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Abstract

The Berriasian – Hauterivian (Neocomian) sequence was deposited in an overall fluvio-marine environment. Significant paleo-relief existed at this time indicated by onlap of this unit onto partially eroded Jurassic carbonates. A lowstand period is identified in the Valanginian (Early Neocomian) which is associated with clear evidence of extensive channel development across much of the area. This interval is associated with distinct fining upward fluvial/estuarine channel sands recognized on log data and a corresponding increase in the proportion of non-marine palynomorphs identified in biostratigraphic samples. By the Late Barremian, most of the paleo-highs were submerged under a vast epeiric sea that extended across the region. Extensive shale units were deposited across the entire region. In the Aptian-Albian a large delta system prograded out into the presently offshore part of the North Caspian. Individual delta lobes can be tied and calibrated to log data which is characterized by classic coarsening upward para-sequences typically with high net/gross. A corresponding delta-top environment is recognized in the more proximal wells to the east with a distinctly higher proportion of non-marine palynomorphs consistent with a more proximal setting. Synchronous salt movement throughout the Early Cretaceous is observed on some of the salt diapirs within the Pri-Caspian Basin.

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/content/papers/10.3997/2214-4609.20145723
2010-11-15
2024-03-28
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20145723
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