RE: 3D seismic26 Nov 2019 20:02
3D or 4D can never be absolutely certain, analysis such as seismic inversion can assist in identifying hydro carbons versus water but there must always be risk until the well is drilled, lots of geological factors will only be known once drilled.
However Charlie-1 is an appraisal drill of an existing discovery and if you read up about seismic inversion you will understand that knowledge of local geology is very helpful in getting best results.
google or go to the oil page on wiki88 or go to the PMO half year presentation.
No one can take away all the risks inherent in oil exploration, Charlie-1 is probably near as good as it gets but nothing is ever certain in this life.