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Title: Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2

Abstract

The interaction between mechanical deformation and fluid flow in fault zones gives rise to a host of coupled hydromechanical processes fundamental to fault instability, induced seismicity, and associated fluid migration. In this paper, we discuss these coupled processes in general and describe three modeling approaches that have been considered to analyze fluid flow and stress coupling in fault-instability processes. First, fault hydromechanical models were tested to investigate fault behavior using different mechanical modeling approaches, including slip interface and finite-thickness elements with isotropic or anisotropic elasto-plastic constitutive models. The results of this investigation showed that fault hydromechanical behavior can be appropriately represented with the least complex alternative, using a finite-thickness element and isotropic plasticity. We utilized this pragmatic approach coupled with a strain-permeability model to study hydromechanical effects on fault instability during deep underground injection of CO{sub 2}. We demonstrated how such a modeling approach can be applied to determine the likelihood of fault reactivation and to estimate the associated loss of CO{sub 2} from the injection zone. It is shown that shear-enhanced permeability initiated where the fault intersects the injection zone plays an important role in propagating fault instability and permeability enhancement through the overlying caprock.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Earth Sciences Division
OSTI Identifier:
991959
Report Number(s):
LBNL-3855E
Journal ID: ISSN 1750-5836; TRN: US201021%%430
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Related Information: Journal Publication Date: 2010; Journal ID: ISSN 1750-5836
Country of Publication:
United States
Language:
English
Subject:
54; 58; DEFORMATION; FLUID FLOW; INSTABILITY; PERMEABILITY; PLASTICITY; SEISMICITY; SIMULATION; SLIP

Citation Formats

Cappa, F, and Rutqvist, J. Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2. United States: N. p., 2010. Web. doi:10.1016/j.ijggc.2010.08.005.
Cappa, F, & Rutqvist, J. Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2. United States. https://doi.org/10.1016/j.ijggc.2010.08.005
Cappa, F, and Rutqvist, J. Tue . "Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2". United States. https://doi.org/10.1016/j.ijggc.2010.08.005. https://www.osti.gov/servlets/purl/991959.
@article{osti_991959,
title = {Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2},
author = {Cappa, F and Rutqvist, J},
abstractNote = {The interaction between mechanical deformation and fluid flow in fault zones gives rise to a host of coupled hydromechanical processes fundamental to fault instability, induced seismicity, and associated fluid migration. In this paper, we discuss these coupled processes in general and describe three modeling approaches that have been considered to analyze fluid flow and stress coupling in fault-instability processes. First, fault hydromechanical models were tested to investigate fault behavior using different mechanical modeling approaches, including slip interface and finite-thickness elements with isotropic or anisotropic elasto-plastic constitutive models. The results of this investigation showed that fault hydromechanical behavior can be appropriately represented with the least complex alternative, using a finite-thickness element and isotropic plasticity. We utilized this pragmatic approach coupled with a strain-permeability model to study hydromechanical effects on fault instability during deep underground injection of CO{sub 2}. We demonstrated how such a modeling approach can be applied to determine the likelihood of fault reactivation and to estimate the associated loss of CO{sub 2} from the injection zone. It is shown that shear-enhanced permeability initiated where the fault intersects the injection zone plays an important role in propagating fault instability and permeability enhancement through the overlying caprock.},
doi = {10.1016/j.ijggc.2010.08.005},
url = {https://www.osti.gov/biblio/991959}, journal = {International Journal of Greenhouse Gas Control},
issn = {1750-5836},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {6}
}