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Krasnov A.A.,Concern CSRI Elektropribor | Sokolov A.V.,Concern CSRI Elektropribor | Usov S.V.,TGS NOPEC Geophysical Company
Gyroscopy and Navigation | Year: 2011

Special features of using a Chekan-AM gravimeter in airborne gravimetric surveys are discussed. Software and procedures for gravimetric data processing are described. The results of airborne gravimetric surveys conducted in 2007-2009 on the shelf of Greenland are given. © 2011 Pleiades Publishing, Ltd.,. Source

Goloshubin G.M.,University of Houston | Chabyshova E.,TGS NOPEC Geophysical Company
6th Saint Petersburg International Conference and Exhibition on Geosciences 2014: Investing in the Future | Year: 2014

We consider a possible explanation of the seismic low frequency anomalies using converted Fast-Slow-Fast P-waves in a thinly layered porous permeable fluid-saturated medium. Wave propagation in highly interbedded permeable gas reservoirs suggests significant and anomalous amount of mode conversions between Fast and Slow P-waves, which may be observed from surface seismic reflection data. Those converted P-waves experience high frequency dependent attenuation. In case if some converted waves propagated only a short fraction of their travel paths as Slow P-waves they will be notably delayed and attenuated relative to Fast P-wave reflections. A model of sandstone reservoir with typical parameters is used to estimate time delays of the converted Fast-Slow-Fast P-waves and their influence into total reflected P-waves energy at seismic frequencies. Copyright © 2014 by the European Association of Geoscientists & Engineers. All rights reserved. Source

Chabyshova E.,University of Houston | Chabyshova E.,TGS NOPEC Geophysical Company | Goloshubin G.,University of Houston
Geophysics | Year: 2014

P-wave amplitude anomalies below reservoir zones can be used as hydrocarbon markers. Some of those anomalies are considerably delayed relatively to the reflections from the reservoir zone. High P-wave attenuation and velocity dispersion of the observed P-waves cannot justify such delays. The hypothesis that these amplitude anomalies are caused by wave propagation through a layered permeable gaseous reservoir is evaluated. The wave propagation through highly interbedded reservoirs suggest an anomalous amount of mode conversions between fast and slow P-waves. The converted P-waves, which propagated even a short distance as slow P-waves, should be significantly delayed and attenuated comparatively, with the fast P-wave reflections. The amplitudes and arrival time variations of conventional and converted P-wave reflections at low seismic frequencies were evaluated by means of an asymptotic analysis. The calculations confirmed that the amplitude anomalies due to converted P-waves are noticeably delayed in time relatively to fast P-wave reflections. However, the amplitudes of the modeled converted P-waves were much lower than the amplitude anomalies observed from exploration cases. © 2014 Society of Exploration Geophysicists. Source

TGS NOPEC Geophysical Company | Date: 2010-03-22

Prerecorded electronic media featuring geophysical data, namely seismic-data images; computer program for use in producing depth processed images from geophysical data. Computer services, namely, producing depth processed images from geophysical data; data conversion and digitization services, namely creating depth processed images from geophysical data for the oil and gas industry.

TGS NOPEC Geophysical Company | Date: 2014-01-21

Computer software for use on the oil and gas industry, namely computer software for seismic data processing, geophysical investigation of seismic data, and related seismic attribute and interpretation of seismic and related seismic attribute data, seismic prestack interpretation and analysis.

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