Marine gas hydrate is electrically resistive compared to hydrate-free formations. This property is exploited in borehole logging and in marine controlled-source electromagnetic (CSEM) surveys to identify hydrate-bearing geologic layers. Well logging shows that hydrate can be electrically anisotropic, with vertical resistivities up to 10 times higher than horizontal resistivities. However, the use of logging tools capable of measuring electrical anisotropy is the exception rather than the rule. Marine CSEM surveying methods, on the other hand, are known to be sensitive to electrical anisotropy in seafloor sediments. For example, we have observed anisotropies of more than an order of magnitude using CSEM to map offshore relict permafrost. FIRE IN THE ICE METHANE HYDRATE NEWS
[1]
Alexey Portnov,et al.
Submarine Landslides Induce Massive Waves in Subsea Brine Pools
,
2019,
Scientific Reports.
[2]
F. Gross,et al.
Submarine slope failures due to pipe structure formation
,
2018,
Nature Communications.
[3]
Steven Constable,et al.
Vulcan: A deep‐towed CSEM receiver
,
2016
.
[4]
M. Lee,et al.
Gulf of Mexico Gas Hydrate Joint Industry Project Leg II logging-while-drilling data acquisition and analysis
,
2012
.