Geological Aspects and Oil-and-Gas Content of Board Pricaspian Syneclise

Abstract Pogodaevo-Ostaf'evsky depression is situated in northern board of Pricaspian syneclise. It is unrequited late devonian – tournaisian depression, which succeed to ancient Perelyubskiy depression of basement. This depression is filled up by strong (400 m) terrigenous deposits vezenian age (kos'vinsko-radaevskie deposits). On territory of Pogodaevo-Ostaf'evsky depression oil-and-gas fields not yet discovered, but on nearby territory are finded oil inflows from similar sediments. Prospects of oil-and-gas content of depression are connected with three complexes: late devonian – tournaisian, kos'vinsko-radaevskij, and probably, bobrikovian. Opening of oil-and-gas fields in an onboard zone of depression is connected with reefs bodies late devonian – tournaisian age. Also prospects of territory should be connected with zones of beds thinning on depression board's vezenian thicknesses of compensation. These deposits can be perspective and in an internal zone of depression where their thickness is increased. Conceivably, bobrikovskie deposits have oil-and-gas content (by analogy with Muhanovo - Erohovskij depression where bobrikovskie sandy layers have oil-and-gas content) are presented by covering structures above barrier reefes. At present by seismic data have been evolved perspective objects on Zapadno – Ovchinnikovskoj, Ovchinnikovskoj, Lebedevskoj, Malozajkinskoj, Novotrudovoj, Severno – Talovoj, Talovoj, Yuzhno – Talovoj areas. These are the bodies of the small size located in a zone of reef benches. Reseched territory – northern board of Pricaspian syneclise, zone of a joint it's with Volgo-Ural'skaya anteclise. Late devonian - tournaisian reef bench, traced in the given territory, on a significant extent it is regressively built on by the vizenian-bashkirian barrier, and they create uniform sedimentary bench. This barrier reef forms boards of Pogodaevo-Ostafevskij not compensated paleodepression, inheriting Perelubskij sag of the base.