Ghost-free imaging combining synchronized multi-level source and variable-depth streamer

摘要

Variable-depth streamer acquisition is a key solution to provide broadband marine seismic data from 2,5 Hz to source ghost notch, thanks to an optimized receiver depth distribution. This receiver-side technique can be efficiently combined to a synchronized multi-level source, which allows canceling the source ghost notch and extending the recorded bandwidth to 200Hz. Moreover, thanks to accurate gun synchronization, the recorded data can be processed directly with the flow already developed for Variable-depth streamer, with some necessary changes to handle better the extra high frequencies. Such combined techniques have been successfully tested and applied in various 2D and 3D cases, in both shallow and deep water environments.