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Collaborating Authors
Rebel, Estelle
Geomechanical Approach of Induced Seismicity using Cohesive Zone Elements
Pouya, Amade (Laboratoire Navier (IFSTTAR, CNRS, ENPC), Ecole des Ponts ParisTech, Marne-la-Vallée) | Deptulski, Rafael (Laboratoire Navier (IFSTTAR, CNRS, ENPC), Ecole des Ponts ParisTech, Marne-la-Vallée) | Ahn, Kyeung Hye (Laboratoire Navier (IFSTTAR, CNRS, ENPC), Ecole des Ponts ParisTech, Marne-la-Vallée) | Rebel, Estelle (TotalEnergies, CSTJF) | Boisson, Michel (TotalEnergies, CSTJF)
Abstract This study aims to demonstrate the capability to account for seismic and aseismic responses due to fault reactivation using a cohesive zone model in a Finite Element framework. We adopt an elastic-damage-plastic formulation to predict the fault reactivation while considering unilateral effects observed in geomaterials. In a conceptual 2D problem representing two layers of rock separated by an existing fault, we apply displacement-driven and stress-driven shear loading to provide a first characterization of the instabilities and energy dissipation. Qualitative and quantitative analyses of the dissipative process are provided through the shear stress field and the evolution of the shear stress, displacement, and energy balance. We obtain through the present model the total of dissipated energy thanks to the energy balance. Also, while the elastic energy variation can be positive or negative depending on the type of boundary conditions (stress-driven or displacement-driven), the radiated elastic energy is always positive during seismic events. It is so a good candidate to determine the seismic moment. Introduction Instabilities in faulted mechanical systems are at the heart of numerous recent studies related to micro-seismic phenomena induced by human activities. Increasing interest to assess the potential for activation of existing faults in geologic sites has been observed in different applications such as CO2 sequestration (Nguyen et al., 2019), waste-water disposal (Walsh and Zoback, 2015), recovery of hydrocarbons (Davies et al., 2013), geothermal facilities (Majer et al., 2007) and nuclear waste disposal (Urpi et al., 2019). Several previous studies showed that both natural and anthropogenic factors determine fault reactivation phenomena (McGarr, 2014; Segall and Lu, 2015; Fan et al., 2016). The lack of long-term historical monitoring of seismic activity in candidate sites to host in-deep geological applications is an important drawback to assess the risks through empirical models. For this reason, numerical models were mainly used to predict fault reactivation response (e.g. finite element method (Haddad and Eichhubl, 2020), discrete element method (Langhi et al., 2010), finite difference method (Lee et al., 2013)).
- Europe (0.46)
- North America > United States (0.28)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (0.90)
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Lifecycle > Disposal/Injection (0.48)
Induced seismicity in the Dallas-Fort Worth Basin: Enhanced seismic catalogue and evaluation of fault slip potential
Li, Bing Q. (California Institute of Technology) | Avouac, Jean-Philippe (California Institute of Technology) | Ross, Zachary E. (California Institute of Technology) | Du, Jing (Total E&P Research and Technology, LLC) | Rebel, Estelle (Total S.A.)
We present an updated catalogue of seismicity in the Dallas-Fort Worth basin from 2008 to the end of 2019 using state-of-the-art phase picking and association methods based on machine learning. We then calculate the pore pressure and poroelastic stress changes on a monthly basis between 2000 and 2020 for the whole basin, incorporating fluid injection/extraction histories at 104 saltwater injection and 20576 production wells. These pore pressure and poroelastic stress changes are calculated using coupled analytical solutions for a point source injection in a 3D homogeneous isotropic medium, and are superposed for all wells. We suggest that the poroelastic effects of produced gas and water contribute significantly to fault instability. Presentation Date: Monday, October 12, 2020 Session Start Time: 1:50 PM Presentation Time: 2:40 PM Location: 360A Presentation Type: Oral
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (1.00)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- North America > United States > Texas > Fort Worth Basin > Barnett Shale Formation (0.99)
- North America > United States > Wyoming > Airport Field (0.89)
- North America > Canada > Alberta > Venus Field > Alcon Ioe Venus 1-8-100-9 Well (0.89)