GEOTHERMAL FIELD OF THE SEDIMENTARY COVER IN THE LENA-TUNGUSKA PETROLEUM PROVINCE

I. V. Litvinova, A. I. Surnin

The paper considers the evolution of geothermal model describing the sedimentary cover in the Lena-Tunguska petroleum province. Analysis and re-interpretation of available data as of 2014 characterise current geothermal field of the sedimentary cover in the Lena-Tunguska petroleum province with geothermal zonation. The paper includes the range of temperature variation in the sedimentary cover section within major petroleum plays: Cambrian, Vendian – Lower Cambrian, and Riphean-Vendian. Lateral variation of temperatures in different petroleum regions of the Lena-Tunguska province is considered. Territories with equilibrium (background) subsurface geothermal regime, geothermal regions of stable heating and stable cooling of the sedimentary cover are identified in the paper. The authors justify the major impact of conductive deep faults on formation of positive anomalies of the sedimentary cover geothermal field. Key factors in formation of abnormally cold areas in the north-east of the Nepa-Botuoba anteclise are determined.

Key words: Lena-Tunguska petroleum province, permafrost zone, geothermal field, geothermal gradient.

DOI 10.20403/2078-0575-2016-2-41-49

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