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Ground penetrating radar application in a shallow marine Oxfordian limestone sequence located on the eastern flank of the Paris Basin, NE France
Authors:Guy Dagallier  Ari I Laitinen  Fabrice Malartre  Ignace P A M Van Campenhout  Paul C H Veeken  
Institution:

a Ecole Nationale Supérieure de Géologie, UMR 7566 CNRS, BP 40, 54501 Vandoeuvre-lès-Nancy, France

b Geofox bv, Scholtendijk 3, Postbus 310, 7570 AH Oldenzaal, Netherlands

c Landmark Graphics, Meridian Commercial Tower, 24-D Smolnaya Street, 125445 Moscow, Russia

d Compagnie Générale de Géophysique, 1 Rue Léon Migaux, 91341 Massy, France

Abstract:A Ground Penetrating Radar (GPR) survey has been carried out in Upper Jurassic limestones located on the eastern flank of the Paris Basin (NE France). The potential of the investigation method is assessed for delineating geologically meaningful stratifications in the shallow subsurface. The fundamentals of the GPR technique are described. Penetration depth and vertical resolution depends on the soil conditions, the characteristics of input signal and the configuration of the transmitter–receiver assembly. In the studied carbonates the penetration level is rather good and the electromagnetic signal reaches up to 1000 nanoseconds maximum (i.e. approximately 55 m). Several depositional units are outlined on the GPR profiles. Six different lithological units are recognised with distinct GPR reflection characteristics. The profiles illustrate the internal 3D organisation of the carbonate platform and its geometry. They provide detailed insight into the nature of an Oxfordian reefal build-up. The high-resolution subsurface model is directly calibrated with geological field observations and it results in a predictive 3D depositional working model. The GPR method is a non-destructive remote sensing technique that is cost effective. The method is considered complementary to other conventional high-resolution reservoir characterisation studies. It represents a powerful investigation tool in earth science studies concerning the imaging of the structure of the shallow subsurface.
Keywords:georadar  electromagnetic  dielectric constant  lithological analysis  carbonate rocks  reservoir properties
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