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Stress and Pore Pressure in Mudrocks Bounding Salt Systems

  • Maria A. Nikolinakou
  • Peter B. Flemings
  • Mahdi Heidari
  • Michael R. Hudec
Original Paper

Abstract

We simulate the evolution of stress and pore pressure in sediments bounding salt systems. Our evolutionary geomechanical models couple deformation with sedimentation and porous fluid flow. We find that high differential stresses develop near rising diapirs and below salt. Salt emplacement induces significant excess pressures that are comparable to the weight of the salt sheet. In addition, we show that the shear-induced component of the excess pressures is significant. We also find that low effective stresses result in low strength, which enables salt growth. We model salt as a solid viscoplastic and sediments as poro-elastoplastic materials, and calibrate the consolidation properties based on experimental testing on smectite-rich mudrocks typical of those in the Gulf of Mexico. Our approach can be applied to design stable well bores and provide insight into macroscale geological processes. Overall, we show that transient evolutionary models can provide estimates of stress and pore pressure in many geologic systems where large strains, pore fluids, and sedimentation interact. We close with a discussion of the need to better understand material behavior at geologic stress and timescales.

Keywords

Transient evolutionary model Modeling of complex geologic systems Pore-pressure prediction Full stress tensor Yield surface Stress-level dependency 

Notes

Acknowledgements

This study was funded by the UT GeoFluids consortium, the Applied Geodynamics Laboratory (AGL) consortium, and the Jackson School of Geosciences at The University of Texas at Austin. Paper edited by William Rader.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Maria A. Nikolinakou
    • 1
  • Peter B. Flemings
    • 2
  • Mahdi Heidari
    • 1
  • Michael R. Hudec
    • 1
  1. 1.Bureau of Economic Geology, Jackson School of GeosciencesThe University of Texas at AustinAustinUSA
  2. 2.Department of Geological Sciences and Institute for Geophysics, Jackson School of GeosciencesThe University of Texas at AustinAustinUSA

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