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CONTENT
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Currently selected
Page Content
V.M. Glogovsky
pages 6-11
Structural stability of algorithms for estimation of velocity and depth parameters of the medium
The inverse seismic kinematical problem is considered. Its correctness is discussed. Structural stability of inversion is studied. Examples are given.
A.A. Shevchenko
pages 12-18
Accuracy evaluation method for the CDP velocity analysis
A general problem of accuracy evaluation is very important for the CDP velocity analysis made by the vertical or horizontal velocity spectra interpretation. The main idea of the precision estimation is based on dependence between the velocity spectra structure and two parameters: wavelet frequency and dispersion of the arrival time curve approximation. For the aim of the velocity spectrum sensitivity threshold evaluation Marechal criteria was introduced. Based on the introduced strategy the modeled data have been analyzed. Offset dependence of the velocity analysis were investigated. This example is describing the uncertainty of the effective velocity estimation.
Schlumberger Moscow Research, Pudovkina str., 13, Moscow, 119285, Russia,
e-mail:
AShevschenko@exchange.slb.com
Yu.N. Dolgikh
pages 19-26
Reference velocity model of the nearsurface as a factor resulting in non-uniqueness of inverse kinematic problem for seismic exploration using CMP method
Ill-posedness of inverse travel time problem the CDP method in seismic exploration is an important problem. Non-uniqueness is one of fundamental feature of travel time inversion, i. e. existence of many solutions – velocity-depth models with travel time attributes (
t₀
,
V
CDP) fitting the data. In the same time, many algorithms of velocity-depth modeling (including tomography) have in their base minimization criterion of difference between travel time attributes of the model and initial data – for some assumptions about the type of inhomogeneities. This paper demonstrates results based on forward travel time modeling of experiments allowing to evaluate consequences of using simplified layer models of the near surface section, in case of using a misfit minimization criterion for travel time attributes (
t
₀,
V
CDP). We provide some recommendations and emphasize the importance of the problem of information deficit about the near surface properties.
ZAO NPTs SibGeo, Nemtsova str., 22, Tyumen, 625002, Russia,
e-mail:
ggeruss@yandex.ru
D.A. Nasyrov*, D.A. Kiyashchenko**, Yu.V. Kiselev*, B.M. Kashtan*, V.N. Troyan*
pages 27-34
Updating of the velocity model with vertical seismic profile data with use of migration of multiples for isotropic and transversely isotropic media
We investigate the new method that combines the migration of VSP data and updating of the velocity model. The method is based on the comparison of subsurface images obtained by using different types of waves: the primary reflections and surface-related multiples. As a measure of similarity of the images we use the functional based on cross-correlation. Estimation of the velocity model parameters is carried out by maximization of this functional. Therefore the resulting velocity model provides the maximal similarity between images obtained by using the primary reflections and surface-related multiples. We develop an iterative procedure to maximize the functional and demonstrate the efficiency of the method using the synthetic walk-away data. We consider the recovery of the velocity parameters in the layer with linear velocity dependence in horizontal and vertical directions in the case of the inclined base of the layer. We demonstrate an efficiency of the method for curvilinear reflecting interfaces. The results of the numerical simulation on determination of the Thomsen’s parameters ε and δ for transversely isotropic model with the vertical symmetry axis are considered.
*St.-Petersburg State University, Ul’yanovskaya str., 1, Petergof, St.-Petersburg, 198504, Russia,
e-mail:
dnasyrov@earth.phys.spbu.ru
**Shell International E&P, e-mail:
Denis.Kiyashchenko@shell.com
E.A. Kurin, M.S. Denisov
pages 35-40
Application of high-performance computing to seismic multiple attenuation
Multiple reflections recorded during marine seismic acquisition mask the primary waves. Attenuation of multiples still remains one of the most challenging problems of real data processing. The SRME algorithm is among the most efficient demultiple schemes. Its appluication for 3D real data processing requires a huge amuont of computations. The paper presents a computationally efficient 3D SRME method that provides high scaling for computers with thousands of nodes. Practical application of the developed code allowed for com- putationally efficient multiple attenuation for data from various regions.
GEOLAB Ltd., Prophsoyuznaya str., 126, kv. 3, Moscow, 117321, Russia,
e-mail:
ekurin@geo-lab.ru
,
denisovms@gmail.com
V.B. Leviant*, I.B. Petrov**, I.Е. Kvasov**
pages 41-61
Numerical modeling of seismic response from subvertical macrofractures as possible fluid conduits
A characteristic gridding method is used to model seismic wave propagation in macrofractured subsurface where macrofracture length is comparable with seismic wave length. Thorough examination is made of diffractions that form seismic response from subvertical macrofractures – possible fluid conduits in oil and gas reservoirs. Evidence is provided that macrofractures, if fluid-filled, are best identifiable on the horizontal component of recorded converted diffractions, while gas-filled macrofractures are well seen on the vertical component of recorded
P
-diffractions.
*Central Geophysical Expedition, Narodnogo Opolcheniya str., 38, Bldg. 3, Moscow, 123298, Russia,
e-mail:
vbleviant@gmail.com
**Moscow Institute of Physics and Technology – MIPT, Institutsky per., 9, Moscow oblast, Dolgoprudny, 141700, Russia,
e-mail:
petrov@mipt.ru
,
i.kvasov@gmail.com
S.M. Glubokovskikh, S.A. Kaplan, V.E. Rok, Yu.A. Titiova
pages 62-69
Theoretical and experimental investigations of effect of aligned vertical fracturing on effective seismoacoustic properties of rocks
The paper concerns with a method of evaluation effective seismic properties of vertical fractured rocks based on the theory of linear slip surfaces. Basic theoretical and practical issues of the method are stated. Extensive joints and penny-shaped cracks are examined, relations between expressions of effective seismoacoustic parameters of such fractured media are determined. Results of physical modeling of seismic waves propagation in porous-fractured media are compared with theoretical estimations. It is shown that Hudson’s theory predictions diverge from experimental results. Kinematic parameters of recorded signals are in good agreement with theoretical estimations for energy transfer velocity in porous-fractured media obtained in frame of the theory of linear slip surfaces. Examined physical models possessed considerable spatial dispersion which required to take into account difference between group and phase velocities. Utilized approach is valid for effective description of wide range of fractured rocks.
VNIIgeosystem, Varshavskoye shosse, 8, Moscow, 117105, Russia,
e-mail:
stas.glubokovskikh@gmail.com
A. Stovas
pages 70-74
The unphysical qP-wave caustics in acoustic VTI media
I analyze the unphysical caustics for
qP
-wave in acoustic transversely isotropic media with vertical symmetry axis. Caustics appear at a large negative anelliptic anisotropy parameter as it shown for the geometrical spreading factor and the phase velocity.
Department of Petroleum Engineering and Applied Geophysics, Norwegian University of Science and Technology (NTNU), S.P. Andersenvei 15A, 7491 Trondheim Norway,
e-mail:
alexey.stovas@ntnu.no
I.O. Bayuk
pages 75-82
Multidiscipline approach to determination of effective physical properties of reservoir rocks
A unified approach has been proposed for simultaneous determination of the elastic and transport properties of reservoir rocks. The transport properties include the electrical and heat conductivity, hydraulic permeability, and permittivity. The approach is based on the effective medium theory that makes it possible to relate the macroscopic (effective) properties of reservoir rocks with the respective properties of solid skeleton, fluid filling the pore space, pore/crack geometry, and pore connectivity. This approach allows one to solve the following actual problems of prospecting geophysics: to determine the geometrical characteristics of reservoir porous space; to explain correlations observed between different physical properties; to estimate “nonmeasurable” properties from the measured ones; to detect cracked zones in carbonate reservoir rocks and determine their characteristics; to predict the physical properties of reservoir rocks at different scales; to reconstruct complete stiffness tensor (or tensor of transport properties) of anisotropic rock from limited number of measurements insufficient for using standard procedures; to build scale-dependent velocity models of shales with allowance made for their anisotropy needed to monitor the hydrofracture development.
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Bol’shaya Gruzinskaya str., 10, Moscow, 123995, Russia,
e-mail:
ibayuk@yandex.ru
M.Yu. Podberezhnyy*,***, V.A. Kulikov*,**
pages 83-87
Variations in velocity of compressional waves propagating in geological formation under DC current action
The measurements of cross electric and seismic effects were performed in the natural conditions using VSP tools (SEISZOND). We observed significant changes of seismic first break time versus time of DC electric passing through the media. It is concluded that electrolysis of ground water is a probable mechanism of these phenomena.
*Novosibirsk State University, Pirogova str., 2, Novosibirsk, 630090, Russia,
e-mail:
mpodber@mail.ru
**Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Acad. Koptyuga prosp., 3, Novosibirsk, 630090, Russia,
e-mail:
KulikovVA@uiggm.nsc.ru
***Baker Hughes Incorporated
S.N. Kashubin, T.S. Sakulina, N.I. Pavlenkova, Yu.P. Lukashin
pages 88-102
Characteristics of compressional and shear waves generated in marine deep seismic studies
During deep seismic studies offshore, thick water layer hinders estimation of velocities in the sedimentary cover and the upper consolidated crust. Primarily, this is due to the fact that in first arrivals there are no turning and refracted waves propagating in these layers. But in multi-component measurements with bottom stations, it is possible to use for interpreting converted and multiple waves related to these intervals of the section. Using the multiple and converted waves, one can evaluate the
P
- and
S
-waves velocities in the sedimentary strata and the upper consolidated crust. The case study of the multi-wave interpretation of seismic data along the profile in the deep water South Okhotsk basin is described in the paper. Velocity parameters of the section resulting from the interpretation allow the identification of the Earth’s crust in this region as thinned and extended continental crust.
VSEGEI, Sredny prosp., 74, St.-Petersburg, 199106, Russia,
e-mail:
Sergey_Kashubin@vsegei.ru
A.I. Kerusov*, V.S. Parasyna**
pages 103-117
Organization of large-scale land seismic acquizition 3D Q-Land SPARSE-VIVID (Gadames basin, Libya)
The methodology of large-scale seismic land acquisition is described on example of Gazprom Libya case-study operations in desert environment of Libya in Area 64. The details of the acquisition preparing are shown, as well as general estimations of technical and economical efficiency of possible approaches. Detailed description of the selected final interactive approach was given in the article, which started with 3D SPARSE survey to cover huge area, and ended, based on interactive seismic data processing and interpretation, by putting and selection of optimal location and parameters of the dense 3D VIVID cube. All works were done using the Q-Land technology of the WesternGeco company. In the article, results of using of the Q-technology are shown (examples of coherent noise and aliasing attenuation are given) and data with characteristic low-frequency components (as results of using of MD-sweep and GACs receivers) are demonstrated.
*Gazprom Geologorazvedka Ltd., Severo-Yeniseiskaya str., 33, Krasnoyarsk, Krasnoyarsk Region, 660075, Russia, e-mail:
A.Kerusov@grr.gazprom.ru
**Gazprom Ltd., Nametkina str., 16, Moscow, USP-7, 117997, Russia, e-mail:
V.Parasyna@adm.gazprom.ru
V.A. Bagmut*, V.A. Ryumin**, A.V. Bagmut***
pages 118-122
Real and imaginary advantages of digital probes for vertical seismic profiling
The article is devoted to the comparative analysis of possibilities of VSP equipment, equipped with various variants of digital transmission systems and time modulation system, depending on temperature and a lengths of geophysical cable. We make conclusions concerning dependence of the basic characteristics of digital borehole probes on a ration of the cable length and a speed of the sending device.
*Private enterprise “Geofizpribor”, Sovetskaya str., 110/12, Village Chisten’koe, Simferopol, 97570, Crimea, Ukraine, e-mail:
bagmut@bk.ru
**Private joint-stock company “Geophysical company NADRA”, Dubovitskaya str., 28, Kiev, 04114, Ukraine
***The Crimean geophysical expedition “Krymgeofizika”, Bespalova str., 47, Simferopol, 95007, Crimea, Ukraine, e-mail:
geophys@sf.ukrtel.net
pages 123
Памяти Игоря Владимировича Тищенко
pages 124-125
Список материалов, опубликованных в журнале в 2011 г.
pages 126
Алфавитный указатель авторов к списку материалов, опубликованных в журнале в 2011 г.