Мурманская МИЛЯ. 2018 г. №4.

EXPLORATIONS IN T E G R A T E D G E O P H Y S IC A L E X P L O R A T IO N O F TH E C E N T R A L D E E P -W A T ER PART O F T H E A R C T IC O C E A N KAZANIN G.S.1, POSELOV V.A.2, ZAYATS I.V.1, IVANOV G.I.1, MAKAROV YE.S.1, VASILYEV A.S.1, SMIRNOV O.E.2 (1 - MAGE, Murmansk, Moscow, St. Petersburg, 2-VNIIOkeangeologia, St. Petersburg) The article considers new data obtained as a result of applying innovative tech­ nologies of JSC MAGE when researching the central deep water part of the Arctic Ocean. The results of the performed works made it possible to create an adjusted seismostratigraphic model in correlation with the ACEX IODP 302 well data on the Lomonosov Ridge. Continuous tracking of sedimentary sequences from the shelf to the adjacent deep water area allows making a conclusion that the history of de­ velopment is common for the structures of the East Arctic continental margins and the province of the Central Arctic underwater uplifts. 62 In previous years [1, 2, 5, 8, 10, 12] in co­ operation with a number of organizations a suf­ ficient scope of hydrographic and integrated geophysical survey was performed in the area of the North Pole. The survey objective was the jus­ tification of external boundaries of the continental shelf of the RF Arctic zone. The obtained results being published [1, 2, 5, 8, 10, 12] turned out to be highly informative. However there have oc­ curred new items for further detailed surveying. The main objective of expedition Arc­ tic-2014 making it different from all previous expeditions was performance of integrated geophysical survey aimed at creation of geo­ logical and geophysical basis for petroleum potential assessment on the continental shelf of the Arctic Ocean beyond the limits of the 200-mile exclusive economic zone. The main geological objectives of the expedition hav­ ing performed such integrated geophysical survey for the first time were as follows: - detecting of geological and structural correlations of sedimentary basins of the near-slope Vilkitsky Trough and adjacent Podvodnikov Basin with shallow water shelf of east Siberian seas; - determining of configuration and param­ eters of sedimentary basins, the thickness and structure of sediments and the Earth crust structure; - determining of the sedimentary cover thickness in certain sectors of the Amunds­ en basin (Nansen, Makarov, Podvodnikov II); - exploration of bottom relief along all sur­ vey routes. The exploration covers deep- and shal- low-water parts of the Arctic basin. Main positive structures in the deep water area are the Gakkel Ridge, Lomonosov Ridge and the Mendeleev uplift, which separate the Nan­ sen, Amundsen and Podvodnikov basins. The Arctic seas shelves refer to the shallow sur­ vey area. Sufficient part of project lines cross the continental slope. In present no organization in Russia can perform the whole scope of such works through its’ own efforts. In this regard there has been created an alliance of joint contrac­ tors, coordinated by JSC MAGE as the chief company highly experienced in successful management of group implementation of in­ tegrated projects in the Arctic and Far East seas of Russia [4]. Technique The most important has become the cre­ ation and implementation of sub-ice seis­ mic technology. At present when the leading Russian oil-and-gas companies have subsoil licenses for the development of the Russian Continental Shelf fields the sufficient part of which are covered with ice almost all year round. This technique provides performance of license obligations by companies and timely implementation of oil-and-gas fields discovered through our assistance. This technique is based on the use of ice protection device (IPD). It is applied for tow­ ing of an iceseismic equipment and air guns MURMANSK MILE • 4-2018