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CONTENT
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V.Yu. Burmin
pages 5-16
Inversion of travel times for seismic waves propagating in vertically inhomogeneous media
The article provides an overview of the inverse kinematic problem of seismology for the elastic half-space, and methods for their solution discussed by the author. The first problem is inversion of discontinuous travel-time curves of refracted waves. For this a system of two Fredholm integral equations of the first kind is obtained whose solution reduces to a quadratic programming in the class of piecewise monotone functions. The second problem concerns to inversion of travel-times from deep source. The third problem (which similar to the second one) is the inversion of the reflected wave travel times from a plane boundary. The fourth problem is the inversion of reflection travel- times from common depth point (CDP) for a medium with curved boundary. It needs to reveal the velocity distribution over the boundary, depth and the boundary inclination. The fifth problem relates to the inversion difference in travel-time curves of the longitudinal and converted shear waves. Solution of the problem is found in the class of monotone functions and the result is the boundary depth and distribution of velocities of
P
-and
S
-waves. The sixth task – smoothing the observed travel-time curves of seismic waves by convex cubic splines.
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, D-242, Bol. Gruzinskaya str., 10, Moscow, 123995 GSP-5, Russia, е-mail:
burmin@ifz.ru
A.L. Karchevsky
pages 17-22
Horizontally stratified medium: differentiation with respect to the discontinuity point coordinate
In this paper we prove the existence of derivative of residual functional with respect to a coordinate of medium properties discontinuity. We also derive expressions for this derivative.
Sobolev Institute of Mathematics SB RAS, Acad. Koptyuga prosp., 4, Novosibirsk, 630090, Russia, e-mail:
karchevs@math.nsc.ru
L.D. Gik
pages 23-28
Measuring attenuation of seismic waves for solving problems of petroleum seismic exploration
The method of measurement of attenuation parameters of seismic waves as a rational way to search for hydrocarbon-bearing deposits is developed. It is proved the utility of attenuation parameters determination from the ratio between the increment of the period of the probing signal and the travel times from the source.
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
GickLD@ipgg.nsc.ru
G.A. Dugarov* , I.R. Obolentseva* , T.I. Chichinina**
pages 29-41
Analysis of seismic waves velocity and attenuation anisotropy in a medium with one system of parallel fractures
A forward problem on seismic wave propagation in an effective model of an isotropic medium with oriented fractures and attenuation is solved. In this model the symmetry axis is perpendicular to fracture planes. Phase velocities and attenuation of the three wave types (qP, qSV, SH) are computed from eigenvalues of Christoffel tensor with the complex-valued tensor of elasticity-attenuation moduli. This tensor includes the velocities V P, iso , V S, iso in the isotropic medium and the four constants characterize fractures…
*Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
geserdugarov@gmail.com
,
irobolentseva@ngs.ru
**Instituto Mexicano del Petroleo, Eje Central Lazaro, Cardenas 152, 07730, Mexico D.F., Mexico, e-mail:
tichqvoa@yahoo.com
T.V. Nefedkina* , V.V. Karsten* , A.A. Egorova**
pages 42-48
Spatial amplitude analysis of compressional wave reflections in azimuthally anisotropic media
Algorithm for spatial AVOA analysis of
P
-wave reflections used for the study of anisotropic media is developed. In contrast to the traditional sector-based AVOA analysis, the inverse problem is being solved using the complete set of data extracted from
P
-waves of 3D data and related to the common reflecting area. Testing of the method was accomplished using the simulated data for YTZ (Yurubchen-Tohomo Zone – a big oil-gas field in Russia). Results show a sufficiently high accuracy in determining the horizontal symmetry axis azimuth for both regular and irregular acquisition grids with signal to noise ratio > 4–5.
*Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
NefedkinaTV@ipgg.nsc.ru
,
KarstenVV@ipgg.nsc.ru
**Novosibirsk State University, Geophysics department, Pirogova str., 2, Novosibirsk, 630090, Russia, e-mail:
AngelinaEgorova87@gmail.com
G.A. Dugarov*, I.R. Obolentseva*, T.I. Chichinina**
pages 49-59
Estimation of fractured medium parameters from data on velocity-attenuation anisotropy of seismic waves
An inverse problem of wave propagation in an attenuative transversely isotropic medium is solved. The medium is represented as an effective model of an isotropic medium with a system of parallel fractures. It is characterized by the matrix of elasticity-attenuation moduli with elements depending on six parameters: the two are Lamé constants of an isotropic background, and the four constants describe fractures, which are real and imaginary parts of complex-valued weaknesses, normal and tangential ones. The inverse problem is posed as a problem to find the four fracture parameters from the anisotropy of
qP
-,
qSV
-, and
SH
-waves velocities and attenuations observed in the preset interval of propagation directions. A solution is in minimization by the least square method of residuals between the observed and theoretical values of velocities and attenuations. The analysis of the solution of the for ward problem and investigation of the properties of the minimized target function lead to the following conclusions. Data on the quasi-compressional wave
qP
permit to determine reasonably well only the normal weaknesses. The tangential weaknesses are best determined from shear-wave
SH
data, whereas the quasi-shear waves
qSV
are useful only in the absence of loops at the surfaces of ray velocities. The best results are attained by the joint use of
qP
- and
SH
-waves in the vicinity of the symmetry axis of the medium.
*Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
geserdugarov@gmail.com
,
irobolentseva@ngs.ru
**Instituto Mexicano del Petroleo, Eje Central Lazaro, Cardenas 152, 07730, Mexico D.F., Mexico, e-mail:
tichqvoa@yahoo.com
S.B. Gorshkalev*, V.V. Karsten*, E.V. Afonina*, P.S. Bekeshko*, I.V. Korsunov**
pages 60-70
Results of studying the azimuthal anisotropy of the subsurface at Pelyatkinsky area from multiwave VSP and seismic 3D data
Processing of VSP data for well 830 at Pelyatkinsky area (North of Western Siberia) has been completed and polarization analysis of shear and converted waves, both reflected and downgoing, has been carried out. Azimuthal anisotropy of the subsurface is detected in a large depth range, and its parameters are defined. Stability of symmetry elements of the medium at different depths is uncovered. The anisotropy revealed allows predicting the direction of maximum permeability in the reservoir which is an important factor in planning the development. Using azimuthal velocity analysis of 3D seismic data, lateral distribution of anisotropy pa- rameters over the area is obtained consistent with the VSP processing results.
*Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Aсad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
GorshkalevSB@ipgg.nsc.ru
**Geostylus Ltd., Karl Marx str., 62, Krasnoyarsk, 660049, Russia, e-mail:
Geostylus@rambler.ru
K.A. Dunaeva, O.M. Sagaydachnaya, A.S. Salnikov
pages 71-83
Application of seismic fields wavelet transform with reconstruction into time domain
Discrete wavelet decomposition on detailed layers includes division of wavelet coefficients vector into sum of vectors of coefficients of different detailing level and reconstruction of detailed layers into time domain. The technique of seismic data processing with use of wavelet filtration based on discrete wavelet decomposition of signal on detailed layers allows to expand the program package of dynamic processing, analysis and interpretation of seismic fields. Efficiency of wavelet filtration is demonstrated on real seismic data obtained during realization of three-component wave soundings (Krasnoyarsk Territory); deep seismic survey (DSS) that were obtained by “land–sea” observation system (Chukchi Region); detailed acoustic measurements in coal mined (Kuznetsk Basin). It is important that wavelet filtration based on wavelet decomposition detailed layers gives possibility to keep local features of signal component.
Siberian Research Institute of Geology, Geophysics, and Mineral Resources, Krasnyi prosp., 67, Novosibirsk, 630091, Russia, e-mail:
som@sniiggims.ru
V.V. Kovalevsky*, G.F. Sedukhina*, M.S. Khairetdinov*, A.A. Yakimenko*, N.I. Geza**, V.I. Yushin**
pages 84-92
Experimental estimation of absolute levels of coherent seismic oscillations by means of vibrational technologies
We develope technology for detecting and to measuring vibro-seismic oscillations on the nanometer level against the multiply exceeding noise is described. This technology is based on methods of correlated and in-phase accumulation of vibro-seismic oscillations, radiated by precisely controlled vibrators. The results obtained are applicable for solving the vibro-DSS problems and active vibro-seismic monitoring.
*Institute of Computational Mathematics and Mathematical Geophysics SB RAS, Acad. Lavrentjeva prosp., 6, Novosibirsk, 630090, Russia, e-mail:
kovalevsky@sscc.ru
,
galya@opg.sscc.ru
,
marat@opg.sscc.ru
,
al-le@yandex.ru
**Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
lava.ru@inbox.ru
YushinVI@ipgg.nsc.ru
G. Mitrofanov, V. Priimenko
pages 93-108
Basics and applications of the Prony filtration method
In this paper some important questions of the Prony filtration method and its applications are presented. The method can be used in seismic data processing and interpretation for various geological and production tasks. It stands as a tool for estimating target horizons or productive zones. The tool allows to localize zones of anomalous scattering and absorption (depending on the temporal frequency) of seismic energy, which are related to the target horizons. Analysis and interpretation of these zones provides better understanding of features and gives possibility to correlate these features with perspective reservoirs. In the paper special attention is paid to three points: 1) the theoretical foundations of the Prony decomposition, obtaining stable estimates of the Prony spectra for signals similar to seismic ones; 2) using Prony spectra in the signal filtration processing, i.e., construction of the Prony filtration algorithms; and 3) the description of Prony filtration technology and examples demonstrating its capabilities in practice. Using simple examples, we try to introduce the basic ideas of the technology, illustrating the main points that are important for the application of this method in the real seismic data processing.
LENEP/CCT, UENF, Rod. Amaral Peixoto, km 163 – Av. Brennand s/n, Umboacica, CEP: 27.925-310 Macae, RJ, e-mail:
georgymitrofanov@rambler.ru
V.V. Miroshnikov, A.P. Sysoev
pages 109-113
Joint processing of experimental seismograms for choosing parameters of the source
Autocorrelation and cross-correlation functions of seismograms obtained from the same source point and along receiver spread make it possible to build nonlinear equation system solvable for signal and noise. The solution of this system can produce more reliable estimates of signals amplitude spectrum of compare with independent source parameters estimation.
Sibneftegeofizika, Lomonosova str., 57, Novosibirsk, 630005, Russia, e-mail:
sysoev@sibngf.ru
B.P. Sibiryakov
pages 114-117
The nature of blocked media instabilities and some catastrophic scenarios
In the logarithmic scale the relation between specific surface and the number of instable solutions of equations of motion is close to experimental relation between the energy and the number of earthquakes. This law is not specific for seismology only. The metastable phenomena, which introduce catastrophic processes, are special states between statics and dynamics.
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
SibiryakovBP@ipgg.nsc.ru