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ABSTRACT: Sequence Stratigraphy of the Triassic in the Barentsz Sea

L. J. Skjold, P. M. Van Veen, J. Gjelberg, S. E. Kristensen, A. Rasmussen, P. H. Skott, T. Stolan

A regional study of the Triassic in the Barentsz Sea (20-32°E, 71-74°N) revealed sequences that correlate seismically for hundreds of kilometers. Recent offshore drilling results enabled us to establish a biostratigraphic time framework. Comparisons with information from onshore outcrops (such as the Svalbard Archipelago) aided the piecing together of these superregional sequences.

Seismic character analysis identified three units with composite progradational patterns (Induan, Olenekian, and Anisian). Fluvial, deltaic, and marine deposits can be distinguished and located relative to the paleocoastlines. Corresponding downlap surfaces suggest the development of condensed intervals, predicted to consist of organic-rich source rocks, as was later confirmed by drilling.

Regional predictions based on this sequence-stratigraphic approach have proved valuable when correlating and evaluating well information. The sequences identified also help define third-order sea level curves for the area; these improve published curves thought to have global significance.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990