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<p>Accurate characterization of subsurface thermal regimes is critical for geothermal resource assessment and basin thermal history reconstruction. In Tunisia, existing borehole temperature corrections were often adapted from methods calibrated for non-local geological settings, limiting their applicability to the Tunisian sedimentary basins. For that, a review of novel correction framework tailored to the Gulf of Gabes and Gulf of Hammamet regions in Eastern Tunisia is proposed. It integrates 2690 temperature measurements from 240 boreholes—including Bottom Hole Temperatures (BHT), Drill Stem Tests (DST), and Modular Formation Dynamics Tester (MDT) data. Multiple correction techniques were evaluated and the cross-plot method of BHT versus DST emerged as the most robust, enabling derivation of two domain-specific correction equations that account for the distinct structural and thermal evolution of each basin and closely approximate formation temperatures. In addition, a new approach is used to adjust thermal conductivity based on porosity measurements, resulting in the conception of the first thermal conductivity map for Eastern Tunisia. The combined corrections significantly refine the spatial distribution of heat flow, yielding average values of 68&#xa0;mW/m<sup>2</sup> in the northern Sahel–Gulf of Hammamet block and 71&#xa0;mW/m<sup>2</sup> in the southern Gulf of Gabes. The corrected heat flow map of Eastern Tunisia demonstrates strong correlation with regional tectonic structures and geodynamic processes, reflecting crustal thinning and mantle dynamics influencing the thermal regime. This updated thermal model provides an enhanced framework for interpreting geothermal gradients and heat flow patterns, in Eastern Tunisia, serving as a valuable tool for both geothermal and petroleum explorations.</p>

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Heat flow and conductivity mapping from the Gulf of Gabes to the Gulf of Hammamet, Eastern Tunisia (Southern Mediterranean Sea): a review

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Insaf Mraidi,
  • Amina Mabrouk El Asmi,
  • Moncef Saidi,
  • Ahmed Skanji,
  • Khaled El Asmi

摘要

Accurate characterization of subsurface thermal regimes is critical for geothermal resource assessment and basin thermal history reconstruction. In Tunisia, existing borehole temperature corrections were often adapted from methods calibrated for non-local geological settings, limiting their applicability to the Tunisian sedimentary basins. For that, a review of novel correction framework tailored to the Gulf of Gabes and Gulf of Hammamet regions in Eastern Tunisia is proposed. It integrates 2690 temperature measurements from 240 boreholes—including Bottom Hole Temperatures (BHT), Drill Stem Tests (DST), and Modular Formation Dynamics Tester (MDT) data. Multiple correction techniques were evaluated and the cross-plot method of BHT versus DST emerged as the most robust, enabling derivation of two domain-specific correction equations that account for the distinct structural and thermal evolution of each basin and closely approximate formation temperatures. In addition, a new approach is used to adjust thermal conductivity based on porosity measurements, resulting in the conception of the first thermal conductivity map for Eastern Tunisia. The combined corrections significantly refine the spatial distribution of heat flow, yielding average values of 68 mW/m2 in the northern Sahel–Gulf of Hammamet block and 71 mW/m2 in the southern Gulf of Gabes. The corrected heat flow map of Eastern Tunisia demonstrates strong correlation with regional tectonic structures and geodynamic processes, reflecting crustal thinning and mantle dynamics influencing the thermal regime. This updated thermal model provides an enhanced framework for interpreting geothermal gradients and heat flow patterns, in Eastern Tunisia, serving as a valuable tool for both geothermal and petroleum explorations.