Мурманская МИЛЯ. 2018 г. №4.

EXPLORATIONS I N N O V A T I V E T E C H N O L O G I E S IN T H E I M P L E M E N T A T I O N O F E N G I N E E R I N G SURVEY O N TH E A R C T IC SHELF O F RUSS IA KAZANIN A.G., KAZANIN G.S., IVANOV G.I., SARKISYAN M.V., MOROZOV V.E., CHERNIKOV D.I. (MAGE, MURMANSK, MOSCOW, ST. PETERSBURG) The article describes the innovative technologies implemented by JSC MAGEduring the offshore engineering surveys on the Arctic Shelf of Russia, which demonstrate the innovative vector of the development of domestic marine geophysics. High resolution seismic, ultra-high resolution acoustic surveying and work with a remotely operated subsea vehicle (ROV) should be mentioned as the most significant. Seismic high and ultra-high resolution seismic surveying were used for detailed identification of different types of rock units of the section upper part in order to detect gas «lenses» and deposits of gas hydrates, as well as to forecast shallow gas accumulations in the upper part of the section. The surveys performed in the Sea of Okhotsk using ROV showed its high efficiency in assessing the suspended and abandoned wells and the Kirinskoye field assets inspection. 40 This article focuses on the Arctic Shelf of Russia and technologies which demonstrate the innovative vector of development of Rus­ sian marine geophysics in engineering explo­ ration. Engineering exploration is a relatively new activity of the Company [2, 5]. Having commit­ ted to the innovative development the Company grasped new production technology - integrat­ ed engineering exploration which hasn’t been implemented by MAGE before. Entering this market the Company realized that something new should be offered, something that can’t be performed by other companies. As a result of innovative policy in recent years the Company have managed to develop modern integrated engineering exploration on the Arctic Shelf re­ quested by the leading Russian oil-and-gas companies - Rosneft and Gazprom. At present MAGE performs almost all types of engineering surveys including high resolution seismic, ultra-high resolution acoustic survey, bathymetric survey, shipboard magnetometer survey, side-scan sonar survey (SSS), cone penetration testing (CPT), bottom sampling, en­ gineering wells drilling, ROV survey and subsea operations, geodetics, lithodynamics assess­ ment, hydrometeorological and ecological ex­ ploration, monitoring of currents, waves level, tidal measurements, ice thickness etc. [3]. Besides standard techniques, innovative technologies used by MAGE for engineering survey performance should be mentioned, namely: high resolution seismic, ultra-high res­ olution acoustic survey, works and survey in­ volving ROV. Speaking about innovative technologies standard techniques in geophysical exploration should be also mentioned with reference to en­ gineering works performed on the shelf. De­ pending on the geological structure of the water area and geological tasks our Company imple­ ments almost the whole range of geophysical surveys. There is a wide range of seismic and hydroacoustic techniques. They include vari­ ous types of continuous seismoacoustic pro­ filing using single- and multichannel systems. Besides this there is an opportunity depending on the section type and tasks to choose high resolution type using electrodynamic source of Boomer type with 0.5 kJ charge energy, with central frequency of 4,000 Hz or using a pa­ rameter profiler with primary frequency of 100 kHz and differential frequencies in the range of 6-15 kHz, or a low frequency type with a spark- er with capacity reaching 16 kJ with radiation frequency - 400-600 Hz or an air gun. Low frequency continuous seismoacoustic profiling is performed applying a multichannel system. Multibeam echo sounder (MBES) and side scan sonar (SSS) sounding are applied for specification of bottom relief and morpho- structures. Besides this, SSS allows identifying and quartering potentially hazardous objects on the ocean bottom. For this purpose MBES survey is conducted as well as various sonar systems. Shipboard magnetometer surveys MURMANSK MILE • 4-2018