FORWARD MODELING AND INVERSION OF LWD INDUCTION DATA
M.I. Epov1,2, V.N. Glinskikh1,2, K.V. Sukhorukova1,2, M.N. Nikitenko3, V.N. Eremin3
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, ul. Pirogova 2, Novosibirsk, 630090, Russia
2Novosibirsk State University
3A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Электромагнитные каротажные зондирования, каротаж в процессе бурения, геонавигация, геоэлектрическая модель, удельное электрическое сопротивление, Electromagnetic logging, logging while drilling, geosteering, resistivity, resistivity model
Subsection: GEOPHYSICS
Abstract
The processing algorithms for high-frequency induction resistivity data are applied to logs acquired at different stages of well construction. Open-hole induction logging while reaming of vertical wells provides a priori information on geology and resistivity distribution. The resulting resistivity model can make reference in geosteering for deviated and horizontal drilling. Algorithms for inversion of high-frequency induction responses from layered media are used in a software package for processing LWD data. The software provides real-time inversion to recover resistivities and depths to layers in oil and gas reservoirs penetrated by wells of a complex trajectory. It also allows checking the inversion quality by analyzing the sensitivity of tool responses to model parameters with reference to the tool specifications.
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