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Seismic Survey Technologies
Guidelines for Authors
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G.A. Shekhtman, I.P. Korotkov
MULTICOMPONENT SEISMIC: ADVANCEMENT STAGES AND TENDENCIES
The article considers advancement stages of Russian and foreign multicomponent seismic from the moment of its origination. It briefly outlines the advantages and limitations of the method. Models of the real media, wave types for multiwave seismology and problems of modern processing of the multicomponent seismic data are considered as well.
“Geophysical Data Systems” Ltd., Office E-302, Leninsky prosp., 113/1, Park Place, Moscow, 117198, Russia, e-mail:
I.O. Bayuk*, N.I. Dyaur**
CALCULATING SHALE STIFFNESS TENSOR BY EFFECTIVE-MEDIUM INVERSION OF LIMITED VELOCITY DATA
A method is suggested to estimate the stiffness tensor of gas shale in the case when the amount of available velocity data is insufficient for applying the conventional technique. The new method employs the effective medium theory to relate the measured physical properties of rocks with their composition and texture. In the course of modelling, rocks are characterised from data on their microstructure, the model is parameterised, and the unknown parameters are determined from available experimental data. The constrained parameters are further used for calculating the stiffness tensor. The modelling procedure has been tested in laboratory using data on compressional and shear wave velocities in shale samples selected from different formations. The method has been successfully applied to predict the stiffness tensor of shale from sonic logs.
*Institute of Physics of the Earth RAS, 123995, Moscow, B. Gruzinskaya str., 10, Russia, e-mail:
**University of Houston, TX 77004, Houston, Calhoun Rd., 4800, USA, e-mail:
E.I. Mashinskii, N.A. Golikov
ATTENUATION OF ULTRASONIC P- AND S-WAVES IN FULLY AND PARTIALLY SATURATED SANDSTONES UNDER PRESSURE
Attenuation of ultrasonic
-waves in fully and partially saturated sandstones has been studiedunder
a confining pressure of 24 MPa and dry-room temperature. The spectral ratios (Qs /Qp )( f ) in the bandwidth from 0.25 to 0.6 MHz were plotted for eight sandstone samples over the complete saturation range Sw = 0–100%. Most of the (Qs /Qp )( f ) curves behave monotonically (~f or 1/f ) but some have peaks or inverted U shapes. The Qp Qs −1 / −1 ratio in fully saturated sandstones is always lower than that in the dry or partially saturated sand stones (~ 1−3 against ~ 4−20, respectively), and decreases as the samples become wetter. Some partially wet sandstones ( Sw = 20–90%) develop local (Qp /Qs )(Sw ) −1 −1 peaks which obscure the saturation dependent behaviour and impede the diagnostics. In all sandstones, Poisson’s ratio (ν ) increases (up to 82 %) with increasing water saturation. The peaks on Qp –1(Sw), Qs –1(Sw) curves ratio match the local peaks of Poisson’s ratio in the ν (Sw ) curves. The attenuation peaks may result from patchy gas and water saturation in lithologically heterogeneous reservoirs. The frequency dependence of attenuation approximately fits the SIS model. The frequency- dependent attenuation ratio is an indicator of gas or water saturation in most of the studied sandstones, while Poisson’s ratio can provide an additional check. The reported results can be used to improve geological interpretation of sonic logs and seismic data.
Trofimuk Institute if Petroleum Geology and Geophysics SB RAS, Aсad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
V.A. Levin, A.V. Vershinin, I.A. Mishin, A.M. Sboychakov, K.A. Petrovskiy
ELASTIC WAVE PROPAGATION IN NON-LINEAR MEDIA WITH INITIAL STRESSES. COMPUTER MODELING IN CAE FIDESYS
The article considers formulation and solution of a elastic wave propagation problem in the non-linear media with initial strains, being finite in general case. It takes into account that elastic waves propagation involves large additional strains, imposed physically on the ones, existing already. The theory of superimposed large strains is used for the problem setting.
Lomonosov Moscow State University, 119991, Moscow, Lininskie gori, Russia,
CONTINUOUS SEISMIC STRATIGRAPHIC MODELLING AS A BASIS FOR STRUCTURAL INTERPRETATION OF CMP DATA
A new method for continuous seismic stratigraphic modelling implies matching fragments of seismic traces in CMP gathers over the whole time interval of the section. With the new method, the user can trace any number of discrete reflectors, estimate qualitatively the spatial distribution of geological features and rock physics, and obtain continuous paleostructural models. The algorithm is realised using techniques originally designed for automatic correlation of crosswell data while wells are simulated by seismic traces with specified amplitude responses.
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia, e-mail:
Yu. N. Dolgikh
PROBLEMS OF SRM-CDP DATA TRAVELTIME INVERSION IN NORTHERN REGIONS OF WESTERN SIBERIA
The purpose of traveltime inversion of CRM-CDP data is developing and defining of a velocity-depth thick-layer model of a section on the basis of joint use of traveltime attributes of reflection horizons, well data and other prior information.
This process is not strictly formalized due to features of the method, landscape and surface environment peculiarities, differences in the level of metrological provision, as well as the quality of field data and also because of general ill-posedness of the seismic inverse traveltime problem.
Results of traveltime inversion depends on a set of assumptions about the model features describing target horizons, adequateness of using priory information, data acquisition technique, methodology of traveltime processing and interpretation.
This paper summarizes the most significant factors, affecting the accuracy and reliability of traveltime inversion, provides recommendations for analysis and elimination (minimization) of influence of the factors mentioned (when applied to real data and processed with traditional processing tools) and demonstrates some case studies.
Closed Joint-Stock Company “Scientific-production centre “SibGeo”, Nemtsova str., 22, Tyumen, 625002, Russia, e-mail:
S.N. Ilyin., I.A. Votsalevskaya, M.U. Romanenko
VELOCITY MODELLING IN A STRATIGRAPHIC GRID
A summary of years-long experience in seismic data interpretation is provided along with description of a new approach to velocity modelling. The stratigraphic-grid velocity models generated with this approach are applicable to a broad scope of objectives, from time-depth conversion to seismic inversion and migration. The suggested way of velocity modelling is illustrated with an example.
CGG Vostok (A CGGVeritas company), 115162, Moscow, Shabolovka 31B, entrance 3, floor 3, ussia, e-mail:
G.V. Golikova*, K.Yu. Sannikov*, L.A. Daragan-Sushova**, E.L. Lyskova*, M.A. Vasil’ev* **
FORECASTING OF WAVEFIELD FREQUENCY CHARACTERISTICS IN SEDIMENTARY SECTION
The article presents results of a seismogeological research of a section of sedimentary deposits of the Jurassic and Triassic Age in the South Barents Hollow in the vicinity of Severo- Kil’dinskaya borehole-82. The study included development of a seismic model and numerical modeling of the wave field. It has been also important to establish an interrelation between the lithology of the studied section and the frequency characteristics of the wave field. It involved detection of the lithologic packs corresponding to the simulated waves and forecasting of possible frequencies of the interferential waves, formed in the packs. The frequencies of the experimental wave field have been determined from a wavelet-analysis. The main result of the research has been a good agreement of the frequency ranges, obtained from the experimental and theoretical data, as well as close frequency characteristics for the regional waves.
*St. Petersburg State University, Ul’yanovskaya str., 1, Petergof, St.-Petersburg, 198504, Russia, e-mail:
** FGUP “VSEGEI”, Sredny prosp., 74, St. Petersburg, 199106, Russia, e-mail:
S.V. Gorbachev, M.V. Gubarev, A.V. Derduga, A.B. Titov
SEISMIC-GEOLOGICAL MODELLING FOR DESIGN OF 3D SURVEY IN COMPLEX GEOLOGICAL AND PHYSIOGRAPHIC CONDITIONS
The use of preliminary seismic-geological modelling is suggested as a system approach to design of 3D seismic in complex geological conditions and is illustrated with a case from southern Russia. The local geology and wave-field features were characterised using field and synthetic 2D and 3D seismograms, which made basis for choosing the system configuration and outlining the area of 3D survey. The approach is shown to be an effective tool for optimising survey design as it can ensure the best choice of acquisition parameters.
LARGEO NefteGazService LLC, Sokolnicheskiy Val, 2A/2, Moscow, 107113, Russia, e-mail:
Yu.G. Antipin, M.T. Yakupov
VIBROCORRELATION AND VIBRODECONVOLUTION FOR SEISMIC DATA PROCESSING
The article considers a vibrocorrelation procedure used in processing of seismic data with vibration source and its shortcomings. The authors set grounds for applying of a vibrodeconvolution procedure, as an alternative method, having no such drawbacks, instead. Benchmarking of the results for a theoretical sweep-signal for the both procedures has been performed.
Ltd. SPC “GEOSTRA”, 450071, Ufa, str. Luganskaya, 3, Russia, e-mail:
To the 75th birthday of G.A. Shekhtman