Abstract: Triassic deposits of the Barents sea: facies, generating strata, reservoir rock prediction

BELONIN, M. D., E. A. MARGULIS*, and Yu. N. GRIGORENKO

Triassic deposits have widespread occurence in the Barents sea; their thickness ranges from hundreds of meters up to 6 km. They formed as a result of intensive supply of clastic material from the uplifting Ural orogen. The main mass of these deposits was buried in the margin part of the sea basin compensating the region of intensive downwarping.

In the Prenovozemel and Predural regions, in the conditions of the submontane depressions, the molasse red-variegated formations have been formed. They are characteristic of the southeast part of the Barents sea. North and west of the source area continental deposits are replaced by lagoon-continental ones representing the formations of vast sebkha (sections of the North Kildin and Murmansk areas); and further by shelf grey facies (sections of the Arctic, Ludlov, Shtokmanov, and Fersmanov areas, North and Kheisa wells - ZFI). In the northwest part of the Barents sea, the Lower-Middle Triassic clinoforms fix the edge of the shelf zone and the limits of relatively deepwater sedimentation zone (sections of Svalbard archipelago and Nagur well - ZFI).

In the limits of the deepwater sedimentation zone, the main generating bituminous-clayey Triassic stratum (T1-2) is present. It contains 5-11% of sapropelic organic matter. Its analogies are determined in the shelf zone (North and Kheisa wells -ZFI), and they are supposed in the North Barents depression and in the northwest part of the South Barents depression.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria