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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 CO_2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CO_2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,CO_2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%。
China’s first onshore brackish water CO 2 geological seal of the whole process of demonstration projects formally implemented in 2010. In order to understand the injection performance and the potential problems in the process of injecting and injecting reservoirs more clearly and accurately, based on the reservoir structure and injection monitoring data, the reservoir multiphase flow simulation software TOUGH2-MP / ECO_2N Ordos 105 t / a CO_2 was injected into the deep seawater of 1 620 m depth to simulate the pressure accumulation in the reservoir and the dynamic evolution of CO 2 plume diffusion and the storage of reservoirs. The results show that the model established reflects the actual injection process and injection effect more accurately. The maximum pressure rise caused by the injection of 3 a was less than 15 MPa, and the CO 2 diffused uniformly in the aquifer. After the injection of CO 2 into underground subsurface 3a and 53a, the lateral migration distances of the plume in Liujiagou reservoir were 550 m and 700 m, respectively . Under the current scheme, the main CO 2 sequestration reservoir is located in the Liujiagou Formation (1690 ~ 1699 m in depth) in the upper part of the reservoir, which accounts for more than 80% of the total reservoir volume. The layer gettering ability has the characteristic of being shallow to deep. During the simulation period of 53a, the total amount of CO 2 entering the mudstone cover is less than 0.05% of the total injected amount.