... Geological and geophysical criteria for the allocation of a reef complex in the carbonate sediments of the Upper Devonian sectionare determined based on core analysis, log data and 3D seismic data on one of the fields of the Bashkirian arch. Uneven-aged reef masses are revealed. A geological model of the Frasnian-Famennian deposits of the Upper Devonian sediments with specificated zones of allocation and fluid content of reef reservoirs is proposed. Materials and methods Core, log data and 3D seismic ...

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