Principles and Methods to Construct Detailed Models of Composite Modern and Paleotemperature Fields

Abstract

The western Siberia's geotemperature field belongs to the category of composite fields, which is manifested by its significant changeability due to abrupt climatic changes in the late Quaternary. Deviation of geotemperature gradients reaches ±50%. The mathematical model of the geotemperature field has been constructed and on its base methods were developed for determination of deep heat flow and prediction of modern and paleotemperatures. The heat flow determinations were fulfilled for more than 300 deep boreholes. The parameter value varies from 44 to 80 mWm", averaging 56 mWm". Maps of deep heat flow distribution, maps of modern temperatures and maximum paleotemperatures at the base of western Siberia's sedimentary mantle have been constructed. O campo de geo temperatura da Sibéria Ocidental pertence à categoria de campos compostos, que é manifestado por sua mudança significativa devido a variações climáticas no Quaternário Superior. Os desvios nos gradientes geotérmicos são da ordem de 50%. Foi construído o modelo matemático do campo geotérmico e com base neste, foram desenvolvidos 300 poços profundos. O valor deste parâmetro varia de 44 a 80 mWm-2. Foram construídos mapas da distribuição de fluxo de calor, de temperaturas atuais e de máximas paleotemperaturas na base do monte sedimentar da Sibéria Ocidental.