Carbon sequestration potential of the Habanero reservoir when carbon dioxide is used as the heat exchange fluid
Carbon sequestration potential of the Habanero reservoir when carbon dioxide is used as the heat exchange fluid
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DOI：
10.1016/j.jrmge.2015.05.003
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发表时间：
2016-02
影响因子：
7.3
通讯作者：
Chaoshui Xu;P. Dowd;Qi Li
中科院分区：
文献类型：
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作者：
Chaoshui Xu;P. Dowd;Qi Li
在增强型地热系统(EGS)中使用隔离二氧化碳(CO2)作为热交换流体具有显著的潜力，可以提高其生产率，进一步减少碳排放，并增加地热发电的经济可行性。热干岩(HDR)EGS耦合二氧化碳封存和地热能生产是15年前首次提出的，但尚未得到实际实施。本文回顾了评估这些系统的一些问题，特别关注发电和二氧化碳封存能力。采用超临界CO2作为取热工质，对南澳大利亚州库珀盆地哈巴内罗地热田潜在的CO2储热能力进行了评估。分析认为，CO2的主要固定机制是储存在裂缝刺激损伤带中，然后扩散到岩石基质中的孔隙中。评估表明，通常被认为是储存能力的5%的工作液损失可能高估了以超临界CO2为循环液的EGS的长期CO2封存能力。
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 CO2sequestration 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 CO2sequestration capacity. The Habanero geothermal field in the Cooper Basin of South Australia is assessed for its potential CO2storage capacity if supercritical CO2is used as the working fluid for heat extraction. The analysis suggests that the major CO2sequestration 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 CO2sequestration capacity of EGS in which supercritical CO2is used as the circulation fluid.