The Liard Basin Hydrocarbon Project is a multi-year (2012-15) investigation of the natural gas potential of the southwestern NWT. We are specifically interested in the Middle Devonian to Carboniferous age (392 to 326 million years old) shales. These shales, known as the Besa Formation, may be associated with significant quantities of hydrocarbons (such as natural gas). The project is a scientific collaboration between the geological surveys of the Northwest and Yukon Territories and the BC Ministry of Energy, Mines, and Natural Gas – Geoscience Division. All jurisdictions have agreed that there are universal benefits to a coordinated, collaborative approach to the understanding of the geology of this highly prospective shale.
The study area lies in southeastern NWT near Fort Liard. In 2012 and 2013, five outcrops approximately km north of Fort Liard were studied. The outcrop locations are marked on the map to the left with colored ‘x’s (Red - 2012 and Blue - 2013). Five wells were sampled in 2014 and are marked on the map with green squares.
In recent years, industry has successfully drilled for hydrocarbons associated with Upper and Lower Besa River shales in the British Columbia portion of the Liard Basin. These same formations can be associated to the same formations north of the 60th parallel in the Northwest Territories and Yukon. The presence of infrastructure in the Liard area of the Northwest Territories makes this region an area of geoscientific focus for our group.
The field program will collect data to determine source rock characteristics of strata examined as well as to provide datasets to aid in regional correlation between other surface sections and subsurface wells. At each section detailed lithologic descriptions are completed. Spectral gamma-radiation counts are measured with a handheld spectrometer at one-metre intervals. Shale chip samples are collected at two-metre intervals for: rock-eval/total organic carbon (RE/TOC), vitrinite reflectance (VR), lithogeochemistry, x-ray diffraction mineralogy (XRD), and microfossil biostratigraphy. Similar studies will be conducted on samples collected from subsurface wells.
2012 – Scoping fieldwork: three measured and sampled stratigraphic sections completed (NT/YT/BC).
2013 – Fieldwork: two measured and sampled stratigraphic sections completed (NT).
2014 – Well sampling: cuttings from five wells sampled through black shale units (NT).
2015 – Collaborative hydrocarbon resource assessment with NEB
2016 – Project synthesis publication.
Partners and Support
Kathryn Fiess and Jonathan Rocheleau– Northwest Territory Geological Survey
Dr. Leanne Pyle – VI Geosciences
Filippo Ferri – BC Ministry of Energy, Mines, and Natural Gas
Tiffani Fraser – Yukon Geological Survey
Dr. Matt Hutchinson – Yukon Geological Survey
Margot McMechan – Geological Survey of Canada
Liard Basin, Besa River Formation, Northwest Territories, RE/TOC, Chemostratigraphy, Devonian shales, Carboniferous shales, Shale gas play, vitrinite reflectance, rock- eval, total organic carbon