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TitreAssessing 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
TéléchargerTéléchargement (publication entière)
AuteurRivard, C
SourcePublic presentations: Environmental Geoscience Program, current status of research projects, May 2017; par Jacob, N; Ahad, J; Gammon, P; Rivard, C; Kao, H; White, D; Parsons, M; Galloway, J; Commission géologique du Canada, Présentation scientifique 70, 2017 p. 32-48, https://doi.org/10.4095/304683
Année2017
ÉditeurRessources naturelles Canada
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.4095/304683
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans 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, Commission géologique du Canada, Présentation scientifique no. 70
Formatspptx
ProvinceNouveau-Brunswick
SNRC21H/10; 21H/11; 21H/12; 21H/13; 21H/14; 21H/15; 21I/02; 21I/03; 21I/04
Lat/Long OENS -65.5842 -64.9228 46.0244 45.5872
Sujetsetudes de l'environnement; effets sur l'environnement; substances polluantes; géologie du substratum rocheux; lithologie; roches sédimentaires; ampélites; grès; caractéristiques structurales; failles; eau souterraine; aquifères; résurgence des eaux souterraines; écoulement de la nappe d'eau souterraine; mouvement des eaux souterraines; ressources pétrolières; hydrocarbures; gaz; méthane; ethane; condensat; fracturation hydraulique; migration des fluides; fluage; roches reservoirs; qualité de l'eau; géochimie des eaux souterraines; puits de gaz; puits de pétrole; puits d'observation; échantillons de sondage; géochimie des éléments majeurs; géochimie des éléments en trace; métaux; isotopes; trous de mine; diagraphie géophysique; diagraphie des sondages; échantillons carrotés; interprétations géophysiques; interpretations sismiques; analyses hydrauliques; hydraulique; salinité; établissement de modèles; Argile d'Utica ; Membre d'Hiram Brook ; Membre de Frederick Brook ; Groupe de Lorraine ; Groupe de Trenton ; Groupe de Windsor ; Groupe de Mabou ; Groupe d'Horton ; Approvisionnement en eau; géologie de l'environnement; combustibles fossiles; hydrogéologie; géologie structurale; géophysique; géologie de l'ingénieur; géochimie; Phanérozoïque; Paléozoïque; Carbonifère; Dévonien
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
ProgrammeGestion du programme, Géosciences de l'environnement
ProgrammeInitiative écoÉNERGIE sur l'innovation
ProgrammeLe Programme de recherche et de développement énergétiques (PRDE)
Diffusé2017 09 14
Résumé(disponible en anglais seulement)
A 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