the Pyrenees
The south-central Pyrenees provide a diversity of outcrop analogues for hydrocarbon reservoirs. Most types of carbonate and clastic depositional environments in a ‘continent to basin’ transition can be investigated within a short distance of each other.
At both outcrop and seismic scale, the exceptionally well-preserved relationship between deformational structures and sedimentation allows detailed studies of the interactions between tectonics and basin evolution. In addition, fault and fracture type, and, scale and distribution can be studied in the context of different lithological and structural settings.
Geological Introduction
The Pyrenees formed as a fold-thrust belt in Late Cretaceous to early Miocene times at the collisional boundary between the Iberian and European plates. Their geometry is fanlike with a central Hercynian antiformal stack flanked by thrust units of Mesozoic-Paleogene rocks detached above Triassic evaporites.
During the Cretaceous, a south-central Pyrenean rift basin recorded the deposition of rudist- and coral-bearing carbonate platforms. From Late Cretaceous to Eocene, a 7,000 m thick delta system filled a foreland deepening westward to the Atlantic ocean. 
The sedimentary facies evolve from fluvial sand belts to sheet turbidite sands, through deltaic/shoreface bars and slope channels, with minor intercalations of transgressive carbonates. Coarse alluvial fans were deposited from the latest Eocene to early Miocene.