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Seismic Survey Technologies
Guidelines for Authors
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M.S. Denisov¹, A.A. Kobzov¹, E.L. Mozichenko¹, S.V. Gorbachev², A.Y. Nikulnikov², T.V. Nurmukhamedov²
Developing a multiple elimination methodology with examples from Barents and Kara seas
Multiple attenuation schemes for shallow-water marine data are considered. Various algorithms are compared and the optimal data processing graph is chosen. Methodological recommendations are given and the results obtained are discussed.
¹GEOLAB Ltd, 119071, Moscow, Ordzhonikidze str., 12/4, Russia; e-mail: firstname.lastname@example.org ²Rosneft Shelf–Arctic Ltd.,, 121357, Moscow, Verejskaya str., 17, Russia; e-mail: email@example.com
The seismic waveforms of explosive sources
Seismic waveforms of explosive and impulsive sources used for seismic investigations have been always represented after their transformation by the subsurface and the recording channel. Seismic pulse is displayed as a wave train consisiting of several half-periods. And one can get the impression that the ground particles oscillate during the seismic wave propagation, and these oscillations are recorded by a seismic channel. In fact, this representation does not correspond to real processes taking place in the subsurface and during the propagation of a seismic pulse. In this paper we describe a model of the initial seismic pulse of an explosive source, and this pulse is graphically represented in the form of a bell. The electrical wavelet at the output of the seismic channel is a result of two-fold or three-fold differentiation by a transducer (an accelerometer or a geophone). And the frequency spectrum of the initial seismic pulse is subjected to complex low-pass filtering by multi-layer geological medium where seismic pulses propagate.
M.L. Vladov, N. A. Stepanov
Recognition types of underwater landscapes on the base of decomposition side ыcan sonar data by intensity and object size
This article is about interpretation of side scan sonar (SSS) data: recognition of underwater landscape. Here is provided review of some methods (on the base of neural networks) problems of them, given and tested method of filtration SSS data by intensity and object size for definition of landscape types.
Lomonosov Moscow State University, Department of seismics and geoacoustics, 119991, Moscow, Leninskiye Gory, 1, e-mail: firstname.lastname@example.org
G.D. Gorelik, A.P. Sisoev
Parametric method justification for upper part compensation in the CMP data processing workflow for the West-Siberian region
In the paper, different approaches aimed to take into account upper part heterogeneities are discussed for the Southern and Central parts of the West-Siberian oil and gas-producing region. For these areas upper part heterogeneities are presented by bulk parameters variations and moderate surface level changes (up to 100 m). As soon as upper part heterogeneities compensation with static corrections is ai med to compensate only for low velocity layer for the correct NMO velocities assessment, other (more correct) techniques are needed to address the problem.
Saint-Petersburg Mining University, 199106, Saint-Petersburg, 21 line, 2, Russia, e-mail: email@example.com, e-mail: Sysoevfirstname.lastname@example.org
M.I. Protasov¹, V.A. Tcheverda¹, A.P. Pravduhin², N.G. Isakov²
3D anisotropic imaging of 3D seismic data on the basis of Gaussian beams
The paper addresses 3D seismic depth true-amplitude migration of 3D irregular data in anisotropic media based on beam decomposition of the data. The main objectives are the development of the imaging procedure suitable for anisotropic media and handling 3D irregular seismic data without any preliminary regularization. The real data examples from Eastern Siberia are presented and discussed.
¹Institute of Petroleum Geology and Geophysics SB RAS, 3, Koptyug st., Novosibirsk, 630090, Russia, tel. (383)330-27-96, e-mail: ProtasovMI@ipgg.sbras.ru ²Ltd. InGeoService 625019, Tyumen, Respublika st., 211
Stable adaptive signature deconvolution
A data-driven optimization-based method of signature deconvolution is proposed. The inverse filter is computed from the theoretical signature and adaptively applied to the input data. The algorithm is stable in the sense that its application does not lead to random or coherent noise increase. Adaptation is applied within a sliding rectangular gate.
GEOLAB Ltd, 119071, Moscow, Ordzhonikidze str., 12/4, Russia; e-mail: email@example.com
K. G. Gadylshin¹, D.R. Kolyukhin¹, V.V. Lisitsa¹, M.I. Protasov¹, G.V. Reshetova¹, T.S. Khachkova¹, V.A. Tcheverda¹, A.A. Kozyaev², V.A. Kolesov², A.S. Merzlikina², V.V. Shilikov²
Use of scattered wavefield to locate fine cavernous layers in fractured formations of Yurubcheno-Tokhomskoye field
In the recent study of the Yurubcheno-Tokhomskoye field more and more attention is paid to the intervals with high cavitary. Current estimates of specialists working in this area forecast within these intervals about 30 % of geological reserves of hydrocarbons. At the moment the origin of these intervals and their areal distribution are unclear. To assess the possibility of seismic techniques, primarily, the method of the scattered waves, we perform full scale mathematical modeling. The choice of scattered waves is done because there is almost no hope to reveal these intervals in the reflected waves. In contrast, the high concentration of subseismic cavities produce intensive scattering which can be used to image these cavernous areas. To increase the resolution of images in scattered waves we use multicomponent Gaussian beams. In contrast to the plane waves used in conventional focusing transformations, Gaussian beams are much localized in the space, namely, they are concentrated within the exponentially narrow vicinity of some predetermined ray. Thereby, it becomes possible to study the local scattering in the spatial domain. The realistic model of the void space used to construct two scale elastic models for numerical experiments is obtained from 3D computer tomography of D = 100 mm core samples from the layers of intense caving.
¹Instiute of Petroleum Geology and Geophysics SB RAS, 630090, Novosibirsk, prosp. acad. Koptug, 3, Russian ²RN-KrasnoyarskNIPIneft
I. Bogatyrev¹, D. Semin,² T. Olneva², A. Inozemtsev³
The full azimuthal angle migration EarthStudy360® application during exploration of preneogenic basement within an oilfield in Republic of Serbia
The article describes full azimuthal angle domain pre-stack migration EarthStudy360® for the purpose of image quality enhancement in case of media anisotropy. ES360 workflow, techniques and anisotropic velocity model building stages are described. Model based 3D ray tracing results are also provided. Comparison of conventional PSTM, PSDM images and full azimuthal angle migration results is provided. The information value of additional attributes calculated during recommended workflow are analyzed.
¹NTC NIS Naftagas 21000 12 Narodnog fronta, Novi Sad, Serbia, Bogatyrev.firstname.lastname@example.org ²Gazpromneft NTC, 119000, Nab. Moyki reki, 75-79, Saint Petersburg, Russia, Semin.DG@gazpromneft-ntc.ru ³Paradigm geophysical, 119991, Moscow, 6, Leninsky prospekt, building 20, Russia
V.B. Leviant¹, I.E. Kvasov², I.B. Petrov²
Substantiation for direct detection and mapping of fractured formations based on using scattered compressional waves
The numeric simulation/modeling of seismic wave responses from a fractured reservoir formation (bed) has helped establish that the back scattering compressional waves generated by such bed have a broad zone of attenuated amplitudes almost to zero near the point source of energy generation. At offsets away from the point source location as far as the distance comparable to the reservoir bed depth, the scattered compressional wave strength increases substantially. This property of the scattered compressional wave is shown to persist in a wide range of conditions – parameters of fracture density and fracture tilts, signal frequency, and fractured bed thickness. On the vertical component data, a reflection from a smooth acoustic interface displays its maximum strength in the point source region, while on the far channels the reflection strength decreases appreciably. This difference in relationships of amplitudes or amplitude stacks between near and far offsets may be used for detection, mapping and parameterization of reservoir beds and local fractured zones.
¹Central Geophysical Expedition JSC, Narodnogo Opolcheniya str, 38, Bldg. 3, Moscow, 123298, Russia, e-mail: email@example.com ²Moscow Institute of Physics and Technology – MFTI, Institutsky per., 9, Moscow oblast, Dolgoprudny, 141700, Russia, e-mail: firstname.lastname@example.org, email@example.com