SW Siberia's Jurassic, Bazhenov may contain much larger oil reserves

The name "Bolshoi Salym" is applied to a group of areas and oil fields located in Shirotnoye Priob'e between the Ob' and Irtysh Rivers. They include Salym, North Salym, West Salym, Prirazlomnoye, Verkhne-Shapshinskoye, Sredne-Shapshinskoye, etc. The Mesozoic-Cenozoic sedimentary rocks overlying Pre-Jurassic with angular and nondepositional unconformity play an important role in the geology of these areas and fields.The basement (seismic horizon A) is composed of Middle Devonian quartz-porphyry, and the weathered basement is composed of porphyry, gravelstone, and tuffaceous mudstone. In some locations between basement and Jurassic there is an intermediate sequence composed of Permo...

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