[The Cajun]

The liquefied gas in the storage well is not under high pressure, the danger occurs if the salt dome holding it collapses and it's released to the surface all at once.
It actually needs to be pumped out.
Don't know the pressures from the small naturally occurring gas pockets in the area or parts per million of H2S involved.
An area 10-12 miles away has lots of H2S gas pockets.
Hindsight says this wasn't the best place for Texas Brine to be working in or for damn sure the storage outfit that was storing liquefied gas in the dome next to it.

[Blogger]

The well that contains the butane had some unusual seismic activity around the 28th, as if something was falling.

Hopefully that is not indicative of any sort of a faillure. But I agree, they need to pump the butane out of that well.

http://folkworm.ceri.memphis.edu/heli_temp/