Abstract

Heat-flow density values at 78 sites in Tunisia and the Pelagian Sea are derived from oil exploration wells. Bottom-hole temperatures (BHT) are systematically corrected for mud circulation cooling effects either by a Horner technique when several temperature records are available at a given depth or by a statistical method based on the comparison of all BHT with test temperatures (DST) that are representative of the actual formation temperatures. Thermal conductivities are estimated from detailed studies of stratigraphic and geophysical logs. An inverse technique is used to estimate heat-flow density for each borehole, as well as interpolated temperatures at constant depths. Results are discussed with maps that include heat-flow density data in neighbouring areas (Algeria and the Strait of Sicily). The general trend corresponds remarkably to the recent structural evolution of the Tunisian margin with high values in the Pelagian Sea and decreasing values toward the stable platform.

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