A reliable velocity estimation in a complex deep-water environment using downward continued long offset multi-channel seismic (MCS) data
- Ghosal, Dibakar
- Singh, Satish C.
DOIAbstract
International audienceThe estimation of a reliable velocity-depth model from towed streamer marine seismic data recorded in deep water, especially with a complex seafloor environment, is challenging. The determination of interval velocities from the normal move-out (NMO) of the reflected seismic signals for shallow reflectors (<1 km below the seafloor) is compromised by the combination of a long wave path in the water column and the complex ray paths due to topography, leading to small move-out differences between reflectors. Furthermore, low sediment velocities and deep water produce refraction arrivals only at limited far offsets that contain information about deeper structures. Here, we present an innovative method where towed streamer s...
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