I suppose I've never paid much attention to how natural gas deposits were located offshore, but this makes sense.
The environmental question concerns me also. As someone who saw first hand the destruction of the Deepwater Horizon spill in 2010, I am leery of many methods that were previously thought to be safe, but are actually quite destructive.
Obviously, seismic testing is crucial for earthquake prediction and detection, but I would urge caution for its use in detecting natural gas deposits. This old ball of dirt is the only one we've got, and I think we need to be responsible stewards.