Assessing the implications of tectonic compaction on pore pressure using a coupled geomechanical approach

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• 作者：Joshua Obradors-Prats^a ; Mohamed Rouainia^a ; ^{mohamed.rouainia@newcastle.ac.uk} ; Andrew C. Aplin^b ; Anthony J.L. Crook^c
• 关键词：Tectonic compaction ; Overpressure ; Equivalent depth method (EDM) ; Coupled geomechanics ; Critical state ; Finite element
• 刊名：Marine and Petroleum Geology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：79
• 期：Complete
• 页码：31-43
• 全文大小：2473 K
• 卷排序：79

文摘

A fully-coupled geomechanical approach to capture the true compaction occurring in an evolving 3D stress regime is adopted. 2D models of clay columns accounting for sedimentation and tectonic activity are developed. A high deviatoric stress is generated in compressional tectonic basins resulting in a substantial decrease in porosity. The more the deviation from the uniaxial burial trend, the more inaccurate the EDM overpressure predictions.