Carbon sequestration potential of the Habanero reservoir when carbon dioxide is used as the heat exchange fluid

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• 作者：Chaoshui Xu^a ; ^{chaoshui.xu@adelaide.edu.au" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Peter Dowd^aAuthor Vitae ; Qi Li^bAuthor Vitae
• 关键词：Carbon sequestration ; Carbon dioxide (CO2) geological storage capacity ; Enhanced geothermal system (EGS) ; CO2-EGS ; Habanero project
• 刊名：Journal of Rock Mechanics and Geotechnical Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：8
• 期：1
• 页码：50-59
• 全文大小：1754 K

文摘

The use of sequestered carbon dioxide (CO₂) as the heat exchange fluid in enhanced geothermal system (EGS) has significant potential to increase their productivity, contribute further to reducing carbon emissions and increase the economic viability of geothermal power generation. Coupled CO₂ sequestration and geothermal energy production from hot dry rock (HDR) EGS were first proposed 15 years ago but have yet to be practically implemented. This paper reviews some of the issues in assessing these systems with particular focus on the power generation and CO₂ sequestration capacity. The Habanero geothermal field in the Cooper Basin of South Australia is assessed for its potential CO₂ storage capacity if supercritical CO₂ is used as the working fluid for heat extraction. The analysis suggests that the major CO₂ sequestration mechanisms are the storage in the fracture-stimulation damaged zone followed by diffusion into the pores within the rock matrix. The assessment indicates that 5% of working fluid loss commonly suggested as the storage capacity might be an over-estimate of the long-term CO₂ sequestration capacity of EGS in which supercritical CO₂ is used as the circulation fluid.