深水沉积物中甲烷气泡的非Fickian扩散和聚集
Non-Fickian Diffusion and the Accumulation of Methane Bubbles in Deep-Water Sediments
摘要：
在没有裂缝的情况下，深水沉积物中的甲烷气泡可以通过表面张力被固定地捕获在多孔基质中。因此，气体质量转移的主要机制变成气体分子通过孔隙水的扩散。这个过程的准确描述需要考虑非菲克扩散，包括热扩散和引力作用。我们评估的扩散通量的含水甲烷考虑非菲克扩散和预测存在广泛的气泡质量积累区内深水沉积物。揭示了水合物沉积能力的局限性;太弱的沉积物不能到达水合物稳定带的底部并形成任何气泡层。
英文摘要：
In the absence of fractures, methane bubbles in deep-water sediments can be immovably trapped within a porous matrix by surface tension. The dominant mechanism of transfer of gas mass therefore becomes the diffusion of gas molecules through porewater. The accurate description of this process requires non-Fickian diffusion to be accounted for, including both thermodiffusion and gravitational action. We evaluate the diffusive flux of aqueous methane considering non-Fickian diffusion and predict the existence of extensive bubble mass accumulation zones within deep-water sediments. The limitation on the hydrate deposit capacity is revealed; too weak deposits cannot reach the base of the hydrate stability zone and form any bubbly horizon.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
