当前位置: X-MOL 学术Geotherm. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Geothermal resource assessment of remote sedimentary basins with sparse data: lessons learned from Anticosti Island, Canada
Geothermal Energy ( IF 4.2 ) Pub Date : 2020-01-27 , DOI: 10.1186/s40517-020-0156-1
Violaine Gascuel , Karine Bédard , Félix-Antoine Comeau , Jasmin Raymond , Michel Malo

Anticosti Island is located in the Anticosti sedimentary basin, an Ordovician/Silurian carbonate platform. This platform is mainly composed of limestone and shale with some dolomite and sandstone and reaches up to 5 km depth in the southwest. It overlies a Precambrian basement of the Grenville Province made of magmatic and metamorphic rocks. Like most remote and off-grid regions in Canada, it relies heavily on fossil fuels for energy supplies. An assessment of deep geothermal resources was achieved in this area with the objective of diversifying energy resources to help develop renewable energy for villages deserved by micro-grid systems. Despite sparse and low-quality bottom-hole data (15 wells of 1111 m to 2762 m depth), a 3D temperature model was developed for this sedimentary basin and its underlying Precambrian basement up to 40 km (mantle depth). Quantifying confidence intervals for thermal parameters, namely bottom-hole temperature, thermal conductivity, heat generation rate and mantle heat flux, was paramount to obtain a reliable range of temperature predictions. A high variability of modeled temperature, up to 41% at the base of the sedimentary basin and 70% at mantle depth, remains when trying to constrain input parameters. The lack of equilibrium temperature measurements at depth affects the temperature predictions, both in the sedimentary basin and the Precambrian basement. It is an important issue to solve in further studies. Furthermore, knowledge of the thermal properties of the Precambrian basement of the Grenville Province and its geometry is poor. In addition, there is a wide confidence interval on thermal conductivity of specific lithologies in the Anticosti sedimentary basin. It has a significant impact on temperature predictions at depth and should be improved for studies focusing on electricity production. Despite a wide confidence interval on temperature predictions, geothermal electricity generation from reservoirs at 120 °C or more appears difficult in the current technical and economic context. Electricity generation at a low temperature with an inlet of 70 °C could be achieved at a reservoir depth of 2–4 km, but with a net efficiency of 10–11% (considering a flow rate of 40 l s−1 and a cooling temperature of 5 °C). Direct use of geothermal heat from the deepest part of the sedimentary basin seems to be the most realistic option, provided that sufficiently permeable horizons can be found.

中文翻译:

稀疏数据对偏远沉积盆地的地热资源评估:从加拿大安蒂科斯蒂岛汲取的经验教训

Anticosti岛位于Anticosti沉积盆地中,这是奥陶纪/ Si陵碳酸盐岩台地。该平台主要由石灰岩和页岩以及一些白云岩和砂岩组成,在西南部达到5 km的深度。它覆盖了由岩浆和变质岩构成的格伦维尔省前寒武纪基底。像加拿大大多数偏远和无电地区一样,它在很大程度上依赖于化石燃料来提供能源。对这一地区的深层地热资源进行了评估,目的是使能源资源多样化,以帮助为微电网系统应得的村庄开发可再生能源。尽管井底数据稀疏且质量低下(15口深度为1111 m至2762 m的井),针对该沉积盆地及其下的前寒武纪地下室,开发了3D温度模型,直至40 km(地幔深度)。量化热参数的置信区间(即井底温度,导热系数,产热率和地幔热通量)对于获得可靠的温度预测范围至关重要。试图限制输入参数时,模拟温度的高变化性最高,沉积盆地底部高达41%,地幔深度高达70%。缺乏平衡温度测量值会影响沉积盆地和前寒武纪地下室的温度预测。这是需要进一步研究解决的重要问题。此外,对格伦维尔省前寒武纪地下室的热学性质及其几何形状的了解很差。此外,安提科斯蒂沉积盆地中特定岩性的热导率存在较大的置信区间。它对深处的温度预测有重大影响,应将其改进以用于电力生产的研究。尽管对温度的预测存在较大的置信区间,但在当前的技术和经济环境下,要在120°C或更高的温度下从储层中产生地热发电似乎很困难。在2-4 km的水库深度下,可以在70°C的进口温度下实现低温发电,但净效率为10-11%(考虑到40 ls-1的流量和冷却温度) 5°C)。从沉积盆地最深处直接利用地热似乎是最现实的选择,
更新日期:2020-01-27
down
wechat
bug