Base of hydrate stability zone for biogenic gas. Geographical site: SW Europe. Reference: Váquez-Izquierdo, A., Gimenez-Moreno, C.-J., León, R., 2018. Knowledge gaps in gas-hydrate assessment: theoretical considerations and practical implications. Geophysical Research Vol. 20, EGU2018-12847, 2018EGU General Assembly 2018 (Vol. 20, EGU2018-12847, 2018EGU General Assembly 2018).

Base of negative bouyancy zone for 100% C02. Geographical site: Celtic Sea & French EEZ. References: Burnol, A. (2018). Roles of Gas Hydrates for CO2 Geological Storage Purposes. Gas Hydrates 2, 267-284. doi:https://doi.org/10.1002/9781119451174.ch13 Burnol, A., Thinon, I., Ruffine, L., & Herri, J. M. (2015). Influence of impurities (nitrogen and methane) on the CO2 storage capacity as sediment-hosted gas hydrates – Application in the area of the Celtic Sea and the Bay of Biscay. International Journal of Greenhouse Gas Control, 35, 96-109. doi:https://doi.org/10.1016/j.ijggc.2015.01.018

Geophysical indicators for gas hydrate. Data are represented as points.

Seafloor features that are indicators for fluid flow. Represented as points

Gas analyses produced by IODP The International Ocean Discovery Program

Geophysical indicators for gas hydrate. Line data.

Base of negative bouyancy zone for 96% C02. Geographical site: Celtic Sea & French EEZ. References: Burnol, A. (2018). Roles of Gas Hydrates for CO2 Geological Storage Purposes. Gas Hydrates 2, 267-284. doi:https://doi.org/10.1002/9781119451174.ch13 Burnol, A., Thinon, I., Ruffine, L., & Herri, J. M. (2015). Influence of impurities (nitrogen and methane) on the CO2 storage capacity as sediment-hosted gas hydrates – Application in the area of the Celtic Sea and the Bay of Biscay. International Journal of Greenhouse Gas Control, 35, 96-109. doi:https://doi.org/10.1016/j.ijggc.2015.01.018

Base of negative bouyancy zone for 96% C02. Geographical site: South of Biscay Bay, Galicia Area. References: Burnol, A. (2018). Roles of Gas Hydrates for CO2 Geological Storage Purposes. Gas Hydrates 2, 267-284. doi:https://doi.org/10.1002/9781119451174.ch13 Burnol, A., Thinon, I., Ruffine, L., & Herri, J. M. (2015). Influence of impurities (nitrogen and methane) on the CO2 storage capacity as sediment-hosted gas hydrates – Application in the area of the Celtic Sea and the Bay of Biscay. International Journal of Greenhouse Gas Control, 35, 96-109. doi:https://doi.org/10.1016/j.ijggc.2015.01.018

Geological/geochemical evidences of gas hydrate. Represented as polygons.

Information about the heat flow and geothermal gradient represented as points. The data originally come from the global heat flow database of the International Heat Flow Commission in 2010. A description of the data and a literature list can be found on the website of the International Heat Flow Commission (https://ihfc-iugg.org/products/global-heat-flow-database)