I map the distribution of subsurface pressures in thick interconnected sand bodies that are present across the Auger Basin, Gulf of Mexico. I show that overpressures are nearly constant across as many as 12 miles (19km) in the basin. Using 3D seismic and pressure data I show that the extrapolation of pressures along the hydrostat results in accurate prediction of reservoir pressures over basin-scale distances. Furthermore, at the sand crest, pressures are high enough to hydraulically fracture the overlying shales and therefore dynamically constrain the sand pressures by way of a leak point overlain by mud volcanoes. The expelled material from multiple mud volcanoes in the Auger Basin covers an area over 25km² and may be a useful analogy for present day natural disasters.
