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Discussion papers
https://doi.org/10.5194/se-2019-61
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-61
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Mar 2019

Research article | 26 Mar 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Solid Earth (SE) and is expected to appear here in due course.

Fault slip envelope: A new parametric investigation tool for fault slip based on geomechanics and 3D fault geometry

Roger Soliva1, Frantz Maerten2, Laurent Maerten3, and Jussi Mattila4 Roger Soliva et al.
  • 1Geosciences Montpellier, Université de Montpellier, Campus Triolet, CC060, Place Eugène Bataillon, 34095 Montpellier CEDEX 05, France
  • 2Youwol, France
  • 3Schlumberger, 340 rue Louis Pasteur, 34790 Grabels, France
  • 4Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland

Abstract. By combining 3D boundary element model, frictional slip theory and fast computation method, we propose a new tool to improve fault slip analysis that allows to analyze a very large number of scenarios of stress and fault mechanical properties variations through space and time. Using both synthetic and real fault system geometries we analyze a very large number of numerical simulations (125,000) using fast iterative method to define for the first time macroscopic rupture envelopes for fault systems, referred to as “fault slip envelopes”. Fault slip envelopes are defined using variable friction, cohesion and stress state, and their shape is directly related to the fault system 3D geometry and the friction coefficient on fault surfaces. The obtained fault slip envelopes shows that very complex fault geometry implies low and isotropic strength of the fault system compared to geometry having limited fault orientations relative to the remote stresses, providing strong strength anisotropy. This technique is applied to the realistic geological conditions of the Olkiluoto high-level nuclear waste repository (Finland). The model results suggests that Olkiluoto fault system has a better probability to slip under the present day Andersonian thrust stress regime, than for the strike-slip and normal stress regimes expected in the future due to the probable presence of an ice sheet. This new tool allows to quantify the anisotropy of strength and probability of slip of 3D real fault networks as a function of a wide range of possible geological conditions an mechanical properties. This significantly helps to define the most conservative fault slip hazard case or to account for potential uncertainties in the input data for slip. This technique therefore applies to earthquakes hazard studies, geological storage, geothermal resources along faults and fault leaks/seals in geological reservoirs.

Roger Soliva et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Roger Soliva et al.
Roger Soliva et al.
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Short summary
We propose innovative parametric modeling allowing analysis of a very large number of fault-slip numerical simulations on 3-D discrete fault network. The approach allows for the first time producing failure envelopes of large rock volumes containing faults, using variations of geological conditions such as: remote stresses, cohesion, friction and fluid pressure. This tool helps to define the most conservative fault slip hazard case or to account for potential uncertainties in the input data.
We propose innovative parametric modeling allowing analysis of a very large number of fault-slip...
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