Overpressure prediction in shales
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Accurate overpressure detection and prediction is essential to the scientific understanding of the history and safe engineering exploitation of a sedimentary basin. We predict the velocity of shales using the Clay-Plus-Silt (CPS) model from logging measured parameters, the modeled velocity is then used as normal velocity trend to detect and predict overpressure using Eaton equation. The results show that the CPS model predicts accurate velocity in normal-pressure shales, and the modeled shale velocity can be used to detect and predict overpressure more accurately than the established normal velocity trend in overpressured wells.
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Pervukhina, Marina; Piane, C.; Dewhurst, D.; Clennell, M.; Nordgård Bolås, H. (2013)Pore pressure in shaly formations is difficult to measure due to their extremely low permeability. For this reason, indirect methods of pore pressure estimation in shales are crucially important. Overpressured zones in ...
Han, T.; Pervukhina, Marina; Clennell, M.; Dewhurst, D. (2017)© 2017 Society of Exploration Geophysicists. All rights reserved.Accurate pore-pressure interpretation and prediction play important roles in understanding the sedimentary history of a basin and in reducing drilling hazards ...
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