165 7. Integrated seismic study embedded by two thick carbonated units: Dogger and Oxfordian. The Dogger (Bathonian, Bajocian) corresponds to the development of carbonate platforms in the Paris Basin (Gaumet, 1997; Purser, 1980, Brigaud, 2014). The clayey formation is separated from the Dogger limestone by a regional paleo-erosion surface. The Bathonian limestone formation is the first aquifer encountered in the Jurassic succession. Above the Cox, an Oxfordian (Middle and Late) platform was found, developed with reefs and bioclastic facies. The Oxfordian limestone formation is a second Jurassic aquifer. The two aquifers are studied in this work. In the area investigated by seismic surveying, the outcropping formations are Kimmeridgian marls and Kimmeridgian and Tithonian limestone with a thin deposit of Cretaceous. Figure 7.2 gives the geological description of the Jurassic and Triassic series at well EST433 and the location of the interpreted seismic horizons (Landrein et al., 2014; Mari and Yven, 2014). Figure 7.1 Simplified geological map of the Paris Basin showing the location of the Meuse/Haute-Marne site and Andra’s underground research laboratory (URL). Scale
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