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TitleAssessing groundwater vulnerability to shale gas activities in the Sussex area, southern New Brunswick / Évaluation de la vulnérabilité des aquifères à l'exploitation du gaz de shale dans la région de Sussex dans le sud du Nouveau-Brunswick
DownloadFree download (whole publication) (pdf 13950 KB)
AuthorRivard, C
SourcePublic presentations: Environmental Geoscience Program, current status of research projects, May 2017; by Jacob, N; Ahad, J; Gammon, P; Rivard, C; Kao, H; White, D; Parsons, M; Galloway, J; Geological Survey of Canada, Scientific Presentation 70, 2017 p. 32-48, https://doi.org/10.4095/304683
Year2017
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Jacob, N; Ahad, J; Gammon, P; Rivard, C; Kao, H; White, D; Parsons, M; Galloway, J; (2017). Public presentations: Environmental Geoscience Program, current status of research projects, May 2017, Geological Survey of Canada, Scientific Presentation no. 70
File formatpptx
ProvinceNew Brunswick
NTS21H/10; 21H/11; 21H/12; 21H/13; 21H/14; 21H/15; 21I/02; 21I/03; 21I/04
AreaSussex; Elgin
Lat/Long WENS -65.5842 -64.9228 46.0244 45.5872
Subjectsenvironmental geology; fossil fuels; hydrogeology; structural geology; geophysics; engineering geology; geochemistry; environmental studies; environmental impacts; pollutants; bedrock geology; lithology; sedimentary rocks; black shales; sandstones; structural features; faults; groundwater; aquifers; groundwater discharge; groundwater flow; groundwater movement; petroleum resources; hydrocarbons; gas; methane; ethane; condensate; hydraulic fracturing; fluid migration; fluid flow; reservoir rocks; water quality; groundwater geochemistry; gas wells; oil wells; observation wells; well samples; major element geochemistry; minor element geochemistry; metals; isotopes; boreholes; geophysical logging; well logging; core samples; geophysical interpretations; seismic interpretations; hydraulic analyses; hydraulics; salinity; modelling; McCully gas field; Elgin gas field; Utica Shale; Hiram Brook Member; Frederick Brook Member; Lorraine Group; Trenton Group; Sussex Group; Windsor Group; Mabou Group; Horton Group; water supply; caprock; microbial gas; thermogenic gas; rock eval analyses; Phanerozoic; Paleozoic; Carboniferous; Devonian
Illustrationslocation maps; photographs; schematic cross-sections; geological sketch maps; stratigraphic cross-sections; stratigraphic charts; 3-D images; seismic profiles; graphs; stratigraphic columns; core logs; photographs; spectra
ProgramManagement, Environmental Geoscience
ProgramecoENERGY Innovation Initiative
ProgramProgram of Energy Research and Development (PERD)
Released2017 09 14
AbstractA project studying potential hydrocarbon migration through natural pathways or fracking-induced fractures from deep (~2 km) Carboniferous shale or tight sand units to shallow aquifers was initiated in 2015 in the Sussex area, southern New Brunswick. The study area includes the McCully gas field that has been in production since 2001 and the Elgin field that is investigated for its condensate potential. Because the intermediate zone located between shallow aquifers and units targeted for hydrocarbon production is poorly characterized, this project relies on the integration of data from different earth science disciplines, including geology, geophysics, geomechanics, hydrogeology and water and rock geochemistry.
Fieldwork in 2016-2017 comprised the drilling of observation wells, borehole geophysics, hydraulic tests and groundwater and rock sampling. Initial groundwater chemistry shows that only a few wells contain methane (< 5 mg/L) with either a thermogenic (McCully gas field) or a microbial (Elgin area) signature. One well in the McCully gas field showed some ethane in groundwater, as well as small amounts of gaseous methane in core samples, while drill cuttings revealed the presence of long-chain hydrocarbons. Rock-Eval analyses of shallow cores showed very low S1, S2 and TOC values, except for that specific well. 3-D seismic data have been reprocessed and the resulting geological interpretation revealed that faults are mostly confined within the Horton Group, where the two units targeted by the industry are located. In addition, the geomechanical study concluded that the intermediate zone provides an effective barrier to induced fractures, based on well logs. The development of numerical groundwater flow models (from 1D to 3D) is ongoing. This study will provide a scientific basis to support informed decisions by provincial authorities on future hydrocarbon development.
GEOSCAN ID304683