Seismic instruments: article

Y.P. Ampilov
M.L. Vladov
M.Y. Tokarev
Lomonosov Moscow State University
Journal: Seismic instruments
Tome: 54
Number: 4
Year: 2018
Pages: 42-65
UDK: 550.834 (26)
DOI: 10.21455/si2018.4-4
Keywords: marine seismic exploration, shelf, multi-component data acquisition, dual-sensor detectors, permafrost, seismo-acoustic
Аnnotation: The results of comparison of marine seismic exploration technologies are laid down as far as broadband acquisition is concerned. With regard to the above mentioned the specific aspects of conventional, the so-called “oil” seismic exploration (which operates in the range of the first dozens hertz with a depth of several kilometers), as well as the so-called “engineering” seismic exploration (which registers signals in the range from hundreds to thousands Hz and covers the detailed structure of sea deposits to the depths of several hundred meters below the bottom) are examined. Normally, these two exploration types are conducted by different teams that do not cross. Still, exploration methods and approaches have a lot in common and this article addresses this problem from a common viewpoint for the first time. The analysis is based both on articles published by various geophysical companies as well as experimental data acquired by the authors of the present article using the proprietary modifications of seismic-acoustic methods for tiered observations. The efficiency of modification is demonstrated in Arctic water areas, particularly in the study of permafrost areas in the near-surface section. In the present article we examined the towed acquisition systems as well as ocean bottom cables and networks with multi-component sensors, including fibre optic technology. The latter have the advantage when using long-term observation systems for the purposes of marine oil and gas recovery monitoring (4D seismic). Analysis of common problems of marine seismic in conventional and high frequency bands has shown that it is time to review the common concept of seismic exploration in water areas that has not been revised in decades. One of the possible ways could be the elaboration of a uniform total system of observations in all frequency bands with a common data processing and interpretation cycle. The findings have practical value for the development of the strategy of the geophysical survey of the sedimentary cover in hard-to-reach water areas.