Мурманская МИЛЯ. 2018 г. №4.

EXPLORATIONS Fig. 1 Ice protection device installed on the stern of the RV AKADEMIK FEDOROV Рис. 1 Устройство ледовой защиты, смонтированное на корме НИС «Академик Фёдоров» the Russian marine geophysics. Speaking about innovative technologies in the perfor­ mance of geological and geophysical survey on the Arctic Shelf of Russia it is necessary to primarily name under-ice seismic survey, multicomponent seismic studies in transit zones and geophysical work during engi­ neering studies. Under-Ice Seismic Survey Technology 48 One of the most important scientific, tech­ nological and technical developments of our Oompany, especially at the time of import substitution, was the creation and implemen­ tation of the under-ice seismic survey tech­ nology. Currently, the leading Russian oil and gas companies have obtained licenses to de­ velop fields on the continental shelf of Russia, considerable part of which are covered by ice for most of the time. This technology will en­ sure compliance with license commitments by companies and timely development of oil and gas fields discovered with our assistance. On the basis of the developed technology of under-ice seismic survey we managed to carry out the pioneer integrated geophysical survey in the most difficult ice conditions of the central deep part of the Arctic Ocean. This technology is based on the ice protec­ tion device (IPD) (Fig. 1). When work is per­ formed in water areas covered with ice, there is a need to ensure the location of seismic equipment and air guns below water sur­ face in order to avoid contact of the towed equipment with ice. The IPD is installed on the stern of the vessel and allows fixing the cables of the air guns and the streamer along the device. Thus, it protects the towed equip­ ment from ice floating on the surface. The device installed on the vessel is made in the form of a streamlined column with an internal niche for laying and securing the towing and clamping cables as well as for placing the seismic equipment. In this case, the upper part of the ice protection device is located above the waterline of the vessel. The side walls of the column form a vertical niche and continue above the IPD attaching point with formation of fairings. At the same time, the vertical niche is made with a longitudinally di­ vided inner zone for laying and securing the towing and clamping cables and an external zone for placing the cables of seismic equip­ ment. The inner zone is divided into three longitudinal channels, each of which is de­ signed to allocate the towing and clamping cables for the air guns and seismic equip­ ment, as well as to fix the inoperative spare towing and/or clamping cables. Three rollers are designed to direct the streamer and the lines of the air guns. The dimensions of the structure are the following: height = 17.5 m, width of the un­ derwater part = 6.5 m. Total weight of the structure is 10 t. In 2015 the ice protection device was patented by MAGE [4]. A distinc­ tive feature of this scientific development is the fact that it was immediately implemented and used for government contract perfor­ mance by the Arctic-2014 expedition. Cur­ rently, there is no company in Russia that is able to perform the entire amount of such work independently. In this regard, an alli­ ance of qualified joint contractors has been established, the coordination of which has been entrusted to JSC MAGE as the main enterprise that accumulated a considerable experience in successful management of collective performance of integrated projects in the Arctic and Far East seas of the Russian Federation [4]. The main task that distinguished the ex­ pedition from all the previous ones was the performance of integrated geophysical sur­ vey with a view to creating a geological and geophysical basis for assessing the petro­ leum potential. The expedition was held un­ der the auspices of the Ministry of Natural Resources of the Russian Federation and the Federal Subsoil Resources Manage­ ment Agency of the Russian Federation. JSC MURMANSK MILE • 4-2018