What's it like inside a natural gas cavern on Earth?

Question

I suppose natural gas underground caverns on Earth have substantial volume and gas is in gaseous form there.As such I wonder how it would look like inside such cavern (with artificial light of course). Will one see a rocky sky at big distance?What is the actual volume of such caverns? It is correct to talk about methane oceans or seas?Are they empty or the gas is mixed up with solid substance?

Answer 1

So, usually natural gas is not found in a large underground chamber. Its usually contained in tiny pores in shales, which is why we frack to get it out. Sometimes in some swamps you can have large salt deposits trapping gas in a larger cavern, but even then it wont be very large.

If there was a cavern filled with natural gas, it would probably look like most other caves, whether its salt or a karst if you shown a light into it. The air would just be flammable.