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

Geophysical indicators for gas hydrate. Polygons.

Geological/geochemical evidences of gas hydrate. Represented as polygons. Data from A.P. Karpinsky Russian Geological Research Institute

Geophysical indicators for gas hydrate. Data from MIGRATE. Data are represented as polygons.

Base of hydrate stability zone for 96% CO2. 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

Base of hydrate stability zone for 96% CO2. 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 hydrate stability zone for 100% CO2. 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 hydrate stability zone for biogenic gas. Geographical site: world. Reference: Piñero, E., Marquardt, M., Hensen, C., Haeckel, M., & Wallmann, K. (2013). Estimation of the global inventory of methane hydrates in marine sediments using transfer functions. Biogeosciences (BG), 10(2), 959-975.

Density map of hydrate evidence (samples of hydrates in gravity cores or wells) and indicators (seismic anomalies or geochemical indicators). It has been developed with the “point density” algorithm of ArcGIS®. Pixel value, number of data per 100,000 km2. Parameters: population field, none; cell size, 5000; radius, 178,415 metres; areal units, square kilometres; method, geodesic. Knowledge gap, raster value < 1 Reference: https://doi.org/10.3390/app11062865

Geophysical indicators for gas hydrate. Line data.