Geophysical Journal | 2014 volume 36 5

Mesozoic-Cenozoic course of temperatures on the earth's surface and geothermal regime of the Jurassic oil source deposits (southern paleoclimatic zone of West Siberia)

© V.I. Isaev, A.A. Iskorkina, 2014

In a review the state of studies of the influence of the secular course of temperatures on the earth's surface on the thermal history of deep oil source deposits is characterized as a state of scientific research. The aim of research is generalization of the known data about Mesozoic- Cenozoic climate of southeastern part of West Siberia and the assessment of impact of the secular course of temperature of the earth's surface on the geothermal regime, the degree of realization of generation potential of parent Jurassic suites (bazhenov and togur suites). "Local" secular course of temperature of the Earth's surface for southern paleoclimatic zone of West Siberia is based on analytical summary of results of paleoclimatic reconstructions of Jurassic, Cretaceous, Paleogene, Neogene and Quaternary periods, published by various authors in the period of 1974-2011. The assessment of impact of paleoclimate on the thermal history of parent deposits was made on the basis of verification of results of paleotemperature modeling of sedimentary sections of deep wells, which opened the bazhenov and togur suites in Nyurolsky megadepression. It is established that reconstructions of thermal history of parent deposits excluding paleoclimate does not agree with the "bench mark" data about reflectance of vitrinite and installed oil-and-gas presence of section. Use for reconstruction of "local" secular course of temperature of the Earth's surface significantly clarifies the indicator of density for expected oil resources. "Local" secular course is recommended to consider in determining the hydrocarbon resources by volume-genetic method on land in Tomsk, Novosibirsk and Omsk regions.

Key words: secular course of temperatures, geothermal mode of the parent sediments, the density of primary oil, southeast of West Siberia.

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