Siberian Research Institute of Geology and Geophysics

Siberian, Russia

Siberian Research Institute of Geology and Geophysics

Siberian, Russia

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Dunaeva K.A.,Siberian Research Institute of Geology and Geophysics | Sagaidachnya O.M.,Siberian Research Institute of Geology and Geophysics
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

The mathematical apparatus of wavelet transform includes wide collection of base wavelet functions and can be used for nonstationary signal processing including wave fields of elastic vibrations spreaded in geological medium. The possibility of localization of anomalies of signal component in seismic fields is important characteristic of wavelet transform on conditions that analyzing wavelet matches with the wave impulse of elastic vibrations. The results of wavelet analysis of seismic data after reverse transition from time-scale space of wavelet coefficients to space of time and coordinates are given in this article. The seismic data processing is carried out using the discrete wavelet transform based on Mallat pyramidal algorithm. The efficiency of wavelet filtration with decomposition of signal on detailed layers or wavelet coefficients muting by significant level with use of different classes of analyzing wavelets is shown on real seismic data. Wavelet filtration based on detailing layers of different levels with use of smooth Daubechies, Coiflet, and Symlet wavelets allows marking out and increasing the target signal component of seismic field, and muting the low-frequency regular noise (surface waves) and random noise with no significant change of local features of signal component in time/coordinate space. © 2010, European Association of Geoscientists and Engineers.


Sagaidachnya O.M.,Siberian Research Institute of Geology and Geophysics | Salnikov A.S.,Siberian Research Institute of Geology and Geophysics | Vershinin A.V.,Siberian Research Institute of Geology and Geophysics | Sagaydachny A.V.,Siberian Research Institute of Geology and Geophysics | Snmykov A.N.,Siberian Research Institute of Geology and Geophysics
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

Forming of seismic wave field is a complex process that depends on a number of physical phenomena, such as absorption, emission, scattering of elastic waves, as well as weak non-linear transformations of seismic energy. The study of these interdependent phenomena requires spatially distributed surveillance systems and a precision measuring channel with a wide frequency range (from almost 0 to 1000 Hz) for registration of elastic waves. The main parameter that limits the minimum level of recorded signals is the value of dynamic range of seismic channel. Typically, multidigit data registration provides a credible extraction of the informative component in the overall flow of information and therefore there is a possibility to study the energy weak individual elements of the seismic field. Spectral characteristics of recording channel circuit noise are particularly important as the spectral analysis of wave field, including microseismic noise, is a classic tool for seismic data processing and interpreting. The weak signal recording data, which was obtained by autonomous field recording units ROSA-A (Russia) by point group of geophones at the regional geotraverse deep seismic survey (distance up to 300 km) and coal seam detailed seismic survey in the mines, is presented. © 2010, European Association of Geoscientists and Engineers.


Kuznetsov V.,Siberian Research Institute of Geology and Geophysics | Salnikov A.,Siberian Research Institute of Geology and Geophysics
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

The Siberian platform is one of the high-prospect oil-and-gas bearing regions of Siberia. Numerous direct oil and gas shows and a number of gas (Kovyktinskoe, Chayandinskoe) and oil (Yurubchenskoe- Takhomskoe, Kuyumbinskoe, Verkhnechonskoe, Talakanskoe) fields discovered within the platform lead support to the high prospects for oil and gas. Despite intensive geological and geophysical studies, the Earth s crust of extensive Russia s territories, such as the Siberian platform, including its areas of junction with the West-Siberian plate, still remain to be studied by deep seismic methods. Because of this, it is very urgent to improve seismic-refraction methods for regional studies of the Earth s crust in regions difficult of access and data processing and interpretation techniques based on seismic tomography.The areas of junction of the West-Siberian plate with the Siberian platform were studied with the developed procedures. A rather dense network of regional seismic profiles made it possible to elucidate its deep structure with a high degree of reliability, i.e. to construct relief maps over the surface of consolidated crust and Moho discontinuity, to draw up charts over surfaces of rocks of basic and granulitic composition, boundary velocities on the Moho discontinuity.


Goshco E.Y.,Siberian Research Institute of Geology and Geophysics | Migursky A.V.,Siberian Research Institute of Geology and Geophysics | Salnikov A.S.,Siberian Research Institute of Geology and Geophysics
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

Seismic-acoustic inversion of the CDP section of the 2-DV-A reference profile running from the Pevek (Chaun Bay) to the Valunistoye (Central Chukot) has resulted in basic dynamic and geometrical characteristics such as an average reflector dip, and integral reflector energy. It is established that the behavior of a crust-mantle layer Moho is quite accurately observed on the seismic acoustic section. The integral energy section appears to be useful for identifying crustal blocks. The analysis of reflector dips on the 2-DV-A profile has shown that in its northwestern part (0-200 km) in the crystalline crust the inclination of reflections prevails obviously to the southeast. In the interval of 200-205 km in the crystalline crust and uppermost mantle, the vertical column of reflections with the northwestern inclination serving as a sharp boundary between large blocks of the Chukchi microcontinent has shown itself clearly. From 390 to 520 km the northwestern reflector inclinations are dominant in the crystalline crust, which corresponds to the movement of microblocks of the Koryak accretionary belt. The use of basic seismicacoustic attributes for geologic interpretation has supported the validity of the developed deep geologictectonic model of the earth s crust of the northern and central Chukchi microcontinent.


Kanareikin B.A.,Siberian Research Institute of Geology and Geophysics | Sagaidachnya O.M.,Siberian Research Institute of Geology and Geophysics | Dunaeva K.A.,Siberian Research Institute of Geology and Geophysics
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

When geological structure of oil and gas areas is examined with distance methods, it is important to consider the influence of the most changing upper part of the profile by use of static adjustments. Usually, if geological conditions were complex, the additional special field works are performed for examination of upper part of the profile, including microseismic survey of boreholes and observations by use of method of refracted waves. The alternative could be seismic tomography method of examining the velocities characteristics of upper part of the profile based on the data of first arrival of longitudinal waves. Particularly, this approach may be useful when the detailed area observations are obtained in regions characterized by complex and fast varying structure of upper part of the profile, i.e. regions with permafrost, with trappean tectonics, on the saliferous areas, in areas of large fractures. In this work the results of studying of velocity structure of the upper part of the East-Kamchatka though which obtained using seismic tomography processing of data gathered during the regional seismic observations (2005 - 2006) by SNIIGGiMS and Kamchatgeologiya are given.


Dunaeva K.A.,Siberian Research Institute of Geology and Geophysics | Sagaidachnya O.M.,Siberian Research Institute of Geology and Geophysics
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

Methodology of seismic data processing and analysis with use of wavelet filtration based on discrete wavelet decomposition of signal on detailed layers is considered. Discrete wavelet transform is implemented using the Mallat pyramidal algorythm. Level n detailed layer is formed as a signal reconstructed from level n detailed coefficients while wavelet coefficients of all other levels are zero. As all transformations are linear, complex wave field is decomposed on layers with different energy and frequency characteristics. The first detailed layer contains high-frequency components of initial data; the next layers contain more smooth (low-frequency) components. It is allowed and possible to construct additional detailed layers of wavelet decomposition if not only smooth wavelet coefficients but also detailed coefficients on each level are subjected to the discrete wavelet transform. It is important that wavelet filtration based on wavelet decomposition detailed layers makes it possible to keep local anomalies of signal component. Efficiency of methodology of wavelet decomposition on detailed layers under dynamic processing is demonstrated on real seismic data.

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