As industry moves toward exploring and producing in deeper water areas, the impact of velocity variations in the water layer will become more critical. Acquisition crews are very much aware of this phenomenon. For example it is known that large salinity variations caused by salt seabed outcrop or fresh river water dumping can introduce velocity contrasts strong enough to create a reflection in the water column (such as the 3 s brine reflection in the Orca Basin, Gulf of Mexico) or can affect the balance of towed streamers. On the other hand, this problem requires more careful examination than is...

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