Issues of the journals Геофизика 2013 y. issue 1

Experimental estimation of accuracy in the task of reservoir engineering by the layered acoustic inversion in West Siberia

(Kondratiev I.K. Bondarenko M.T. Reygass E.V. Kissin Yu.M. )

Carrying out the comparison of seismic inversion results with the well log data the real accuracy of the forecast of reservoir parameters is estimated. In spite of complicated geological circumstances the layered acoustic inversion insures the high accuracy of acoustic parameter estimation (1-2%) whereas the accuracy of capacity parameter forecast is essentially less (21-23%).......

  • 2013  № 1, pp. 11-18

The construction of the Earth's crust macromodel applying the Reapak-technology along the 3-DV geotraverse (East Siberia)

(Roudnitskaya D.E. Staroseltsev V.S. Salnikov A.S. )

The 3-DV geotraverse extending for 1 400 km from the settlement of Skovorodino to Yakutsk is unique in its location and the complex of used geological and geophysical methods. The Earth's crust macromodel is constructed from MG-CDP data using the ReapakRK+ system, which is based on seismic inversion, clusterization of obtained pulse characteristics, and calculated Reapak-attributes. The analysis of these data has allowed formalizing some identification characteristics of the justified transition from seismic fields to structural and qualitative description of individual elements of the Earth's crust macromodel. The macromodel is represented by five macroblocks separated by deep faults. Two southern blocks, namely Amur and Stanovoi, belong to folded regions, the other three, namely Aldan, Yuzhno-Yakut and Yakut blocks, to the Siberian Platform. In all the macroblocks the Moho discontinuity is traced, macrolayers of the lower, middle and upper Earth's crust are distinguished. The macromodel's elements differ in rock compositions, degrees of their destructuring and outgassing, morphology, inner boundary extents and dips, and other characteristics of the section.......

  • 2013  № 1, pp. 19-26

Cross-borehole resistivity imaging for deep seated ore: a case study in Norilisk region

(Kulikov V.A. Bobachev A.A. Yakovlev A.G. Gruzdeva I.D. )

The deep seated ore is difficult task for geophysical investigation. Using cross-borehole resistivity imaging allows to work with this problem successful. We adapted and applied this approach to research ore body seated on the depth more then 1 km in. This article describes theoretical base, field setup and inversion results.......

  • 2013  № 1, pp. 27-34

The manifestation of and allowing for the inductively induced polarization in TEM sounding studies of sedimentary cover in the South of Siberian Platform

(Kompaniets S.V. Kozhevnikov N.O. Antonov E.Yu. )

In the South of Siberian Platform, the TEM sounding method has found wide use in studies of sedimentary basins, search and prospecting of oil and gas fields and ore deposits, and solving other geological problems. Usually, TEM data are interpreted in the context of conductive non-polarizable geological media. In most cases it is a reasonable practice, but TEM responses measured at different spacing between transmitter and receiver loops couldn't be reasonably interpreted without regard for the inductively induced electrical polarization. The inversion of the TEM data in terms of 1D earth with the resistivity described by the Cole-Cole formula has shown that induced polarization effects are associated with near-surface layers rather than with the deep ones. The polarization is due to pyrite, graphite and coal occurring in the near-surface rocks. In studies of sedimentary cover in the South of Siberian Platform with the TEM sounding method the joint measurement with central loop and loop-loop arrays enables one to recognize inductively induced polarization effects and to interpret them in terms of the Cole-Cole model.......

  • 2013  № 1, pp. 35-40