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作 者:谢健[1,2] 张可霓[1] 王永胜 覃莉清 郭朝斌[4]
机构地区:[1]北京师范大学水科学研究院,北京100875 [2]贺州学院建筑工程学院,广西贺州542899 [3]神华鄂尔多斯煤制油分公司,内蒙古鄂尔多斯017209 [4]同济大学机械工程学院,上海201804
出 处:《岩土力学》2016年第1期166-174,184,共10页Rock and Soil Mechanics
基 金:国家能源应用技术研究及工程示范项目(No.NY20111102-1);国家科技支撑计划项目(No.2011BAC08B00)~~
摘 要:中国首个陆上咸水层CO_2地质封存全流程示范项目于2010年正式实施。为更加清晰、准确地了解注入场地储层的注入性能和注入封存过程中可能遇到的潜在问题,基于场地储层结构和注入监测数据,采用储层多相流模拟软件TOUGH2-MP/ECO_2N对鄂尔多斯105 t/a CO2注入1 620 m以深的特低渗砂岩咸水含水层进行数值模拟,对储层的压力积聚和CO2羽体扩散的动态演化以及储层封存量进行评估。结果表明,所建立的模型比较准确地反映了实际注入过程和注入效果。3a注入引起的最大压力抬升小于15 MPa,CO2在含水层中总体呈均匀扩散,CO_2注入地下3a和53a后,羽体在刘家沟储层中的横向迁移距离分别为550 m和700 m左右。在目前的统注方案下,CO_2主要封存层位在储层上部的刘家沟组(埋深为1 690~1 699 m),其吸气量占整个储层封存量的80%以上,储层吸气能力具有由浅到深变差的特征。53a模拟期内,进入泥岩盖层的CO_2总量不及注入总量的0.05%。A full-chain carbon capture and storage(CCS) demonstration project was implemented in 2010 by injecting 105 tons of super-critical CO2 per annum down into the brine-saturated low-permeability sandstone and carbonate aquifers at depths of more than 1 620 m in the northeastern Ordos Basin, China. Based on the site-specific geology and the observational data, a numerical injection model is developed based on TOUGH2-MP/ECO2 N to simulate the on-going injection process and hence evaluate the injection-induced behavior of the multiphase flow system in the reservoirs. The pressure build-up and the dynamics of the CO2 saturation plume are assessed. The results show that the model developed can reproduce well the performance of the storage reservoir. The CO2 plume spreads outward symmetrically in the horizontal plane. The Liujiagou sandstone aquifer is the most favorable reservoir for CO2 storage at this site. After 3 years of consecutive injection of CO2, the CO2 plume front in the Liujiagou unit is located at about 550 m in 3 years after the commencement of the injection. The pore pressure buildup due to injection is slightly less than 15 MPa. The plume in the Liujiagou unit is expected to migrate to around 700 m away from the injection well after 53 years of post-injection. The major storage reservoir is at the depth interval 1690-1699 m, which contributes over 80% of the storage capacity of the entire reservoir system. The contribution of the reservoirs to the total storage capacity descreases with the depth downward. The leakage of CO2 into the seals is negligible(〈0.05%) during the 53 years of simulation period.
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