Tinivella Umberta, Giustiniani Michela
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS, 34010, Trieste, Italy.
Sci Rep. 2025 Jul 11;15(1):25161. doi: 10.1038/s41598-025-10802-8.
Hydrates have recently come to the forefront because of their importance for the environmental impact and subsurface exploration. However, the conditions that affect their stability, particularly in the marine environment, are not yet fully understood. This study presents a static model on a global scale to assess CO hydrate stability. This analysis allowed evaluating the effects of salinity, sea water depth and geothermal gradient changes on CO hydrate stability also taking into account the thickness of the porous media. The results indicate that shallow water depth and low geothermal gradient favour the formation of CO hydrates. Furthermore, this modelling suggests that the actual salinity values rather than assuming constant values significantly improves the accuracy of stability predictions. A focus analysis was performed in the polar regions, where environmental conditions are most favourable for CO hydrate formation. The results provide a comprehensive global understanding of CO hydrate formation and optimal conditions, facilitating future local-scale applications.
由于水合物对环境影响和地下勘探的重要性，它们最近已成为研究的前沿热点。然而，影响其稳定性的条件，尤其是在海洋环境中的条件，尚未得到充分了解。本研究提出了一个全球尺度的静态模型，以评估一氧化碳水合物的稳定性。该分析能够评估盐度、海水深度和地热梯度变化对一氧化碳水合物稳定性的影响，同时还考虑了多孔介质的厚度。结果表明，浅海水深度和低地热梯度有利于一氧化碳水合物的形成。此外，该模型表明，实际盐度值而非假设的恒定值能显著提高稳定性预测的准确性。在极地地区进行了重点分析，那里的环境条件最有利于一氧化碳水合物的形成。研究结果提供了对一氧化碳水合物形成及其最佳条件的全面全球理解，便于未来在局部尺度上的应用。
