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Title: Seismic rupture and ground accelerations induced by CO2 injection in the shallow crust

Abstract

We present that because of the critically stressed nature of the upper crust, the injection of large volumes of carbon dioxide (CO2) into shallow geological reservoirs can trigger seismicity and induce ground deformations when the injection increases the fluid pressure in the vicinity of potentially seismic faults. The increased fluid pressure reduces the strength against fault slip, allowing the stored elastic energy to be released in seismic events that can produce felt ground accelerations. Here, we seek to explore the likelihood ground motions induced by a CO2 injection using hydromechanical modelling with multiphase fluid flow and dynamic rupture, including fault-frictional weakening. We extend the previous work of Cappa and Rutqvist, in which activation of a normal fault at critical stress may be possible for fast rupture nucleating by localized increase in fluid pressure and large decrease in fault friction. In this paper, we include seismic wave propagation generated by the rupture. For our assumed system and injection rate, simulations show that after a few days of injection, a dynamic fault rupture of few centimetres nucleates at the base of the CO2 reservoir and grows bilaterally, both toward the top of the reservoir and outside. The rupture is asymmetric and affectsmore » a larger zone below the reservoir where the rupture is self-propagating (without any further pressure increase) as a result of fault-strength weakening. The acceleration and deceleration of the rupture generate waves and result in ground accelerations (~0.1–0.6 g) consistent with observed ground motion records. Finally, the maximum ground acceleration is obtained near the fault, and horizontal accelerations are generally markedly higher than vertical accelerations.« less

Authors:
 [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Univ. of California, Berkeley, CA (United States); University of Nice Sophia-Antipolis, Cote d Azur Observatory, Sophia-Antipolis (France). GeoAzur
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1407161
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Volume: 190; Journal Issue: 3; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Dynamics and mechanics of faulting; Earthquake dynamics; Mechanics, theory, and modeling; Permeability and porosity; Geomechanics

Citation Formats

Cappa, Frédéric, and Rutqvist, Jonny. Seismic rupture and ground accelerations induced by CO2 injection in the shallow crust. United States: N. p., 2012. Web. doi:10.1111/j.1365-246X.2012.05606.x.
Cappa, Frédéric, & Rutqvist, Jonny. Seismic rupture and ground accelerations induced by CO2 injection in the shallow crust. United States. doi:10.1111/j.1365-246X.2012.05606.x.
Cappa, Frédéric, and Rutqvist, Jonny. Sat . "Seismic rupture and ground accelerations induced by CO2 injection in the shallow crust". United States. doi:10.1111/j.1365-246X.2012.05606.x. https://www.osti.gov/servlets/purl/1407161.
@article{osti_1407161,
title = {Seismic rupture and ground accelerations induced by CO2 injection in the shallow crust},
author = {Cappa, Frédéric and Rutqvist, Jonny},
abstractNote = {We present that because of the critically stressed nature of the upper crust, the injection of large volumes of carbon dioxide (CO2) into shallow geological reservoirs can trigger seismicity and induce ground deformations when the injection increases the fluid pressure in the vicinity of potentially seismic faults. The increased fluid pressure reduces the strength against fault slip, allowing the stored elastic energy to be released in seismic events that can produce felt ground accelerations. Here, we seek to explore the likelihood ground motions induced by a CO2 injection using hydromechanical modelling with multiphase fluid flow and dynamic rupture, including fault-frictional weakening. We extend the previous work of Cappa and Rutqvist, in which activation of a normal fault at critical stress may be possible for fast rupture nucleating by localized increase in fluid pressure and large decrease in fault friction. In this paper, we include seismic wave propagation generated by the rupture. For our assumed system and injection rate, simulations show that after a few days of injection, a dynamic fault rupture of few centimetres nucleates at the base of the CO2 reservoir and grows bilaterally, both toward the top of the reservoir and outside. The rupture is asymmetric and affects a larger zone below the reservoir where the rupture is self-propagating (without any further pressure increase) as a result of fault-strength weakening. The acceleration and deceleration of the rupture generate waves and result in ground accelerations (~0.1–0.6 g) consistent with observed ground motion records. Finally, the maximum ground acceleration is obtained near the fault, and horizontal accelerations are generally markedly higher than vertical accelerations.},
doi = {10.1111/j.1365-246X.2012.05606.x},
journal = {Geophysical Journal International},
number = 3,
volume = 190,
place = {United States},
year = {2012},
month = {9}
}

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    Works referencing / citing this record:

    The application of a neural network to map clay zones in crystalline rock
    journal, November 2013

    • Meller, Carola; Genter, Albert; Kohl, Thomas
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    The application of a neural network to map clay zones in crystalline rock
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