fluid-flow effects on resistivity well logs are investigated for the case of asymmetric invasion and related irreversible deformation. Ways of taking into account stress-dependent effects on resistivity logs are developed on the basis of 3D modeling of geomechanic and electromagnetic fields.
DOI: http://dx.doi.org/10.1016/j.rgg.2014.05.020
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