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TitleA hypothetical geomechanics model for the assessment of potential environmental impact of shale gas fracking - Part I: from ground water perspective
AuthorWang, B
SourceGeoMontréal 2013, Proceedings of the Canadian Geotechnical Conference; 2013 p. 1-8
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20130043
PublisherCanadian Geotechnical Society
MeetingGéoMontréal 2013, the 66th Canadian Geotechnical Conference and the 11th Joint CGS/IAH-CNC Groundwater Conference; Montreal; CA; September 29 - October 3, 2013
Documentbook
Lang.English
Mediapaper
File formatpdf
Subjectsfossil fuels; environmental geology; hydrogeology; shales; environmental impacts; groundwater; groundwater pollution; groundwater resources; models; modelling; mechanical analyses; fluid mechanics; Utica Shale; shale gas; fracking
Illustrationslocation maps; cross-sections; graphs; plots
ProgramShale Gas - groundwater, Environmental Geoscience
AbstractA hypothetical geomechanics model is presented for the assessment of ground condition change in response to shale gas extraction in the Utica shale region, eastern Canada. It is based on the fact that hydraulic fracturing reduces the stiffness of the shale unit and alters the in-situ stress. If a large body of rock is fractured, stress would re-distribute itself in the overall rock structure. A discontinuum model was used for the analysis. The results confirmed the hypothesis. Based on the level of ground deformation obtained from this study and other reported data, the hydraulic conductivity of the caprock may experience an increase by one to two orders of magnitude. This may cause regional ground water flow regime change that should be further studied.
Summary(Plain Language Summary, not published)
A hypothetical geomechanical model is presented for the assessment of ground condition change in response to shale gas extraction in the Utica shale region, Eastern Canada. It is based on the fact that hydraulic fracturing reduces the stiffness of the shale unit. If a large body of rock is fractured, stress would re-distribute itself in the overall rock structure. A discontinuum model was used for the analysis. The results confirmed the hypothesis. Based on the level of ground deformation obtained from this study and other reported data, the hydraulic conductivity of the caprock may experience an increase by one to two orders of magnitude. This may cause regional ground water flow regime change that should be further studied.
GEOSCAN ID292567