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PETROLEUM POTENTIAL OF CRETACEOUS SYSTEM AND ITS POSITION IN LITHMO- AND SEQUENCE-STRATIGRAPHY MODELS
Cretaceous is usually considered as the major geologic system regarding reserves and production of hydrocarbons. It hosts supergiant and giant oil pools of the Arabian Plate and Mesopotamian Trough, Sirt petroleum province in Libya, Gulf of Mexico in the USA, Western Siberia, and giant oil sands (bitumen) field in Athabasca, Canada, giant Urengoiskaya-Yamburgskaya gas-bearing zone in Western Siberia, being unique in reserves quantity and world-largest in production. In the lithmostratigraphic model Cretaceous system represents two different spatiotemporal parts of adjoining large rocky-layer systems, necsocyclites (gigacyclites), and in the sequence-stratigraphic model it represents a significant part of one megasequence. The analysis of appropriateness and substantiation of the Cretaceous strata position in these two models that the article is dedicated to.
Key words: Cretaceous system, lithmostratigraphy, sequencestratigraphy, cyclite, sequence, rock-layer systems, lithmostratigraphic model, petroleum potential.
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