Distribution patterns of oil and gas accumulations in West Siberia

The current geological and geophysical exploration maturity and the structure of resource base have been presented for the West Siberian Basin. The patterns of oil and gas content distribution, both in areal extent and vertical, have been considered throughout the entire cover and its constituent oil-gas plays. Structural constructions for four major stratigraphic levels have been analyzed: the bottom of the Mesozoic–Cenozoic cover, the Jurassic and Lower Aptian top, and the bottom of Turonian deposits. The distribution patterns of oil and gas accumulations in each oil-gas play are controlled by a specific combination of parameters such as the distribution of reservoirs and seals, the presence of oil-and-gas source rocks, the level of organic matter maturity, facies and tectonic conditions, thermobaric and hydrogeochemical subsoil environments, etc.