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Thermal maturation for the top and base of the Jurassic in the West Siberian megabasin was modeled on the basis of the vitrinite reflectance (Rvt0) data using mathematical modeling and computer simulations. The values of thermal maturation are found to vary within substages PC3–MC32 for the top (or being equivalent to PC3-MC12 on the periphery and southern part of the basin, or to MC2-MC32 in the north) and PC3-AC3 for the base of the Jurassic (or being equivalent to PC3-MC2 on the periphery and southern part of the basin or MC31-AC3 in the north). Thermal maturity levels of the Jurassic in West Siberia are controlled by depths of burial and peak temperatures which the source rocks were subjected to during this period. The situation is further complicated by high heat flows superimposed on the regional background, which are observed in deep fault zones and in the proximity of numerous igneous bodies.

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aThe united institute of geology, geophysics and mineralogy SB RAS; bChita institute of natural resources SB RAS ABSTRACT The industrial and inhabited complexes of Novosibirsk Academgorodok are built in a natural environment in view of a relief and wind rose and form geochemical steady natural-anthropogenic ecosystem. In this territory, despite of long (more than 40 years) anthropogenic influence, is kept rather high quality of an environment. These conclusions are based on results of ecogeochemical researches of microelemental composition of soil cover (87 samples) on territory of Novosibirsk Academgorodok and on the basis of the computer analysis of the received data with use of statistical methods and spatial modeling. The sites with typical for the given territory and increased values of the geochemical characteristics are allocated.Is shown, that typical ecogeochemical conditions of Academgorodok is closer to natural landscapes, instead of urban. The exception is the local anomalies connected to the increased contents of zinc and lead, dated to highways and parking places.

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