On The Importance Of Measuring Thermal Conductivities For Heat Flow Density Estimates- An Example From The Jeanne D'Arc Basin, Offshore Eastern Canada

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Journal Article: On The Importance Of Measuring Thermal Conductivities For Heat Flow Density Estimates- An Example From The Jeanne D'Arc Basin, Offshore Eastern Canada

Abstract
Temperature data from petroleum exploration wells can be used to study the thermal regimes of sedimentary basins. In this, it is common to consider many wells and to multiply the average geothermal gradient measured in each well by the effective thermal conductivity of the rocks across the interval over which the gradient is determined to obtain a heat flow density estimate for the location of each well. It is often not possible to measure the thermal conductivities of the rocks present in the basin, and the usual approach is to assign thermal conductivity values based on published values to those rocks. It is shown that, at least in Jeanne d'Arc Basin, to use assumed thermal conductivity values to calculate heat flow densities at the locations of the 35 wells considered is misleading and results in heat flow density estimates that can be one-half those found using thermal conductivities based on values obtained from measurements on rocks from some of the wells in the basin. These differences in heat flow densities can lead to differences in the extrapolated temperatures using the two sets of thermal conductivities as high as 264°C at 20 km depth. Higher temperatures are obtained when the measured thermal conductivity data set is used.

Authors 
A. Correia and F. W. Jones








Published Journal 
Tectonophysics, 1996





DOI 
10.1016/0040-1951(95)00121-2


 

Citation

A. Correia,F. W. Jones. 1996. On The Importance Of Measuring Thermal Conductivities For Heat Flow Density Estimates- An Example From The Jeanne D'Arc Basin, Offshore Eastern Canada. Tectonophysics. (!) .