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Webinar: Effects of plastic deformation on poroelastic pore pressure coefficients

This presentation contains extracts from our work on the relationship between the undrained pore pressure response to stress changes and plastification of a transversely isotropic (TI) medium, such as shales.


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Presenter: Marcin Duda, NTNU

We present results of laboratory experiments indicating strong correlation between the values of the poroelastic parameters and the ratio between elastic and total axial strains, a relationship that can prove to be very useful in modelling of pore pressure response in shales in the direct proximity of faults.

Finally, we show a case of transition of unloading-induced pore pressure change from negative to positive values in the constant mean stress conditions, as well as gradual deviation of shale behavior from the one expected for a medium with purely elastic TI symmetry.

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