167 7. Integrated seismic study The deformations associated with tectonic plate movements have remained small for the past 150 million years, as in the rest of the Paris Basin (Guillocheau et al., 2000; Megnien, 1980). They are essentially limited to the Gondrecourt and Marne grabens, on the boundary of the sector studied (André et al., 2004; Rocher et al., 2004). The geological and geophysical studies have shown that the Cox layer is regular and virtually flat between these faults. Available data confirms that the region has very low seismicity. 7.2 Seismic designs and processing sequence Figure 7.3 is a map showing the location of the 2D seismic line 07EST10 crossing the area covered by the 3D survey (in purple) and the location of 2 lines extracted from the 3D block: the in-line 405 (IL405) and the cross-line 217 (XL 217). Although there are no boreholes located in the 3D seismic survey area, additional 2D lines have been recorded to calibrate the 3D seismic data by tying to 3 wells (pink circles) situated outside of the 3D area. Line 07EST10 is an example of the additional 2D seismic lines. Well EST433 is located on the line 07EST10 in the vicinity of the CMP 654 (Common Midpoint). Figure 7.3 Seismic line implementation and well locations. For the 3D seismic acquisition, the active spread (or template) is composed of 12 receiver lines with 120 stations on each line, with a cross-line roll along of
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