Fracture Activation and Induced Seismicity During Long-Term Heat Production in Fractured Geothermal Reservoirs.
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| Title: | Fracture Activation and Induced Seismicity During Long-Term Heat Production in Fractured Geothermal Reservoirs. |
|---|---|
| Authors: | Jiang, Chuanyin1,2 (AUTHOR), Wang, Xiaoguang1 (AUTHOR) wangxiaoguang@cdut.edu.cn, Zhang, Fengshou3 (AUTHOR), Deng, Kai4 (AUTHOR), Lei, Qinghua5 (AUTHOR) |
| Source: | Rock Mechanics & Rock Engineering. Aug2022, Vol. 55 Issue 8, p5235-5258. 24p. |
| Subjects: | Induced seismicity, Streamlines (Fluids), Deviatoric stress (Engineering), Spatiotemporal processes, Hazard mitigation, Magnetotellurics |
| Abstract: | We study fracture activation and induced seismicity during the long-term heat production of fractured geothermal reservoirs. The fracture system is modeled by the discrete fracture network approach that realistically represents the distribution and behavior of natural fractures in the system. Using a novel fully coupled thermal-hydro-mechanical model, we systematically investigate the interplay among in situ stresses, injection pressure and temperature on the spatio-temporal evolution of heat production-induced seismicity. Our results show that in situ stress state exerts a fundamental background control on the seismicity occurrence, while injection-induced fluid pressurization and thermal perturbation act as two competing triggering factors. Induced seismic events occur mainly in the near field of the injection well and along the main streamlines of fluid flow through the reservoir. Under a low differential stress condition, fracture activation is dominated by late-stage thermal drawdown, such that the injection temperature controls the timing, magnitude and number of seismic events. However, under a high differential stress condition, the effect of early-stage pressurization dominates with critically stressed fractures activated once or twice. The fracture activation is sensitive to the variation of pressure gradient, whilst the injection temperature attempts to influence the magnitude but in general not the timing and number of thermal drawdown-induced secondary seismic events. Furthermore, these anthropogenic parameters (i.e. injection pressure and temperature) strongly affect the long-term thermal energy output of the reservoir. Our research findings have important implications for the mitigation of seismic hazards by optimizing production strategy design during heat extraction from deep geothermal reservoirs. Highlights: The interplay among in situ stresses, injection pressure and temperature on long-term heat production-induced seismicity is investigated. The seismicity triggering mechanism by simultaneous, transient propagations of hydrodynamic and thermal fronts is quantified. The spatial pattern of recurrent seismicity driven by thermal front migration in a critically stressed fracture system is analyzed. [ABSTRACT FROM AUTHOR] |
| Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Fracture Activation and Induced Seismicity During Long-Term Heat Production in Fractured Geothermal Reservoirs. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jiang%2C+Chuanyin%22">Jiang, Chuanyin</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Xiaoguang%22">Wang, Xiaoguang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wangxiaoguang@cdut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Fengshou%22">Zhang, Fengshou</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deng%2C+Kai%22">Deng, Kai</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lei%2C+Qinghua%22">Lei, Qinghua</searchLink><relatesTo>5</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Aug2022, Vol. 55 Issue 8, p5235-5258. 24p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Induced+seismicity%22">Induced seismicity</searchLink><br /><searchLink fieldCode="DE" term="%22Streamlines+%28Fluids%29%22">Streamlines (Fluids)</searchLink><br /><searchLink fieldCode="DE" term="%22Deviatoric+stress+%28Engineering%29%22">Deviatoric stress (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Spatiotemporal+processes%22">Spatiotemporal processes</searchLink><br /><searchLink fieldCode="DE" term="%22Hazard+mitigation%22">Hazard mitigation</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetotellurics%22">Magnetotellurics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We study fracture activation and induced seismicity during the long-term heat production of fractured geothermal reservoirs. The fracture system is modeled by the discrete fracture network approach that realistically represents the distribution and behavior of natural fractures in the system. Using a novel fully coupled thermal-hydro-mechanical model, we systematically investigate the interplay among in situ stresses, injection pressure and temperature on the spatio-temporal evolution of heat production-induced seismicity. Our results show that in situ stress state exerts a fundamental background control on the seismicity occurrence, while injection-induced fluid pressurization and thermal perturbation act as two competing triggering factors. Induced seismic events occur mainly in the near field of the injection well and along the main streamlines of fluid flow through the reservoir. Under a low differential stress condition, fracture activation is dominated by late-stage thermal drawdown, such that the injection temperature controls the timing, magnitude and number of seismic events. However, under a high differential stress condition, the effect of early-stage pressurization dominates with critically stressed fractures activated once or twice. The fracture activation is sensitive to the variation of pressure gradient, whilst the injection temperature attempts to influence the magnitude but in general not the timing and number of thermal drawdown-induced secondary seismic events. Furthermore, these anthropogenic parameters (i.e. injection pressure and temperature) strongly affect the long-term thermal energy output of the reservoir. Our research findings have important implications for the mitigation of seismic hazards by optimizing production strategy design during heat extraction from deep geothermal reservoirs. Highlights: The interplay among in situ stresses, injection pressure and temperature on long-term heat production-induced seismicity is investigated. The seismicity triggering mechanism by simultaneous, transient propagations of hydrodynamic and thermal fronts is quantified. The spatial pattern of recurrent seismicity driven by thermal front migration in a critically stressed fracture system is analyzed. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00603-022-02882-z Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 5235 Subjects: – SubjectFull: Induced seismicity Type: general – SubjectFull: Streamlines (Fluids) Type: general – SubjectFull: Deviatoric stress (Engineering) Type: general – SubjectFull: Spatiotemporal processes Type: general – SubjectFull: Hazard mitigation Type: general – SubjectFull: Magnetotellurics Type: general Titles: – TitleFull: Fracture Activation and Induced Seismicity During Long-Term Heat Production in Fractured Geothermal Reservoirs. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jiang, Chuanyin – PersonEntity: Name: NameFull: Wang, Xiaoguang – PersonEntity: Name: NameFull: Zhang, Fengshou – PersonEntity: Name: NameFull: Deng, Kai – PersonEntity: Name: NameFull: Lei, Qinghua IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 07232632 Numbering: – Type: volume Value: 55 – Type: issue Value: 8 Titles: – TitleFull: Rock Mechanics & Rock Engineering Type: main |
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