The very strong flow rate is a direct result of a formation under extreme pressure being exposed to a differential in pressure. The greatest production rates will be seen in the days following initial completion, regardless of drive mechanism. Just as many of the prolific reservoirs in North America see high initial production rates (and declines!!) so should PTA's new drills. A guy would need to see offsetting production plots of wells in the area and same formation to conclude what the drive mechanism is, whether water drive, solution gas drive, gas cap drive, rock expansion drive or a combination of the possible drives. A comprehensive log analysis would also be required containing resistivety, neutron density, SP, and gama and probably corrolate to core or cutting to see in there is oil over water here. To early to tell and not enough data available to say. This is something only the technical muscle of the company has, too bad Columbia isn't on the same public data system as Alberta (Accumap) or I could probably tell you.
If there is a very strong water drive the GOR will stay consistent and water cuts remain very stable until the ocean comes in, almost over night. They are not perforating the entire 'pay' interval which leads me to believe they"re staying always from something. Whether it is the water or gas cap time will tell, but that could take months, or years! Or never!