Home – Home – Jornals – Russian Geology and Geophysics 2002 number 7

The State Unitary Enterprise for Arctic Sea Engineering-Geological Expeditions (SEA ASIGE), Murmansk, carried out surveys in the north-eastern Pechora Sea. As a result, peculiar structures were revealed at the top of the sedimentary cover and anomalous features in the bottom topography. The anomalous bottom features are Pingo-like (Bulgunnyakh-like) rises with the base 20-60 to 100-130 m wide and with a relative altitude of 10-25 m. These rises are drastically highlighted on the smooth gentle surface of the bottom. They are made up of frozen ice-saturated deposits. On the domes of diaper-like uplifts, the roof of frozen icy deposits occurs at a depth of less than 0.5 m beneath the surface of the bottom, and their thickness reaches 100 m and more. At the sites between these uplifts the roof of the frozen grounds lies at a depth of about 15-20 m from the bottom surface with the thickness of the frozen unit of about 30 m. One of the wells drilled between diaper-like uplifts penetrated an overpressure gas accumulation at a depth of 50 m below the bottom surface.