This paper is concerned with the structure and genesis of the Talakh, Khamaky, and Botuobiyan Horizons of the Chayanda oil and gas-condensate field, located on the northeastern slope of the Nepa-Peledui dome of the Nepa-Botuobiyan anteclise. It is shown that the models for these horizons are dip-lenticular rather than plane-parallel. The producing horizons are characterized by significant lateral and vertical inhomogeneity related to the sedimentation conditions. The deposits formed in the setting of a sea coast, which evolved from a rock-type coast with the strongly dissected relief of the sea bottom (Talakh Horizon), gradually acquiring geomorphologic elements typical of open sea coast. This evolution provided a set of facies making up the producing horizons: The Talakh Horizon is dominated by the turbidite facies; the Khamaky Horizon, by the facies of the cis-frontal zone of the beach; and the Botuobiyan Horizon, by the facies of the beach and its cis-frontal zone. The lateral and vertical inhomogeneity intensifies in the horizon sequence: Botuobiyan-Khamaky-Talakh.

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