Samar Oblast, Russia. Buzuluk Depression, Lower Carboniferous and terrigenous Devonian deposits.
Exploration task; depth of investigation: 800-3100 m
Based on the results of the LFS study in the area of the previously identified oil field, a single oil-prospecting region has been identified along the Lower Carboniferous-Devonian deposits, covering two uplifts. In the subsequent investigation, the presence of a single region was associated with the distribution of the deposits of the terrigenous Devonian deposit in the direction of the south-eastern uplift. Drilling of wells Nos. 31, 32, 33, 35 within the south-eastern uplift and in the intersecting between the south-eastern and north-western uplifts revealed the commercial oil-bearing capacity of strata DI and DII, with total effective oil-saturated capacities ranging from 7.1 m (well No. 35) to 17.8 m (well No. 31).
Originally well No. 33 was drilled southeast of well No. 31 (on the maps this position was marked as well No. 33_1). However, according to the drilling results, it revealed only a slight oil saturation in the terrigenous Devonian - the DI layer (according to the GIS - data, a 0.7 m sandy clayey layer with low oil saturation). In addition to the oil content of the terrigenous deposits of the Devonian in the well Nos. 31, 32, 33, 35, oil deposits in the Lower Carboniferous sediments were also revealed (layers B0 and B2).