Multi-scale modeling of CO2 dispersion leaked from seafloor off the Japanese coast

作者：Kano Yuki; Sato Toru^*; Kita Jun; Hirabayashi Shinichiro; Tabeta Shigeru

来源：Marine Pollution Bulletin, 2010, 60(2): 215-224.

DOI：10.1016/j.marpolbul.2009.09.024

• Subsea geological storage of CO2
• Leakage of CO2
• Two-phase flow
• Dissolution of CO2
• Multi-scale ocean model

A numerical simulation was conducted to predict the change Of pCO(2) in the ocean caused by CO2 leaked from an underground aquifer, in which CO2 is purposefully stored. The target space of the present model was the ocean above the seafloor. The behavior of CO2 bubbles, their dissolution, and the advection-diffusion of dissolved CO2 were numerically simulated. Here, two cases for the leakage rate were studied: an extreme case, 94,600 t/y, which assumed that a large fault accidentally connects the CO2 reservoir and the seafloor; and a reasonable case, 3800 t/y, based on the seepage rate of an existing EOR site. In the extreme case, the calculated increase in Delta pCO(2) experienced by floating organisms was less than 300 ppm, while that for immobile organisms directly over the fault surface periodically exceeded 1000 ppm, if momentarily. In the reasonable case, the calculated Delta pCO(2) and pH were within the range of natural fluctuation.

• 出版日期2010-2