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评估CO2地质封存潜力以及选择优势靶区是咸水层CO2地质封存的关键，当前CO2地质封存潜力评价方法复杂、参数获取难度大且选址方法多样、选址指标尚不统一。利用钻井、测井、录井、完井等资料对榆林神木(以下简称榆神)地区二叠系上统石千峰组至三叠系上统延长组地层开展地层划分与对比、岩性、物性解释等工作，识别出榆神地区最适合CO2地质封存的咸水层，即上三叠统延长组长10＿3亚段咸水层。根据地下咸水层展布特征，利用容积法完成该层封存潜力评价，结合榆神地区地面环境状况，实现地下+地面综合选址并提出影响选址的7个重要评价指标。最后基于靶区优选区块，开展了层次分析法和模糊综合评价法的靶区评价及排序。研究表明：长10＿3亚段平均孔隙度9.40%、渗透率1.09 mD、咸水层平均厚度37 m,封存潜力约5.14×108 t,所圈定的区块A4是最适合CO2地质封存的优质靶区，具备优先开展CCS项目的条件，可为周边高碳排放企业就近实施CCS项目提供选址及潜力评价的指导。
Abstract：Assessing the potential of CO2 geological storage and selecting advantageous targets are the key to the geological storage of CO2 in saline aquifers. At present, the evaluation methods of CO2 geological storage potential are complex, the parameters are difficult to obtain, the site selection methods are diverse, and the site selection indicators are not uniform.In this paper, the stratigraphic division and correlation, lithology and physical property interpretation of the Upper Permian ShiQianFeng formation to the Upper Triassic YanChang formation in YuLin-ShenMu area(Hereinafter referred to as “YuShen” area) have been carried out by using drilling, logging and well completion data, the Saline aquifer of Chang 10＿3 sub-member of YanChang formation of Upper Triassic is the most suitable for CO2 geological storage in YuShen area. According to the distribution characteristics of underground Saline aquifer, the storage potential of it is evaluated by using the volumetric method, combined with the surface environment conditions of YuShen area, the paper realizes the comprehensive site selection of underground+ground and puts forward 7 important evaluation indexes that affect the site selection.Finally, based on the target optimization block, the evaluation and ranking of target area are carried out by AHP+Fuzzy mathematics comprehensive evaluation method.The results show that the average porosity of the Chang 10＿3 sub-member is 9.40%, the permeability is 1.09mD, the average thickness of the saline aquifer is 37m, and the storage potential is about 5.14×108 t. The delineated block A4 is the most suitable high-quality target area for CO2 geological storage, which has the conditions to give priority to CCS projects, and can provide guidance for site selection and potential evaluation for surrounding high-carbon emission enterprises to implement CCS projects nearby.
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基本信息:
DOI：10.16152/j.cnki.xdxbzr.2025-05-009
中图分类号:P642.5;X701
引用信息:
[1]丁钊,王浩璠,马劲风,等.榆神地区长10＿3亚段咸水层CO_2地质封存潜力评价及靶区优选[J].西北大学学报(自然科学版),2025,55(05):1049-1064.DOI:10.16152/j.cnki.xdxbzr.2025-05-009.
基金信息:
国家自然科学基金(42304119); 陕西省自然科学基础研究计划项目(2021JCW-04,2022JC-DW-09,2024JC-DXWT-06); 陕西省重点产业创新链项目(2023-ZDLSF-64); 陕西省厅市联动重点项目(2022GD-TSLD-45)