Gravity currents of carbon dioxide with residual gas trapping in a two-layered porous medium
Gravity currents of carbon dioxide with residual gas trapping in a two-layered porous medium
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DOI：
10.1017/s0022112010006178
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发表时间：
2011-02
影响因子：
3.7
通讯作者：
T. Goda;Kozo Sato
中科院分区：
文献类型：
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作者：
T. Goda;Kozo Sato
在CO2的地质封存中，残余气体的捕获在固定CO2方面起着重要作用。在这项研究中，我们研究了重力流的传播与残留气体捕获在一个两层多孔介质。首先，我们制定了一个模型，从一个点源到多孔介质的恒定通量释放相对较低密度的流体（CO2）的水平渗透性较低的密封界定以上。在恒定流量释放停止后，由于毛细力，一部分释放的流体保留在后缘处的多孔空间内。这种毛细保留制定在一个模型中的重力流的有限体积释放的两层介质。在后一种模型中，在恒定通量释放结束时的羽流形状被用作初始轮廓。依次使用这些模型，横截面和轴对称电流的传播进行定量研究。
In the geological sequestration of carbon dioxide (CO2), residual gas trapping plays an important role in immobilizing CO2. In this study, we investigate the propagation of gravity currents with residual gas trapping in a two-layered porous medium. We first formulate a model for a constant-flux release of a relatively less dense fluid (CO2) from a point source into a porous medium bounded above by a horizontal less-permeable seal. After a constant-flux release ceases, a fraction of the released fluid remains within the porous spaces at the trailing edge because of the capillary forces. This capillary retention is formulated in a model of gravity currents of a finite-volume release in the two-layered medium. In the latter model, the plume shape at the end of the constant-flux release is used as an initial profile. Using these models sequentially, the propagation of both cross-sectional and axisymmetric currents is quantitatively examined.