Geology, geography and global energy

Scientific and Technical Journal

Improving seismic technology in estuary and flooded land areas

2014. №4, pp. 76-90

Zakharov Nikolay V. - Deputy Chief Geologist, State Scientific Centre “YUZHMORGEOLOGIYA”, 20 Krymskaya st., Gelendzhik, 353461, Russian Federation, zacharov@ymg.ru

Rudakov Aleksandr V. - Post-graduate student; Chief Geophysicist, State Scientific Centre “YUZHMORGEOLOGIYA”, 20 Krymskaya st., Gelendzhik, 353461, Russian Federation; 149 Stavropolskaya st., Krasnodar, 350040, Russian Federation, rudakov@ymg.ru

Shumskiy Boris V. - C.Sc. in Technical Chief Engineer Deputy General Director, State Scientific Centre “YUZHMORGEOLOGIYA”, 20 Krymskaya st., Gelendzhik, 353461, Russian Federation, shumskyi@ymg.ru

Gulenko Vladimir I. - D.Sc. in Technical Professor, Kuban State University, 149 Stavropolskaya st., Krasnodar, 350040, Russian Federation, gulenko@fpm.kubsu.ru

The work discusses basic elements of new advanced seismic exploration technology in estuary and flooded land areas: submersible pneumatic sources, improved SVG-6 receivers, multichannel digital cable telemetric ARAM ARIES II system and a specialized vehicle - universal track-type amphibious platform on which a "shot point" is installed. The purpose of the work is the analysis of the above-mentioned technology testing results under conditions of estuary and flooded land areas in Temryuk district of Krasnodar Region. In the course of field trials, experiments were carried out in order to detect an optimum depth for an underground immersion of source points, as well as the required quantity of accumulations in the source point depending on the mean-square level of noise at the output of the receiver. Results of the research are presented in the form of diagrams of seismic recording attributes such as averaged signal amplitude, spectral width, and dominant frequency, signal-to-noise ratio received according to the initial seismographic records and also after their preprocessing. The experiments carried out showed that with the increase in number of sources from one to two as well as their immersion depth from 2 to 6 meters and number of accumulation from 2 to the 8, an amplitude of records and a signal-to-noise ratio increase consistently, changes occur in spectral width and dominant frequency, however the field work productivity decreases concurrently. Considering that the preprocessing of seismographic records levels substantially all differences in the initial seismic records, an immersion depth of sources and number of accumulation at each point should be chosen according to the technical requirements and specific weather conditions depending on the mean-square level of noise at the output of the receiver.

Key words: сейсморазведка на мелководных акваториях, лиманно-плавневые зоны, пневматические источники упругих волн, цифровые телеметрические системы, транспортные средства амфибийного класса, seismic exploration in shallow water areas, estuary and flooded land areas

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