Modélisation thermique appliquée aux bassins sédimentaires et utilisant la géochimie organique : conception du logiciel "TherMO'S" pour la reconstitution de l'histoire thermique du bassin parisien à l'échelle séquentielle

Abstract : The reconstitution of the thermal history of a sedimentary basin is function of its burial history. The aim of this work is to correlate the information provided by the sequential stratigraphy with the ones provided by the kinetic transformation of the organic matter.The software TherMO'S has been programmed so as to estimate the palaeodepth, paleoporosity, thermal paleoconductivity, thermal paleoenergy and paleoTmax. A constant heat flux is proposed by the user for each borehole and adjusted regarding the Rock Eval pyrolysis Tmax data. TherMO'S has been tested for for 20 of the boreholes of an E-W cross section running from Rambouillet to St Loup in the Paris basin. This study has been realised at the stratigraphic sequential scale. We have obtained a thermal database. The simulations have permitted to point out a lateral decreasing of the heat flux from Rambouillet to Trou Aux Loups. In the mean time, the thermal gradient decrease according to time for each borehole. The thermal results underline the thermal subsidence consequences on the thermal properties evolution associated to each horizon burial history. The simulation permitted to distinguish 3 thermal events during the Pliensbachien, Dogger-Malm and the ending lower cretaceous - upper superior cretaceous.
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Lübna Amir. Modélisation thermique appliquée aux bassins sédimentaires et utilisant la géochimie organique : conception du logiciel "TherMO'S" pour la reconstitution de l'histoire thermique du bassin parisien à l'échelle séquentielle. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10280⟩. ⟨tel-01754433⟩

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