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Structure of the Sedimentary Cover on the Mendeleev Rise According to Multichannel Seismic Reflection Studies ('Arctic-2012' project)

Sergey Kashubin

Integrated geological and geophysical studies were conducted in 2012 in the central Arctic Basin (joint efforts of different organizations under the leadership of JSC 'Sevmorgeo'). Multichannel seismic reflection studies (MCS) were carried out for a detailed structural study of the upper section of the Earth's crust – sedimentary cover. One South-North line along the Mendeleev Ridge and several West-East lines crossing the Mendeleev Rise in its northern, central, and southern parts were worked out in the project framework. Observations were made with towed Sercel SEAL Streamer either with 4500-m-long (360 channels) or with 600-m-long (48 channels) streamer, depending on ice conditions. Excitation of elastic waves was produced by a group of Bolt ARG 8500 Previous HitairNext Hit Previous HitgunTop sources (total volume ranged 1,025-2,050 cub.in) with source points spaced at 50 m. MCS contractor was WGP Exploration Limited. Observations on MCS lines, run with a short (600-m-long) streamer, were accompanied by sonobuoy reflection-refraction seismic soundings in order to determine a velocity model of the upper crust section more accurate. To register reflected and refracted waves, single radio telemetry modules (sonobuoys) were used. Average sonobuoy spacing was 40 km; excitation point spacing – 50 m, offset range – from 0 to 25 km. Accomplished seismic reflection CMP investigations enabled to trace continuously the main sedimentary complexes from the Siberian Shelf to the underwater Mendeleev Rise and to study the nature of the Mendeleev Rise junction with framing structures

AAPG Search and Discovery Article #90177©3P Arctic, Polar Petroleum Potential Conference & Exhibition, Stavanger, Norway, October 15-18, 2013