The depositional environment represent modern analogue to buried sand bodies at the Norwegian continental margin and a field study can therefore give participants a better understanding of the reservoir potential and architecture of hydrocarbon bearing sand bodies.
The field trip was held by Hugues Fenies from CVA Engineering. Participants were employees from various Norwegian and UK oil companies as well as from NPD and Petoro. Bayerngas sent one participant.
The first day we went to the Gironde estuary, which is highly influenced by tidal water. The Gironde estuary is a partly enclosed coastal body of brackish water with the rivers Dordogne and Garonne flowing into it. At low stand we went by boat to a sandy tidal bar in the Gironde funnel (middle part of the estuary). The timing of the excursion had to be carefully planned in between the strong tidal currents, which are potentially dangerous. At the tidal bar we got practical experience in digging out sediment sections, analyzing them visually and finally logging their internal geometry.
The next day we visited the Arcachon lagoon. This lagoon is also highly influenced by tidal water with strong currents. In the inner lagoon we studied meandering tidal channel deposits. In the outer part of the lagoon in the tidal inlet channel we inspected the massive well sorted sand deposits, which is a modern analog to "very nice" reservoir sandstone.
The last day we studied the Oceanic beach deposits close to the estuary mouth of the Gironde estuary.
Apart from being a fascinating geological region, the participants were also offered a taste of the rich cuisine and cultural landscape of Bordeaux