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Seismic Survey Technologies
Guidelines for Authors
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M.S. Denisov, O.A. Silaenkov
Capability enhancement of seismic data processing using wavefield extrapolation procedure
Forward and inverse wavefield extrapolations broaden the possibilities of seismic data processing schemes. Multiple prediction, correction for near-surface heterogeneities, velocitydepth model construction, seismic migration, etc. in complex seismogeologic conditions require application of the wavefield continuation methods. A theoretical background of wavefield extrapolation along with numerous examples on synthetic and real data that prove the efficiency of the approach proposed are provided.
J. Guilbaut, E. Landa, G.V. Reshetova, V.G. Khaidukov, V.A. Tcheverda
Numerical simulation of seismic wave fields in two dimension inhomogeneous elastic non-uniformly scaled mediums (karstic inclusions)
New numerical method for large-scale computer simulation of seismic waves in non-uniformly scaled heterogeneous media is developed. As non-uniformly scaled hereafter we mean media with heterogeneities of extremely different scales. In the paper some specific non-uniformly scaled medium is dealt with – karst intrusions within thin layered package. Karsts are produced as a result of interaction of water (surface or ground) with underlying bedrock, often limestone or marble. This causes very complicated, extremely irregular structure of karst intrusions - as a rule they form conjunction of local heterogeneities of different scales and very complicated shape. In order to be able to perform reliable finite-difference simulation of seismic wave’s propagation through these structures we develop approach based on the use of finite-difference techniques based on grids with local spatial refinement done within karstic areas.
*TOTAL E&P, АNGOLA
***Institute of Computational Mathematics and Mathematical Geophysics SB RAS, NOVOSIBIRSK
****IPGG SB RAS, NOVOSIBIRSK
N.V. Trufanova, Yu.A. Naumova, I.V. Ginzburg, V.A. Zaravnyaev
Optimizing velocity-depth model and improving accuracy of migration transformations based on VSP and well-log data
In the report VSP, well-velocity survey and GIS data, received more than for 50 years of geophysical researches in the south of the Siberian platform are presented. More exact models of average and interval velocity for territory by the area more than 100 sq. km are constructed. On concrete examples it is shown, that use of aprioristic models of velocity allows to raise accuracy of migration of seismic data and quality of the forecast of a pool.
A.N. Kremlev, G.N. Erochin, L.E. Starikov, M.A. Zverev
Forecast of fissured-cavernous reservoirs by scattered seismic waves
Results of geological media exploration using scattered waves extracted from multi channel seismic data are presented. The researches are based on original prestack migration method -Wave CDP method, which possesses possibility to construct two independent time sections: conventional image of reflectors and new image of space distribution of acoustic inhomogeneous - diffractors. The last are join with fracture zones - strong sources of scattered waves. Method was testes in areas with carbonate, volcanic and clay rocks.
YUNII IT, KHANTY-MANSIYSK
A.D. Pavlenkin*, Yu.V. Roslov**, N.N. Efimova**, A.N. Kremlev***
Methods for studying and accounting near-surface static corrections
Low velocity zone (LVZ) of Western Siberia sedimentary section is discussed. Standard multichannel seismic design contains enough information in order to construct LVZ velocity model. First arrival seismic tomography is applied for that purpose. Tomographic velocity model allows calculation of static correction for different datum levels. Comparison of results obtained with technology proposed and standard static technique are presented.
*FGUP VNIIOKEANGEOLOGIYA, ST.-PETERBURG,
**FGU NPP “SEVMORGEO”, ST.-PETERBURG,
*** YUNII IT, KHANTY-MANSIYSK
S.A. Zhgenty, B.V. Zaporozhets, D.P. Leschenko
Using synchronous PZ-receiving of vibrations at seismic prospecting in the transit zones for suppressing wave's interference in the receiver's near field
The article deals with a synchronous data recording by a vertical geophone (Z) and hydrophone (P) positioned on the bottom in TZ zone. It is proved that due to different sensor directivity multiple waves generated in the water layer are recorded with reverse polarity. Based on modeling investigations PZ a duel sensor summation algorithm was worked out which enabled to suppress receiver-side multiples. Here are represented the results of experimental testing of a new algorithm based on field data acquired in TZ zone on the river Vyatka and the North Caspian.
COMPANY “SI TECHNOLOGY”, GELENDZHIK
V.L. Trofimov*, V.A. Milashin*, F.F. Khaziev*, A.A. Kachkin**, A.B. Timonin**, G.A. Maltsev*
The studying of the structure and the evaluation of depositional environment thin-layered media by methods of VRS-Geo and well-logging
Seismic inversion applied to original seismic records and to migrated 3D seismic volume, as well as use of well logs from wells in the study area permitted structural framework along horizons U, X₁, X₂, B(J₀), P(J₁), T₁(J₂), T₂(J₃+J₄), T₃(J₅), T4(J₆) within the Lower Cretaceous and Jurassic sections and along the A pre-Jurassic surface to be established. The authors used available data to find out regularities in the distribution of sand reservoirs and shaly rock varieties and to reconstruct sedimentation environment by analyzing seismic facies and by employing electrometric models of facies as evident on well logs and high-resolution seismic data.
*OOO “MEGATSENTR-PLYUS”, MOSCOW
**TPP “URAYNEFTEGAZ”, URAY
I.V. Tischenko*, A.I. Tischenko*, A.A. Zhukov**
Seismic data quality control - problems and solutions
The experience of using and the current state of technologies applied in Russia for seismic data quality control (QC) during the 2D- and 3D-shooting, variants of algorithms for calculating individual attributes of seismic records and their effectiveness, quality evaluation criteria of seismograms and time slices are considered. The problems of finding a compromise between the requirements for cost, timing and quality of the work are discussed. Based on modern requirements for fieldwork, computing capabilities and software developing, main trends of developing and optimizing QC are reviewed. Provides examples of using interactive technology of QC developed by "GSD", realized on basis of the software package SeisWin for supervisor’s seismic data quality control in the field and on the part of the Customer at field data acceptance. The conclusion about the need of shift from widespread absolute requirements to the relative values of the used attributes, formed on the basis of statistical data obtained in the region and on the area of the seismic survey.
*OOO “GSD”, MOSCOW
** OAO “TNK VP MENEDZHMENT”, MOSCOW
On the issue of wide-azimuth seismic survey
OOO “MEGATSENTR-PLYUS”, MOSCOW
N.A. Karaev*, E.A. Kozlov**, G.N. Karaev*, Yu.P. Lukashin*, O.M. Prokator*, V.M. Semenov*
Physical modelling of porous fractured sites
In the development of the known methods plate modelling  proposed and implemented a new design of physical models that differ in the ability to simulate bulk porous fractured geological media with the specified parameters of open porosity and voids interporous. On fragmentary models studied features of the propagation of the wave fields formed on porous fractured objects with different content. It is shown that the main contribution to the wave field contributes interporous rough fracturing. A key design feature of the physical models development is to create a "big" base model with the possibility of testing modern 2D- and 3D-seismic technologies. On the example of 2D-simulation observations on seismic profiles MOB-CMP shows that the low contrast cracked and porous fractured fragmented model, included in the basic model in the form of modules, can be detected on the basis of multi-component observations.
*FGUNPP “GEOLOGORAZVEDKA”, St.-PETERBURG
**”PARADAIM GEOFIZIKAL”, MOSCOW
G.N. Andreev, A.V. Ivankin
Structure peculiarities Kungurian deposits within potassium salts of Gremyachinskoe on materials of high-resolution seismic
This paper is focused on seismic method (HRS) to map sail bearing deposits and potassium - magnesium member of Kungurian age. Fold -50, single charge of explosive - 125 gr. underbase of weathering. On the lime sections seismic anomalies in form of lenses are seen at the three levels. The lowest one is identified as potassium horizon. Correlation scheme of rhythmic layers is presented along of deep wells. Model of geological evolution of territory for Kungurian age is suggested. To solve more accurate tasks of geological study potassium layers inside of salt objects is possibly using of HRS-3D.
ZAOr “NP ZAPPRIKASPIYGEOFIZIKA”, VOLGOGRAD
V.V. Monahov, V.I. Ovchinnikov, A.V. Urusova, M.P. Shirobokov
The seismic method application at the diagnosis of subgrade railways in order to identify potentially dangerous objects
OOO “NPTS GEOTECH”, MOSCOW
A.V. Chernyakov*, O.V. Bogomolova*, V.V. Kapustin*, M.L. Vladov**, V.V. Kalinin**
Quality control of geotechnical constructions created by jet grouting
The article describes the possibility of quality control piles and arrays manufactured using jet technology
Jet grouting method
. Operational control is exercised through the use of bore-hole acoustic and georadar techniques. The main properties are reviewed the wave techniques. The application allows borehole acoustic surveys to monitor the quality of the soil consolidation on the basis of studying kinematics and dynamics of the propagation P-waves and tube waves along the axis borehole. Experience research shows sufficient promise joint application of acoustic and georadar borehole methods for determine strength properties and constructive buildings located in the ground constructions.
*OOO “NPO KOSMOS”, MOSCOW
Point spread function of migrated images
Diffraction operators transform acoustic properties to the observed wavefields. Vice versa, migration operators transform the observed wavefields to the seismic images. As migration operators are not the inverse operators, we want to know: what acoustic function was actually imaged and what was the point spread function (PSF) of the image? To solve these questions we consider small perturbations of a homogeneous medium and substitute Born approximation of the scattered field into migration. Thus we derive the PSF for an arbitrary seismic wavelet. Correct migration operators for complex heterogeneous media must have the same PSF.
Slavneft Oil & Gas Co., R&D Office, Tver, Russia