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Intrusive Magmatism, Influence on The Formation of Generation-Accumulation Hydrocarbon Systems of The Baikit Anteclise (Eastern Siberia)
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Tyumen 2021, Mar 2021, Volume 2021, p.1 - 5
Abstract
The study of the evolution of the sedimentary-rock basin of the Baikit anteclise was carried out by the method of numerical basin modeling.It is taken into account that the temperature effect of intrusion is expressed in an instantaneous increase in temperatures in the zones affected by the intrusive process and the further spread of temperatures into the surrounding sedimentary layers.The results of modeling the process of organic matter maturation in the parent rocks indicate that by the time of 260 Ma, the OM of the parent rocks begins to transform. And by the time of peak values of heat fluxes (250 million years ago), all Riphean and most Vendian oil and gas fields had fully developed their generation potential. Calculation of the reflectivity of vitrinite and the temperature effect of intrusion made it possible to determine the patterns of distribution of oil and gas generation zones to each of the regional complexes. As a result of intrusion intrusion, the areas of liquid hydrocarbon storage have significantly decreased for both complexes under consideration. On the basis of these ideas about the safety of hydrocarbons in different thermobaric conditions, the zones of gas accumulation and the zones of oil and gas accumulation were divided.The thermal effect of the Siberian plume led to the complete "depletion" of the generation potential of all Riphean and most of the Vendian source rocks. The main oilbearing prospects are associated with the southern territories, while in the north only gaseous hydrocarbons are predicted.