--> Abstract: South Sakhalin--New Frontier of a Mature Exploration Area of the USSR, by P. B. Jones; #91012 (1992).

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ABSTRACT: South Sakhalin--New Frontier of a Mature Exploration Area of the USSR

JONES, PETER B., International Tectonic Consultants, Calgary, Alberta, Canada

Sakhalin Island is almost 1000 km from north to south. It has been producing petroleum since 1923. Exploration and development drilling has resulted in a current annual production of about 2.5 million tonnes. Production is from Tertiary sandstones and is restricted to a small area along the northern part of the east coast of the island, in structures associated with the East Sakhalin fault. Prospective areas further south are indicated by oil and gas shows in wells and by mud volcanoes, in different basins and structural settings.

Two problems that affect the onshore hydrocarbon potential are: (1) structures of the basin flanks, and (2) the nature of the three principal north-south-trending faults. These are the East Sakhalin (or Hokkaido-Sakhalin) fault, the Central Sakhalin fault, and the West Sakhalin fault. The East Sakhalin fault appears to be a strike-slip fault initiated in the Mesozoic, with about 70 km of late Tertiary dextral offset. Geologic and seismic profiles indicate that the Central Sakhalin fault zone combines features of both thrust and strike-slip faults. The overthrusting suggests the potential for oil- and gas-bearing structures beneath the east edge of the West Sakhalin Mountains and in other faulted basin margins.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)