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Deep geothermal resource assessment of the St. Lawrence Lowlands sedimentary basin (Québec) based on 3D regional geological modelling
Geomechanics and Geophysics for Geo-Energy and Geo-Resources ( IF 5 ) Pub Date : 2020-07-10 , DOI: 10.1007/s40948-020-00170-0
Karine Bédard , Félix-Antoine Comeau , Jasmin Raymond , Erwan Gloaguen , Michel Malo , Marc-André Richard

Geothermal resource quantification requires underground temperature and volume information, which can be challenging to accurately assess at the regional scale. The analytical solution for steady-state heat conduction with internal heat generation is often used to calculate temperature at depth, while geological models can provide volume information. Both approaches were originally combined in a single 3D geological model, in which the underground temperature is directly computed, to accurately evaluate geothermal resources suitable for power generation in the St. Lawrence Lowlands sedimentary basin covering 18,000 km2 in Quebec, Canada, and improve methods for geothermal resource quantification. This approach, used for the first time at such a large scale, allowed to determine the volume of each thermal unit providing a detail assessment of resource depth, temperature and host geological formation. Only 5% of geothermal resources at a temperature above 120 °C that is suitable for power generation were shown to be hosted in the Cambro-Ordovician sedimentary rock sequences at a depth of 4 to 6 km, while 95% of the resource is hosted by the underlying Precambrian basement.

中文翻译:

基于3D区域地质建模的圣劳伦斯低地沉积盆地(魁北克)的深层地热资源评估

地热资源定量化需要地下温度和体积信息,而这对于在区域范围内准确评估可能具有挑战性。具有内部热量产生的稳态热传导的解析解决方案通常用于计算深度温度,而地质模型可以提供体积信息。两种方法最初都组合在一个3D地质模型中,该模型直接计算地下温度,以准确评估适用于圣劳伦斯低地沉积盆地18,000 km 2的发电的地热资源。在加拿大魁北克,并改进了地热资源量化的方法。这种方法首次大规模使用,可以确定每个热力单元的体积,从而提供资源深度,温度和宿主地质构造的详细评估。在适合于发电的120°C以上的温度下,只有5%的地热资源蕴藏在4至6 km深度的Cambro-Ordovician沉积岩层中,而95%的资源蕴藏于底层的前寒武纪基底。
更新日期:2020-07-10
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