A recently discovered geohazard (i.e., after petroleum exploration advanced into the deeper waters off the continental shelf) often causes confusion when we try to describe it to those not familiar with this phenomenon. Shallow water flows (SWF) exist in deepwater. Then, why isn't SWF called “deepwater flows?” We have been familiar with shallow gas zones that have resulted in considerable losses via the occasional loss of a rig. They have been found in shallow water depths as well as in sands near the seafloor. Shallow water flows, on the other hand, generally occur from overpressured sands in deepwater (i.e., water...

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