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Simultaneous interpretation of gravity and magnetic data, taking into account all available information (geology, borehole, and nonconfidential seismic surveys), has been carried out with the help of potential-field transformation, modeling, and inversion software. Geophysical synthesis led to the delineation of a geologic map of the pre-Triassic basement of the Paris basin and to the delineation of the most important structural features of the Hercynian and Caledonian Ranges in France between outcropping Paleozoic massifs. Recent boreholes, drilled at the end of this synthesis, largely confirm the proposed interpretation. Thanks to simultaneous gravity and magnetic inversion, models of the Magnetic Anomaly of the Paris Basin can be proposed, and the origin of this anomaly can be related to a scheme of the structural evolution of the basin.

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