Evaluation of large-scale CO2 storage on fresh-water sections of aquifers: An example from the Texas Gulf Coast Basin
Evaluation of large-scale CO2 storage on fresh-water sections of aquifers: An example from the Texas Gulf Coast Basin
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DOI：
10.1016/j.ijggc.2008.03.004
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发表时间：
2008-10
影响因子：
3.9
通讯作者：
J. Nicot
中科院分区：
文献类型：
--
作者：
J. Nicot
有人提议将CO2大规模注入地下咸水层，以补救与大气中绿色温室气体积累有关的气候变化。这种注入造成的压力增加可能会影响盆地的体积，远远大于CO2羽流本身。在水文环境类似于墨西哥湾沿岸盆地的地区，盆地深处流场的扰动可能导致盐水或微咸水被向上推动，进入相同地层的无压部分或进入淡水威尔斯井的捕获区。当前研究的前提是，模拟二氧化碳羽流近场演变所需的多相流动过程的细节对于描述压力异常对上倾含水层的影响来说是不必要的。本文定量探讨条件下，浅层地下水会受到向上倾斜位移的盐水，利用现有的仔细校准的流动模型。模拟注入水，可以说相当于50年5000万吨二氧化碳/年，导致平均地下水位上升10.1米，河流基流略有增加，地下水蒸散量增加较大，但盐度没有显着变化。
Large-scale injections of CO2into subsurface saline aquifers have been proposed to remediate climate change related to buildup of green house gases in the atmosphere. The pressure buildup caused by such injections may impact a volume of the basin significantly larger than the CO2plume itself. In areas with hydrological settings similar to the Gulf Coast Basin, the perturbation of the flow-field in deep parts of the basin could result in brines or brackish water being pushed up-dip into unconfined sections of the same formations or into the capture zone of fresh-water wells. The premise of the current study is that the details of multiple-phase flow processes necessary to model the near field evolution of the CO2plume are not necessary to describe the impact of the pressure anomaly on up-dip aquifers. This paper quantitatively explores conditions under which shallow groundwater would be impacted by up-dip displacement of brines, utilizing an existing carefully calibrated flow model. Modeling an injection of water, arguably equivalent to 50 million tons of CO2/year for 50 years resulted in an average water-table rise of ∼1m, with minor increase in stream baseflow and larger increase in ground water evapotranspiration, but no significant change in salinity.