Seismicity and the State of Stress in the Dezful Embayment, Zagros Fold and Thrust Belt

Yaghoubi, Ali; Mahbaz, SeyedBijan; Dusseault, Maurice B.; Leonenko, Yuri

doi:10.1002/essoar.10504243.1

Cited by 2 publications

(3 citation statements)

References 80 publications

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“…When determining a strike-slip (or thrust) stress state tensor, the most difficult parameter to determine is the maximum principal stress magnitude (S Hmax ). However, borehole failure data, together with knowledge of horizontal and vertical stresses, can be utilized to limit the range of S Hmax magnitude (Yaghoubi et al 2021). Additionally, earthquake focal mechanisms provide helpful information on the relative stress magnitude as well as the maximum principal stress.…”

Section: State Of Stress Around Grande Prairiementioning

confidence: 99%

“…Simpson (1997) generalized the ϕ values to determine the relative stress magnitudes in each stress regime by the equation: A ϕ = (n + 0.5) + (−1) n (ϕ − 0.5) where n = 0, 1, 2, for normal, strike-slip and reverse faulting respectively. A ϕ ranges continuously from 0 to 1 for normal faults, 1 to 2 for strike-slip faults, and 2 to 3 for reverse faults (Hurd and Zoback 2012;Yaghoubi et al 2021). Simpson's approach was applied to the 50 compiled focal mechanisms, showing that a strike-slip fault system dominates the area, with an average Anderson fault parameter of A ϕ ≈ 1.19 around Musreau Lake The cumulative probability function of the required injection pressure to cause slip on each fault segment patch.…”

Section: State Of Stress Around Grande Prairiementioning

confidence: 99%

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Probabilistic assessment of induced seismicity at the Alberta No. 1 geothermal project site

et al. 2023

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Alberta No.1 is a geothermal project targeting deep carbonate, conglomerates, and sandstone formations in a potential production and injection zone for geothermal energy exploitation within the Municipal District of Greenview south of Grande Prairie, Alberta, Canada. In geothermal systems without a steam fraction (typically systems under 170°C), rapid widespread pore pressure changes and slow temperature changes have led to increased deviatoric stresses, resulting in induced seismicity. A concern for the Alberta No.1 Geothermal Project is that anthropogenic seismicity from oil, gas, and well field fluid injection has created felt events in Alberta. Thus, at the beginning of this type of project, it is prudent to review the potential for induced seismicity. In this study, a geomechanical study of the Leduc and Granite Wash Formations, two potential geothermal fluid exploitation zones, has been undertaken based on borehole geophysics and regional injection-induced earthquake data. Determining subsurface properties such as state of stress, pore pressure, and fault properties, however, poses uncertainties in the absence of actual data from the target formations. Geomechanical analysis results (with associated uncertainties) are used to assess the potential for injection-induced earthquakes. A Monte Carlo probability analysis is employed to estimate the likelihood of slippage of the known faults close to the Alberta No.1 Geothermal Project. A cumulative distribution function of the critical pore pressure on each fault is derived from the local tectonic stress state and Mohr-Coulomb shear parameter analyses. The resultant probabilistic fault stability maps can serve as a baseline for future fluid injection projects in the region including wastewater disposal, hydraulic fracture stimulation, CO2 sequestration, as well as geothermal energy extraction.

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Section: State Of Stress Around Grande Prairiementioning

confidence: 99%

Section: State Of Stress Around Grande Prairiementioning

confidence: 99%

Probabilistic assessment of induced seismicity at the Alberta No. 1 geothermal project site

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Simpson 52 generalized the parameter ϕ values to provide a quantitative measure with which to determine the relative stress magnitudes in each stress regime by expressing the equation as A ϕ = (n + 0.5) + (−1) n (ϕ − 0.5) with n = 0, 1, 2, for normal, strike-slip and reverse faulting respectively. The Anderson fault parameter A ϕ ranges continuously from 0 to 1 for normal, 1 to 2 for strike-slip, and 2 to 3 for reverse faults [53][54][55] .…”

Section: State Of Stress In the Montney Formationmentioning

confidence: 99%

Injection-induced fault slip assessment in Montney Formation in Western Canada

Yaghoubi

Dusseault

Leonenko

2022

Sci Rep

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Hydraulic stimulation to enhance energy extraction from geothermal and unconventional resources is typically accompanied by seismicity because injection changes pore pressures and temperatures, facilitating slippage of fractures and faults. Induced seismicity carries potential risk if events are large enough to damage infrastructure. The uncertainty invariably associated with the state of stress measurements and subsurface geomechanics parameters affects the analysis of fault slip and seismicity induced resulting from hydraulic fracturing. In this study, a probabilistic approach is used to assess the slip tendency of known faults crossing the compartmentalized Montney Formation of western Alberta and northeastern British Columbia. We first divide the formation into four different stress areas based on pore pressure deviations from hydrostatic. In each stress area, geomechanics parameters are expressed as probability distributions using multivariable datasets from borehole petrophysical data to injection-induced focal mechanisms. Monte Carlo simulations are applied to assess the potential slip tendency of local faults. We display the cumulative distribution function of critical pore pressure to cause slip on each fault by using analyses of the parameters of the Mohr–Coulomb shear failure criterion and local tectonic stress state. The results provide useful input for seismic hazard assessment and risk mitigation for local faults affected by high-rate fluid injection.

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Seismicity and the State of Stress in the Dezful Embayment, Zagros Fold and Thrust Belt

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Cited by 2 publications

References 80 publications

Probabilistic assessment of induced seismicity at the Alberta No. 1 geothermal project site

Probabilistic assessment of induced seismicity at the Alberta No. 1 geothermal project site

Injection-induced fault slip assessment in Montney Formation in Western Canada

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