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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy
(S) - IASPEI - International Association of Seismology and Physics of the Earth's
Interior
JSS017 Poster presentation 2384
The evaluation of the heat flow in the area of the Uralian Superdeep well
CГ-4
Prof. Aleksander Lipaev
development of oil and gas fields almetyevsk state oil institute IASPEI
Sergey Lipaev
In order to improve the accuracy of the heat flow value (q) the authors have carried out the
measurements of the basalt samples thermal conductivity from the well CГ-4 taken from the depths of
5010-5090 metres. The results of the investigations show that in the conditions of temperature
increasing from 20 C up to 80 C with the constant pressure (p=0,1 MPa) all the investigated samples
show the average 9-10 % decreasing of thermal conductivity (λ). At the same time in the conditions of
the temperature changing from 20 C and pressure 0,1 MPa to the thermodynamic conditions of the
basalt formation (t=80 C, P=150 MPa) the average 7-8 % λ increasing is observed which is the result of
the temperature and pressure effects. The noted effect of the thermal conductivity increasing with the
increasing of the reservoir depth is mostly characteristic for the Uralian area where the relatively low
values of the depth temperature are observed. In this case the influence of the high formation pressure
on the thermal conductivity may reduce the effect of the thermal conductivity decreasing on the
temperature increasing and even surpass it. Three variants of the heat flow density evaluation have
been carried out: 1) in the case when the thermal conductivity value in considered under the
temperature of 20 C and atmospheric pressure, the heat flow for the depths range from 5010 to 5090
metres makes up 40,1 mW/m2. 2) in the case when the only factor that is the temperature (80 C)
influences the rock the nominal (calculated) value of the heat flow makes up 35,6 mW/m2; 3) the full
consideration of the temperature and pressure effects on the rock thermal conductivity leads to the
value of q=42,9 mW/m2. The authors believe that the most true (reliable) q value is the last one, while
measurements of rock thermal conductivity under the atmospheric conditions lead to the certain
reducing of the heat flow value. And though it seems paradoxical, the consideration of only one of the
two opposite factors of the influence on the rock λ, that is of the temperature factor, may lead to even
more distorted result obtained. The paper, therefore , suggests the necessity of a methodology for
measuring the rock thermal conductivity when the samples are effected by both parameters
temperature and pressure.
Keywords: density, conductivity, measurements