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Ali Yaghoubi
Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada

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Journal article
Published: 12 June 2021 in Geosciences
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This study focuses on determining the orientation and constraining the magnitude of present-day stresses in the Dezful Embayment in Iran’s Zagros Fold and Thrust Belt. Two datasets are used: the first includes petrophysical data from 25 wells (3 to 4 km deep), and the second contains 108 earthquake focal mechanisms, mostly occurring in blind active basement faults (5 to 20 km deep). Formal stress inversion analysis of the focal mechanisms demonstrates that there is currently a compressional stress state (Aφ=2.02.2) in the basement. The seismologically determined SHmax direction is 37° ± 10°, nearly perpendicular to the strike of most faults in the region. However, borehole geomechanics analysis using rock strength and drilling evidence leads to the counterintuitive result that the shallow state of stress is a normal/strike-slip regime. These results are consistent with the low seismicity level in the sedimentary cover in the Dezful Embayment, and may be evidence of stress decoupling due to the existence of salt layers. The stress state situation in the field was used to identify the optimally oriented fault planes and the fault friction coefficient. This finding also aligns with the prediction Coulomb faulting theory in that the N-S strike-slip basement Kazerun Fault System has an unfavorable orientation for slip in a reverse fault regime with an average SW-NE SHmax orientation. These results are useful for determining the origin of seismic activity in the basin and better assessing fault-associated seismic hazards in the area.

ACS Style

Ali Yaghoubi; SeyedBijan Mahbaz; Maurice Dusseault; Yuri Leonenko. Seismicity and the State of Stress in the Dezful Embayment, Zagros Fold and Thrust Belt. Geosciences 2021, 11, 254 .

AMA Style

Ali Yaghoubi, SeyedBijan Mahbaz, Maurice Dusseault, Yuri Leonenko. Seismicity and the State of Stress in the Dezful Embayment, Zagros Fold and Thrust Belt. Geosciences. 2021; 11 (6):254.

Chicago/Turabian Style

Ali Yaghoubi; SeyedBijan Mahbaz; Maurice Dusseault; Yuri Leonenko. 2021. "Seismicity and the State of Stress in the Dezful Embayment, Zagros Fold and Thrust Belt." Geosciences 11, no. 6: 254.

Journal article
Published: 13 January 2021 in Applied Sciences
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Renewable and sustainable energy sources can play an important role in meeting the world’s energy needs and also in addressing environmental challenges such as global warming and climate change. Geothermal well-doublet systems can produce both electrical and thermal energy through extracting heat from hot-water aquifers. In this paper, we examine some potential challenges associated with the operation of well-doublet systems, including heat conductivity, chemical, and mechanical issues. In these systems, geomechanics issues such as thermal short-circuiting and induced seismicity arise from temperature and pressure change impacts on the stress state in stiff rocks and fluid flow in fractured rock masses. Coupled chemical processes also can cause fluid channeling or formation and tubular goods plugging (scaling) with precipitates. Mechanical and chemical disequilibrium conditions lead to increased production uncertainties; hence risk, and therefore coupled geo-risk assessments and optimization analyses are needed for comparative commercialization evaluations among different sites. The challenges related to heat transfer processes are also examined. These studies can help better understand the issues that may arise during the operation of geothermal well-doublet systems and improve their effectiveness, subsequently reducing associated costs and risks.

ACS Style

Seyed Bijan Mahbaz; Ali Yaghoubi; Alireza Dehghani-Sanij; Erfan Sarvaramini; Yuri Leonenko; Maurice B. Dusseault. Well-Doublets: A First-Order Assessment of Geothermal SedHeat Systems. Applied Sciences 2021, 11, 697 .

AMA Style

Seyed Bijan Mahbaz, Ali Yaghoubi, Alireza Dehghani-Sanij, Erfan Sarvaramini, Yuri Leonenko, Maurice B. Dusseault. Well-Doublets: A First-Order Assessment of Geothermal SedHeat Systems. Applied Sciences. 2021; 11 (2):697.

Chicago/Turabian Style

Seyed Bijan Mahbaz; Ali Yaghoubi; Alireza Dehghani-Sanij; Erfan Sarvaramini; Yuri Leonenko; Maurice B. Dusseault. 2021. "Well-Doublets: A First-Order Assessment of Geothermal SedHeat Systems." Applied Sciences 11, no. 2: 697.