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- W4297348049 abstract "ABSTRACT: The connection between undrained pore pressure response to stress in shales and fault reactivation, drilling problems and microseismicity observed at significant distances from hydrocarbon reservoirs and injection zones has not been thoroughly studied and is usually disregarded in geomechanical modelling workflows. In our study, we examine to what extent the inclusion of the pore pressure response affects the amplitude of total stress changes expected to cause shear failure in several overburden and outcrop shales. We combine poroelastic pore pressure coefficients and Mohr-Coulomb failure envelope parameters estimated through triaxial laboratory experiments to model the total stress increases at failure for a wide range of loading scenarios and medium orientations. We consider both isotropic and anisotropic pore pressure parameters - we explore the differences in modelling outcomes the two sets of parameters yield, as well as the impact of the individual parameters on the expected stresses at failure. We observed that shear failure in shales is expected at significantly lower stresses changes and is plausible in a much wider range of loading paths once the undrained pressure response in considered, and therefore we postulate that it should be taken into account during injection or production operations safety assessment. 1. INTRODUCTION Injection into or production from a subsurface reservoir have been documented to lead to fault activation, microseismic activity, and borehole stability issues in the reservoir and its surroundings (e.g., Pine et al., 1983; Raleigh et al., 1976; Zoback & Harjes, 1997). In some cases, these undesired phenomena occurred in the over-and underburden at significant distances from the reservoir subjected to pore pressure change (e.g., Odonne et al., 1999; Rutqvist et al., 2008; Segall, 1989). This has triggered an ongoing discussion of the causes of these events. Until now, it was primarily associated with pore fluid migration through fractures and fault planes throughout low permeable under- and over-burden, as well as with stress transfer (e.g., Vasco et al., 2018; Verdon et al., 2011; Williams-Stroud et al., 2020; Zhou et al., 2008) caused by injection- or production-induced pore pressure changes in the reservoir (e.g., Geertsma, 1973; Morita et al., 1989; Rudnicki, 1999)." @default.
- W4297348049 created "2022-09-28" @default.
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- W4297348049 date "2022-06-26" @default.
- W4297348049 modified "2023-09-26" @default.
- W4297348049 title "Impact of Undrained Pore Pressure Response on Expected Failure Stress in Anisotropic Shales" @default.
- W4297348049 doi "https://doi.org/10.56952/arma-2022-0672" @default.
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