Thermal conductivity of the sedimentary-cover rocks in the Arctic West Siberia

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Авторы: Duchkov A.D.   (ИНГГ СО РАН)   Sokolova L.S.   (ИНГГ СО РАН)   Ayunov D.E.   (ИНГГ СО РАН)   Zlobina O.N.   (ИНГГ СО РАН)  
дата публикации: 2013
The thermal conductivity of rocks used previously to estimate heat flow in high-latitude Siberia was assumed to be ? = 1.8-2.0 W/(m{dot operator}K), according to published evidence, but was almost never measured specially. We measured the thermal conductivity of core samples from boreholes drilled in the northeastern West Siberian Plate and in the Yenisei-Khatanga basin in the 1990s, using two advanced instruments: a comparator and a scanner of thermal conductivity. Altogether there were 305 samples of air-dry sediments (?d) from the 1100-4200 m interval of 23 holes, out of which 77 samples were then moistened (?w). The average thermal conductivities of rocks in dry and wet conditions were found to be ?d = 1.9 + 0.2 and ?w = 2.6 + 0.1 W/(m{dot operator}K), respectively. Thus, the true thermal conductivity of sediments, which are saturated with water in this northern area, must be about 20-30% higher than that assumed in the previous heat flow determinations, and the latter are thus underestimated correspondingly. The updates to the thermal conductivity values imply major revision to the existing ideas of the thermal regime in the Siberian high latitudes. Such a serious revision of geothermal data will obviously require a large amount of additional experimental work
первоисточник: Russian Geology and Geophysics
том: 12
страницы: 1522-1528
внешние ссылки:
WoS   WoS (цитирование)






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