【摘要】 咸水层二氧化碳（CO₂）地质封存为达成碳中和目标的重要储备技术，筛选适宜的封存层系为咸水层CO₂地质封存工程选址的前提。笔者等以鄂尔多斯盆地东北部高碳排放地区为例，深入分析了4个潜在封存储盖组合的地质特征，并基于封存潜力、封存安全、经济及工程适宜性3个准则，建立了14个咸水层CO₂地质封存优选指标，利用熵权法分析了不同指标的权重，并基于TOPSIS法（Technique for Order Preference by Similarity to Ideal Solution,优劣距离法）进行了最终封存层系优选。计算结果表明14个优选指标权重在4.26%到12.95%,其中盖层厚度指标权重最大，储层埋深、储层渗透率和资源开发冲突次权重相对较高；TOPSIS法排序打分结果表明，中、上储盖组合的石千峰组及纸坊组最适宜鄂尔多斯盆地东北部进行CO₂咸水层地质封存，应作为平面选址及后续咸水层CO₂地质封存工程的优选层系。更多还原

【Abstract】 Objectives: Saline aquifer CO₂ geological storage is an important reserve technology for achieving carbon neutrality. Screening suitable formation is a prerequisite for site selection in saline aquifer CO₂ geological storage projects. The northeastern part of the Ordos Basin,a high carbon emission area,was taken as a case study.Methods: The geological characteristics of four potential storage reservoir—cap combinations was analyzed.Based on the three criteria of storage potential,safety and economic,and engineering suitability,14 screening indicators were established for saline aquifer CO₂ geological storage. The entropy weight method was used to determine the weights of the indicators,and the final screening was conducted using the TOPSIS method.Results: The analysis results shows that the weights of the 14 screening indicators range from 4. 72% to 13. 29%,among them, cap thickness has the highest weight, followed by reservoir burial depth, reservoir permeability,caprock breakthrough pressure,and cumulative reservoir thickness,which also carry relatively high weights. The ranking scores derived from the TOPSIS method indicate that the middle and upper storage reservoircap combinations is the most suitable for saline aquifer CO₂ geological storage in the northeastern part of the Ordos Basin. Conclusions: The middle and upper storage reservoir-cap combinations should be selected as the target for planar site selection and subsequent optimization of formations for saline aquifer CO₂ geological storage projects.更多还原