The Upper Devonian reefs are one of the main factors of oil accumulations within the Orenburg region. Development of seals in the structures of differential compaction over the Upper-Fransian single basin reefs is not well studied and associated with the main prospects for discovering and involving production of new oil reserves. Identification of true and false carbonate seals by core and log data is based on the techniques and criteria, which lead to targeted search of unexplored oil reserves in the Famennian reservoirs not only in the already discovered Carboniferous deposits, but also in evaluating the prospects for newly acquired licensed areas.


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