Modelling episodic induced seismicity with poroelastic dynamic rupture and large-scale wavefield propagation

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Abstract

Modelling dynamic rupture is essential to correctly describe the process of induced seismicity. Defmod, an open-source finite-element code featuring quasi-static loading, co-seismic volumetric strain, and dynamic rupture, is used to simulate the entire chain of induced seismicity, from pressure evolution due to fluid injection and extraction, building up of stress, and nucleation of dynamic faulting, to wavefield propagation towards the surface. To study induced earthquakes caused by fluid extraction, we modelled the behaviour of a 2-D poroelastic medium including a predefined fault by assigning a fluid source, either constant or varying, in a homogeneous reservoir layer to induce a pressure-field change. For each quasi-static step, the pressure field difference generates a displacement field that in turn affects the pressure through a coupling matrix, depending on Biot's coefficient. The rate of pressure variation is
subject to the fluid source as well as the material properties, e.g., porosity and fluid mobility, which affect the speed and distribution of the stress build-up on the fault and thus the pattern of rupture nucleation. In addition, we implemented a predefined pressure profile to simulate the induced rupture in case of a uniform depletion of the reservoir to allow for a comparison with other studies. The results
provide useful insights on the causality between reservoir-pressure behaviour and the induced seismicity.
Original languageEnglish
Number of pages1
Publication statusPublished - 2020
EventGeoUtrecht 2020 - Online due to COVID-19, Netherlands
Duration: 24 Aug 202026 Aug 2020
https://www.geoutrecht2020.org/

Conference

ConferenceGeoUtrecht 2020
Country/TerritoryNetherlands
Period24/08/2026/08/20
Internet address

Bibliographical note

Accepted Author Manuscript

Keywords

  • induced earthquakes
  • finite element method
  • poroelasticity
  • dynamic rupture
  • Defmod

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