Известия Томского политехнического университета: Инжиниринг георесурсов (Jul 2021)
HEAT FLOW AND OIL AND GAS PRESENCE OF THE TOMSK REGION NORTH-EASTERN PART
Abstract
The relevance of the study of the north-eastern part of the Tomsk region is determined by the need to search for new sources of replenishment of the resource base, defined by the strategy for oil industry development in the Russian Federation until 2035. The main aim of the research is to determine the heat flow density from the bottom of the sedimentary section by solving the inverse problem of geothermics. It includes the anomalous zones correlation of the obtained parameter with the established oil and gas content and the prospects determination of the north-eastern lands of the Tomsk region for the Lower Jurassic and pre-Jurassic deposits. The objects of the research are the north-eastern lands of the Tomsk region belonging to the territory of widespread Hettangian-Lower Toarcian. There are potential oil-source Togur deposits having certain similarity in geological structure with oil-producing regions. The temperatures measured in 38 exploration and parametric representative wells were used to determine the heat flow density. Research methods include the collection and analysis of geological and geophysical data on deep wells drilled in the research area, 1D paleotemperature modeling combined with paleotectonic reconstructions using a domestic software product. The result. The authors have built a map with a cross-section of isolines of 2,5 mW/m2 based on the calculated values of the heat flow in the wells by the interpolation method. The analysis of the performed constructions shows that the thermal field on the top of the basement in the north-eastern part of the Tomsk region is heterogeneous. Its values vary from 33 to 69 mW/m2 . The zone of increased values of the heat flow density extends from north-west to south-east, crossing tectonic structures. A decrease in the intensity of the geothermal field is observed in the north-eastern and eastern sections. The increased values of the heat flow, in general, correlate with the established oil and gas content in the study area. Within the southern part of the Karamka Mesotrough, high prospects are expected in the Lower Jurassic and Pre-Jurassic complexes. High prospects for oil and gas content can be noted in the area of the Yuzhno-Pyzhinskaya 1 parametric well and lands located in the East Paiduga Megadepression, where the thickness of the Lower Jurassic deposits and the magnitude of the heat flow are increased. Conclusions. The authors obtained new data on the heat flow density in the Tomsk region north-eastern part. The study area is promising for further prospecting and exploration work with the aim of discovering deposits in the Lower Jurassic and pre-Jurassic objects.
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