Sakhalin

The offshore Sakhalin area in the Sea of Okhotsk is a world-class hydrocarbon province, with proven reserves to date in excess of 5.5 billion barrels of oil and 35 trillion cu.feet of gas. Total reserves (in place) in the area are estimated to be in excess of 90 billion barrels of oil equivalents.

The sedimentary sequence offshore Sakhalin consists mainly of Tertiary rocks, deposited by the prograding paleo-Amur River system. Reservoir rocks are mostly Neogene in age. Middle Miocene to Pliocene reservoir sandstones are continental to marine in origin, with the most recognized formation names being Dagi, Okobykai, and Nutovo. Their source rocks are laterally equivalent shale facies and perhaps underlying organic-rich siliceous rocks. Traps are mainly anticlinal structures caused by north-south trending strike-slip movement and compression.

Exploration in the area has to date been restricted to a narrow corridor along the north-eastern coast of Sakhalin. Outside this area, the offshore Sakhalin is very much under-explored.

The seismic line is a line from the SA04 survey acquired by TGS and DMNG in 2004. This was the first modern, high-quality, dataset providing coverage in these under-explored areas. As demonstrated on this line, the survey has confirmed the presence of thick sedimentary sequences and large structures in the deepwater part of the Derugin Basin. Various HC-indicators, like gas-chimneys and shallow amplitude anomalies, strongly indicate the presence of a live hydrocarbon system also in the deep-water areas.

TGS and DMNG are planning further acquisition in this area during the summer of 2005.

For additional information please contact:

Erling Frantzen
Sales Manager
Tel: +47 31 29 20 62
Email: erling@tgsnopec.no