Investigation on the origin of shallow hydrocarbons found in the Carboniferous sub-basin of southern New Brunswick

C. Rivard, G. Bordeleau, D. Lavoie, F. Huchet, R. Lefebvre, M.J. Duchesne, N. Pinet, V. Brake, H. Crow, S. Séjourné, X. Malet

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Mining, Energy Development and Groundwater II

ABSTRACT: The objective of this project is to assess potential impacts of shale gas activities on shallow groundwater via upward fluid migration. The study area is located in the Sussex region, in southern New Brunswick. Since very few data are available on the intermediate zone, located below shallow aquifers and above gas reservoirs, indirect multi-source data from five disciplines were integrated to provide a better understanding of the system. Dissolved methane in groundwater shows ambiguous isotopic composition. However, the geochemical interpretation based on multiple samples from regular monitoring seems to point towards a microbial origin for most of them. Geomechanical properties indicate that the intermediate zone acts as an efficient barrier to protect shallow aquifers.

RÉSUMÉ: -Brunswick. Étant donné que peu de données sont disponibles dans la zone intermédiaire, située sous les aquifères superficiels et au-dessus des réservoirs gaziers, des données indirectes et multi-sources issues de cinq disciplines ont été intégrées afin de e ambigüe. constitue une barrière efficace qui protège les aquifères de surface.

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