Evaluation methods of underground space utilization for CO2 geological storage in deep saline aquifers
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摘要: 咸水层CO2地质封存技术是我国实现碳中和目标的重要支撑技术,也是一项深部地下空间开发利用技术。咸水层CO2地质封存工程利用的深部地下空间,需要在确定CO2羽流、扰动边界和经济因素“三级边界”的基础上进行综合评估。以我国唯一的深部咸水层CO2地质封存项目——国家能源集团鄂尔多斯碳捕集与封存(Carbon Capture and Storage, CCS)示范工程为实例,基于封存场地储层CO2羽流监测以及扰动边界的推断预测结果综合评估,认为示范工程平面上4个1'×1'经纬度范围可作为地下利用空间平面边界,垂向上以纸坊组顶界(深度约958 m)为地下封存体顶部边界,以深度2 800 m为底板封隔层底界。提出的咸水层CO2地质封存地下利用空间评估方法,能够为未来封存工程地下利用空间审批与监管提供一定参考,但也需要进一步结合已有法律法规及规模化封存工程实践完善提升。Abstract: CO2 geological storage in deep saline aquifers is an important supporting technology to achieve the goal of carbon neutrality in China, and it is also a technology of deep underground space development and utilization. The deep underground space for CO2 geological storage in deep saline aquifers should be comprehensively evaluated on the basis of three-level boundaries, including CO2 plume, perturbation boundary and economic condition. In this paper, the only deep saline aquifers storage project in China—the Ordos CCS demonstration project of National Energy Group have been taken as a case study. Based on the monitoring of CO2 plume at the storage site and the prediction of perturbation boundary and the prediction of perturbation boundary, the authors have comprehensively affirmed that the 4 basic units of latitude 1' × longitude 1' of the project could be utilized as the boundary of CCS demonstration project. While the top of Zhifang Formation (about 958 m in depth) could be the top boundary, and the seal depth of 2 800 m is the bottom boundary of storage body in vertically. The method of developing deep underground space for CO2 geological storage, proposed in this paper could provide references for the scientific planning and policy enacting in management. However, this method still needs to be further improved in combination with the existing laws and regulations and the future practice of large-scale storage projects.
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