Abstract

Evaluation of heat flow in 230 oil wells, using temperature measurements (bottom-hole temperature and temperature of fluids in drill stem test) and various rock-porosity data, reveals a high heat-flow average (82 ± 19 mW∙m−2) associated with the Algerian Sahara basins.The isopleth map exhibits significant regional variations overprinted by short-wavelength anomalies that, in general, are related to the local geological structure.On a regional scale, we observe an essentially north–south zonation that is not directly related to the major structural units, except for the northern alpine domain. The southern area, at the border of the Hoggar Precambrian basement, is characterized by very high heat-flow values (90–130 mW∙m−2). The anomalies define a major axis, generally east–west, which seems to affect the northern part of the African plate, from the Canaries to Libya. Locally, some relationships with extensional Miocene–Pliocene–Quaternary volcanism suggest an association with recent mantle thermal events. [Journal Translation]

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