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SEISMIC SURVEY IN THE TRANSIT ZONE. FULL-SCALE TESTS OF THE KRAB SYSTEM. STAGE 1

https://doi.org/10.21821/2309-5180-2020-12-2-289-301

Abstract

Transit zones occupy a significant area of the coastal seas of the Russian Federation and have a great potential for hydrocarbon production. For exploring the hydrocarbon reserves in the transit zones, it is necessary to apply special equipment and methods of work. Currently, seismic survey in the transit zone is mainly carried out by imported equipment. Testing a new domestic system of KRAB seismic bottom stations is considered in the paper. At the first stage, the task to test 10% of randomly selected seismic bottom stations (SBS) out of 400 pieces is set. The test methodology consists of the following tasks: checking the correct location of the SBS center of mass to ensure proper installation on the bottom, testing the launching and lifting devices to install the SBS on the bottom subject to safety regulations on the vessel, conducting experiments with a seismic source to determine the operability of the SBS receiving channel, testing the bottom stations for the identity of seismic channels, software verification in the field. A technical description of the system and the results of the first stage of field tests are given in the paper. It can be confidently concluded that, in principle, the equipment in the form of separate SBS works within the parameters of the technical task and complies with the foreign analogues. However, in general, the complex is not ready not only for industrial testing, but even for full-scale testing and needs to be substantially improved. The rework should consist of the following: the compass and tiltmeters alignment, increasing the memory for collecting non-seismic data, reducing the excessive sensitivity of hydrophones, and developing a new complex of launching and lifting devices. The software needs to be modified to service the entire complex of 400 SBS.The performed tests represent only the first stage of testing the KRAB system since the equipment has a number of significant drawbacks after elimination of which it is necessary to fully test the system.

About the Authors

D. A. Ilinskiy
P. P. Shirshov Instituteof Oceanology of Russian Academy of Sciences
Russian Federation


K. A. Roginskiy
P. P. Shirshov Instituteof Oceanology of Russian Academy of Sciences
Russian Federation


O. Y. Ganzha
P. P. Shirshov Instituteof Oceanology of Russian Academy of Sciences
Russian Federation


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For citations:


Ilinskiy D.A., Roginskiy K.A., Ganzha O.Y. SEISMIC SURVEY IN THE TRANSIT ZONE. FULL-SCALE TESTS OF THE KRAB SYSTEM. STAGE 1. Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova. 2020;12(2):289-301. (In Russ.) https://doi.org/10.21821/2309-5180-2020-12-2-289-301

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ISSN 2309-5180 (Print)
ISSN 2500-0551 (Online)