Naturally occurring underpressure – a global review

Several mechanisms have been suggested as drivers of naturally occurring underpressure. However, the phenomenon is largely underrepresented in literature. Previous studies focused on individual cases North America, where challenges due to topography and defining hydrostatic gradients exist. More recent publications from underpressured basins emerged other parts world, settings are arguably more favourable studying phenomenon. Based a total 29 locations, it apparent that magnitudes depths underpressure similar throughout world. Pressures up 60 bar blow common sedimentary China, Russia, Europe typically occur at shallow (< 2500 m). All occurrences areas geologically recently uplifted predominantly confined low permeability rocks. Although rarely tested, appears mudstone intervals susceptible developing Given shallowness, permeability, uplift cases, seems short-lived Thematic collection: This article part Geopressure collection available at: https://www.lyellcollection.org/cc/geopressure