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Oil deposits in Bashkirian strata regionally oil-saturated, within the Volga-Ural oil and gas bearing province. They contain up to 30% of hydrocarbon reserves. Bashkirian strata are represented by carbonate complexes of various lithological type. Only packstone and grainstone have properties of oil-saturated reservoirs, mudstone and wackestone are dense rocks. A characteristic feature of the Bashkirian carbonates is the wide presence of stylolites filled by greenish-gray clay minerals. It is known, that hydrocarbo...