CO2 sequestration with limited sealing capability: A new injection and storage strategy in the Pearl River Mouth Basin (China)
CO2 sequestration with limited sealing capability: A new injection and storage strategy in the Pearl River Mouth Basin (China)
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DOI：
10.1016/j.ijggc.2017.11.009
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发表时间：
2018-01-01
影响因子：
3.9
通讯作者：
Scott, Vivian
中科院分区：
文献类型：
--
作者：
Heinemann, Niklas;Haszeldine, R. Stuart;Scott, Vivian
在地质时间尺度上储存二氧化碳对于实现符合全球气候变化减缓目标的工业经济体脱碳至关重要。这需要将CO2注入到由高毛细管进入压力密封岩石覆盖的大的地下孔隙空间中，以防止CO2逸出。此类地层大量存在于北海等多产碳氢化合物盆地中。然而，这些地质条件的CO2封存在中国的一些大型CO2排放的经济区附近是不具备的。我们发现了这个问题，并以珠江口盆地（中国）为例创新了解决方案。根据储层孔隙体积，该近海盆地的有效储存容量估计为数百Gt CO2。惠州油气群的三个油田的生产和地质数据进行了分析，作为大规模含水层储存CO2的类比。结果表明，注入和储存的CO2在个别圈闭结构将执行差，由于薄的储层，小的构造圈闭，盖层可能只有有限的密封能力的迹象。为了解决这个问题，一种新的替代CO2封存策略，基于多储层注入和分散捕集，建议利用巨大的可用孔隙空间CO2存储。
Storing CO2 for geological timescales is crucial to delivering decarbonisation of industrial economies aligned with global climate change mitigation objectives. This requires CO2 injection into a large subsurface pore space overlain by a high capillary entry pressure seal rock to prevent CO2 escape. Such formations occur abundantly in productive hydrocarbon basins such as the North Sea. However, these geological conditions for CO2 storage are unavailable close to some large CO2 emitting economic areas in China. We identify this problem and innovate a solution for the example of the Pearl River Mouth Basin (China). This offshore basin has an estimated effective storage capacity of hundreds of Gt CO2 based on reservoir pore volumes. Production and geological data of three oil fields of the Huizhou hydrocarbon cluster are analysed as analogues for large-scale aquifer storage of CO2. Results suggest the injection and storage of CO2 in individual trap structures will perform poorly, due to thin reservoir layers, small structural traps, and indications that the cap rocks may have only limited sealing capability. To address this a novel alternative CO2 sequestration strategy, based on multi reservoir layer injection and dispersion trapping, is recommended to exploit the vast available pore space for CO2 storage.