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RUSSIAN ACADEMY OF SCIENCES, SIBERIAN BRANCH INSTITUTE OF GEOPHYSICS SCIENTIFIC-INDUSTRIAL ENTERPRISE OF GEOPHYSICAL EQUIPMENT «LOOCH»

VIKIZ METHOD FOR LOGGING OIL AND GAS BOREHOLES

Novosbirsk 2002

Translation of: Tekhnologiya issledovaniya neftegazovykh skvazhin na osnove VIKIZ, Novosibisk: Scientific Publishing Center of the United Institute of Geology, Geophysics and Mineralogy, SBRAS; Publishing Hourse of the SB RAS, 2000. VIKIZ Method for logging Oil and Gas Boreholes / Novosibirsk: Branch “Geo” of the Publishing House of the SB RAS, 2002, 112 ð. ISBN 5-7692-0510-5
The book represents the fundamentals of High Frequency Induction Logging Isoparametric Soundings in oil and gas boreholes. This method is known in Russia as the VIKIZ method. There have been considered a widerange of methodical problems for applying the VIKIZ method along with an interpretation of logs obtained for terrigenous sections. The experience for more than ten years of practical application of this technique in different regions has been analyzed and generalized. The multifunctional computer system of log inversion has been described and the ways for using this system have been recommended.The book is intended for geophysicists and geologists specialized in the field of production geophysics. The book will be also useful for students, post-graduate students, and researchers interested in geophysical investigations in boreholes.

Compiled by: M.I. Epov, Yu.N. Antonov, I.N. Yeltsov, S.S. Zhmaev, A.N. Petrov, V.N. Ulyanov, V.N. Glinskikh, V.N. Eremin, K.N. Kayurov, V.V. Kiselev, V.T.Lavrukhov, S.V. Martakov, M.N. Nikitenko, M.Yu. Revva, A.Yu. Sobolev, K.V. Sukhorukova, and A.B. Cheryauka Translated by: T.A. Korneva English version edited by: Yu.A. Dashevsky

ISBN 5-7692-0510-5

Ó Institute of Geophysics SB RAS, 2002 Ó SIEGE “Looch”, 2002

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K E Y G E O LO G I C A L A N D G E O P H YS I C A L P R O B L E M S S O LV E D B Y T H E V I K I Z M E T H O D

Themethod of High-Frequency Induction Logging Isoparametric Sounding has been developed for evaluation of spatial distribution of the resistivity in rocks penetrated by oil and gas boreholes. This method is widely used in geophysical investigations and it is known in Russia as the VIKIZ method. In this connection, hereafter we shall use the term “VIKIZ method” to mean High-Frequency Induction LoggingIsoparametric Sounding one. Using the VIKIZ method allows solution of the following problems on geophysical investigation in boreholes: · subdivision of a section with evaluation of a thinly bedded profile with the high spatial resolution; · location of oil-water and gas-water contacts; · determination of the resistivity of undisturbed formation as well as that of an invaded zone with estimatingradial depths of displacement of formation fluids; · setting and estimation of the radial heterogeneity parameters in zones of invasion including evaluation of salt formation water accumulations (“bordering zones”) as a direct qualitative indicator of the presence of moveable hydrocarbons in reservoir rocks. The VIKIZ method based on measurement of the relative phase characteristics can be used forinvestigation in boreholes filled with highly conductive drilling mud (resistivity is less than 0.5 ohm × m) as opposed to three-coil probes of Induction Logging by which the absolute values of signals are measured on the background of the compensated source field. The results of quantitative VIKIZ log interpretation after integrating with data on other geophysical methods and petrophysicalinformation allow evaluation of the hydrocarbon saturation and lithology of a terrigenous section. Estimation of a heterogeneity of reservoir properties within intervals of porous permeable formations and distinguishing tight sandstone with carbonaceous or silica cement, etc. can be obtained from the interpretation results as well.

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