Influence of Intrusive Processes on the Formation of Hydrocarbon Saturation in Subsurface Reservoirs: An Example from the Siberian Platform

The abstract points out relationships between intrusive processes and hydrocarbon saturation in the Siberian platform. Located around the periphery of the Tunguska synclinorium (especially to its south and south-east) are large hydrocarbon pools: Kuyumbinskoe, Paiginskoe, Chonskoe and many others. These deposits are confined to the Riphean, Vendian and lower Paleozoic strata making up the lower structural tiers of the platform cover. Early Triassic basaltic rocks interstratified with this sequence comprise a mix of sills, dikes and stocks. Together, these basaltic rocks make up a large igneous province (LIP). These geological bodies are paragenetically associated with manifestations of trap volcanism. Using the southwestern part of the Siberian platform as an example, the influence of early Triassic magmatism on oil and gas reservoirs has been modelled in 3D to help us better understand the petroleum system in this region and the way the hydrocarbons were generated and accumulated. Based on our modelling, we calculated the transformation ratio of organic matter in source rocks as well as the history of hydrocarbon generation.