Research was conducted on the deep structure of sedimentary basins located in the continent – ocean contact zones characterized by increased seismicity, volcano eruptions and other disastrous phenomena. Sedimentary basin formation is associated with processes going on in the upper mantle and specifically in the asthenosphere. From the asthenosphere to the crust, diapirs branch off that are channels by which deep fluids bearing earth-degassing products penetrate into sedimentary basins, being an additional source of hydrocarbons.