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Updated: Nov 28, 2025
08:46
Methane Hydrate Crystallization on Sessile Water Droplets
Published on: May 26, 2021
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Crustal fingering facilitates free-gas methane migration through the hydrate stability zone.
Xiaojing Fu1,2, Joaquin Jimenez-Martinez3,4,5, Thanh Phong Nguyen4
1Department of Earth and Planetary Science, University of California, Berkeley, CA 94670; rubyfu@caltech.edu juanes@mit.edu joaquin.jimenez@eawag.ch.
Summary
Scientists studied how methane gas moves through ocean sediments where methane hydrate forms. They discovered a new process called "crustal fingering" that helps explain methane migration in these deep-sea environments.
Area of Science:
- Geochemistry
- Marine Geology
- Geophysics
Background:
- Seafloor methane venting is widespread, but quantifying methane release is a challenge for climate assessment.
- Methane hydrate forms in deep marine settings (hydrate stability zone, HSZ) and coexists with methane seepage.
- Existing theories on gas migration don't fully explain processes within the HSZ where hydrates form.
Purpose of the Study:
- To investigate the mechanics of gas percolation under conditions where methane hydrate forms.
- To develop a theoretical mechanism for methane migration involving hydrate formation.
- To understand the role of hydrate formation in gas percolation within the HSZ.
Main Methods:
- Experimental study of gas percolation under hydrate-forming conditions.
- Computational modeling of gas migration mechanics.
- Analysis of methane-gas migration in ocean sediments within the HSZ.
Main Results:
- Discovery of a phenomenon termed 'crustal fingering'.
- Demonstration that crustal fingering controls methane-gas migration in HSZ sediments.
- Uncovering a missing theoretical mechanism for gas percolation involving hydrate formation.
Conclusions:
- Crustal fingering is a key process governing methane migration in hydrate-bearing marine sediments.
- This finding addresses a critical gap in understanding deep-sea methane release.
- Improved understanding aids in assessing the global carbon budget and predicting climate change.
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