Abstract
Overpressure situation can be created in both clastic and non-clastic reservoirs when at some depth the formation pressure exceeds what is expected for a hydrostatic (normal/lithostatic) pressure scenario. Likewise an underpressure situation has also been reported from reservoirs after sufficient hydrocarbons have been extracted. Over- and underpressure can develop by both tectonic (e.g., horizontal or vertical stress) and atectonic processes (e.g., mineral phase change, kerogen maturation). Presence or withdrawal of water (saline and freshwater) and hydrocarbon can produce over- and underpressure. Fracture pressure and its gradient are important in planning well-drilling programmes. Pore pressure estimation has become an active field of research in the present day oil industry and several methods exist for such estimation.
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Dasgupta, T., Mukherjee, S. (2020). Pore Pressure Determination Methods. In: Sediment Compaction and Applications in Petroleum Geoscience. Advances in Oil and Gas Exploration & Production. Springer, Cham. https://doi.org/10.1007/978-3-030-13442-6_3
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