High Resolution Vibroseis in the Paris Basin

To image properly the main oil reservoirs in the Paris Basin, a thin carbonate layer<br>(25 m) that lies at 2000 m below the surface, the bandwidth of the signal must be<br>widened beyond 3 octaves (10-80+Hz). During a group shoot acquisition project, the<br>possibilities offered by vibrator control electronics to enlarge the bandwidth and to<br>improve vertical resolution were tested for VSP, and surface 2D & 3D acquisitions<br>(Mougenot, 1999).