[profile53]

That is incorrect. Somewhere in the order of 90% of US nat gas is shale gas/fracking related.

https://www.eia.gov/energyexplained/natural-gas/where-our-na...

[pfdietz]

Yes. And most of that is not associated with petroleum. It's fracking of formations that contain only natural gas, no petroleum. Fracking is also used on oil-bearing formations, but not only there.