A: alluvial deposits M: marine deposits R: Rocks T: till
M. M. Miranda
(mafalda_alexandra.miranda@ete.inrs.ca)
, N. Giordano
(nicolo.giordano@ete.inrs.ca)
,
I. Kanzari
(Ines.Kanzari@ete.inrs.ca)
, J. Raymond
(jasmin.raymond@inrs.ca)
, C. Dezayes
(c.dezayes@brgm.fr)
0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 λ w ate r-s at ur ate d (W m -1 K -1 ) λ in-situ (W m-1 K-1)
Comparison of thermal conductivities (λ) measured under in-situ and water-saturated
conditions
Rock and soil samples
ERT (Electrical Resistivity Tomography)
Temperature logs
Shallow and deep geothermal resources assessment in
northern communities of Québec: preliminary results from
Kuujjuaq
Further work
•
Thermal and hydraulic properties analysis of rock samples – surface and
drilled core;
•
Heat flow and temperature gradient estimations;
•
Fracture network characterization;
•
Borehole heat exchangers efficiency in permafrost;
•
Economic viability of geothermal energy systems
Fracture analysis in scanlines
Aims
- Identification of bedrock depth - Definition of permafrost state
Methodology
ERT surveys were carried out in 4 different
sites selected by Kativik Regional Governement (KRG) as the most compelling to aim at
reducing fossil fuel dependency: these are
drinking water facilities (2, 3) and greenhouses (4) for local fruit and vegetable growing.
Wenner-Schlumberger and Dipole-Dipole configurations were adopted with 2-3 m spacing depending on the local setting.
Objectives
Renewable and affordable energy production is a key aspect for the development of Canadian northern communities. In these remote areas, heat and electricity are mostly obtained by burning fossil fuels incurring high economical and environmental costs. Implementing geothermal technologies would diversify their energy sources while decreasing CO2 emission.
The project’s objectives are to determine the potential and viability of exploiting geothermal resources in the North of Québec, namely in the community of Kuujjuaq, by means of three main geothermal energy systems:
1) Underground Thermal Energy Storage, 2) Shallow Ground-Source Heat Pumps,
3) Deep Geothermal Systems – Enhanced Geothermal Systems (EGS) and deep borehole heat exchangers.
Map of the quaternary
sediments Glacial Outcrops Organic Marine Alluvial
Legend 1. Calibration site 2 3 4 W18 sands/silts bedrock 8 24 W19 2 12 GW flow Calibration site a-priori info
Inferred geological section
Greenhouses
Inferred geological section
Marine saturated sediments 100-700 Ohm.m
GH
Gravel pad anti-permafrost >1000 Ohm.m 0 10 20 30 40 50 60 70 80 90 100 0 1 2 De pt h (m ) T (°C) Well 19 0 10 20 30 40 50 60 70 80 90 -1 0 1 2 De pt h (m ) T (°C) Well 18 0 5 10 15 20 25 30 35 40 45 50 0 1 2 De pt h (m ) T (°C) Well 16 0 20 40 60 80 100 120 140 0 2 4 De pt h (m ) T (°C) FAU-16-004 0 20 40 60 80 100 120 0 2 4 De pt h (m ) T (°C) FAU-16-010 N granite diorite paragneiss tonalite gabbro and diorite N
In-situ thermal conductivity map of soil samples
Scale
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