FORWARD MODELING AND INVERSION OF INDUCTION LOGS FROM SHALY SAND RESERVOIRS USING PETROPHYSICAL CONDUCTIVITY MODELS
V.N. Glinskikh1,2, G.V. Nesterova1, 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
Keywords: Forward modeling, inversion, conductivity, shaliness, porosity, water saturation, conductivity model
Subsection: GEOPHYSICS
Abstract
Algorithms and software have been designed for petrophysical 2D forward simulation and inversion of induction logs from oil wells drilled in shaly sandstone using conductivity models for different clay types. As comparative analysis of relative amplitudes and phases of tool responses has demonstrated, it is possible to estimate reliably and accurately fluid saturation and porosity from induction logs. The applied 2D numerical inversion of both theoretical and well logs yielded quantitative estimates of petrophysical parameters of reservoirs, with clay volume fraction assumed according to the chosen conductivity model. Correction for the presence of clay improves inversion quality if clay content as well as type are taken into account.
DOI: http://dx.doi.org/10.1016/j.rgg.2014.05.022
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