The nature of the margins of the Precaspian Basin remains one of the most controversial issues, which at the same time, is crucial for determining the prospects of oil and gas potential. The success of the Karachaganak field discovery in 1979 is still not repeated, which is due to the suboptimal modeling of objects of this kind. A new approach to understanding the conditions of formation of carbonate massifs in the inner part of the depression as a consequence of the gravitational sliding of rocks from the side of the margins is proposed. This approach will allow more productive work on the search for structures of the Karachaganak type.

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