ATTRIBUTE MIGRATION FOR THE CREATION OF AZIMUTH ANGLE DOMAIN IMAGING

(Shalashnikov A.V. Finikov D.B. )

The paper describes a method for obtaining widely demanded azimuth and angle domain imaging of seismograms of the common image point, obtaining stable estimates of the kinematic parameters of wave fields. The method includes multi-dimensional correlation of the wave fields resulting from migration using weighted migration operators, to retrieve geometrical characteristics fronts of the reflected waves. We describe a modeling technique to verify the results of the algorithms. The research is carried out by Seismotech, Ltd under the grant support of Skolkovo Foundation.......

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  • 2019  № 2, pp. 16-22

GEOSTATISTICAL ALGORITHM FOR WELL LOG DATA FILTERING IN THE STRUCTURAL MAPPING

(Permyakova I.S. Tyukavkina O.V. )

For estimate resource base of the studied reservoir, the paper presents a method of optimal declustering of well data for fields with a relatively high degree of drilling. Using of the whole set of available information collected on the irregular grid, in some cases, gives a displaced estimate for the structural constructions controlled by seismic data. Geostatistical modeling of deposits using a declustered list of wells allows you can obtain the model of the interest object does not distort the seismic information using the geometrization natural reservoir of oil on the basis of the analysis of the data. The authors suggest using seismic data to control wells data, and using wells data, to reduce inaccuracies of seismic information.......

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  • 2019  № 2, pp. 23-29

APPLICATION OF PRO (PARAMETRIC EXPANSION OF REFLECTIONS) MIGRATION TECHNOLOGY IN 2D SEISMIC PROCESSING FOR IMAGING IN COMPLEX TECTONIC CONDITIONS

(Kondrashkov V.V. Mramorova I.M. )

This work shows experience of using PRO migration (Parametric expansion of reflections). Based on the PRO approach, migration implements a depth transformation using the average velocity model of the environment. The results obtained for real data i.e. seismic time sections, sections of seismic energy, migration velocities and PRO interval velocities allow to distinguish some classes of models of environments for which this tool works most effectively: environments with complex tectonics, with high changes of velocities.......

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  • 2019  № 2, pp. 30-36

THE RESEARCH OF THE ANISOTROPY OF THE ENVIRONMENT IN THE BOREHOLE SEISMIC WITH LONGITUDINAL WAVES SOURCES

(Lensky V.A. Irkabaev D.R. Zhuzhel A.S. )

One of the main tasks of recent seismic observations in wells is to study the anisotropy of the environment. According to the materials of well observations with a traditional seismic source of longitudinal waves, only the anisotropy of longitudinal waves can actu- ally be studied, for the correct assessment of the anisotropy of transverse waves, a source of directional excitation of transverse waves is necessary. Multibeam offset VSP provides an assessment of the anisotropy of HTI and VTI environments throughout the depth range. VSP-2D allows to estimate anisotropy of VTI medium, and at observations not less than on three profiles and anisotropy of HTI medium, but only at the depth of reception. VSP-3D, in contrast to two-dimensional observations, provides ample opportunities for azimuthal sampling of excitation points and determination of anisotropy of HTI and VTI media, a large density of observations provides a higher ac- curacy of the results. As in VSP-2D, in observations with a borehole probe of limited length, the obtained result of anisotropy assessment of VTI medium refers to the depth of reception, and azimuthal anisotropy - to the overlying thickness of sediments, the specific depth of the azimuthally anisotropic layer remains unknown. The spatial arrangement of the rays in VSP-3D presents the possibility of determining the real anisotropy of the medium with the real position of the axes of symmetry, not limited to the cases of HTI and VTI media.......

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  • 2019  № 2, pp. 37-44

ANISOTROPY PARADOX AND INDUCED ELECTRIC CHARGES

(Karinskiy A.D. )

For a model of a homogeneous anisotropic medium, expressions for the density of volume electric charges induced in such medium and the field created by them are obtained. The simulation results are considered for the cases when the point electrode A as well as the dipoles AB having a different orientation relative to the anisotropy axis are sources of a primary stationary electric field. It is shown that the cause of the phenomenon, which was called «the anisotropy paradox», is the effect on the electric field of the volume electric charges induced in an anisotropic medium.......

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  • 2019  № 2, pp. 45-51
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