I strongly doubt the Marcellus drilling has anything to do with your water intrusion problem. The fracking is occurring about 1 mile to 2 miles deep and never affects ground water. From what I have read, there IS some coal bed gas deposits that are pretty shallow in Pennsylvania, but not commercial in quantities like the horizontal Marcellus wells and certainly the Marcellus wells are WAY deeper than can affect ground water with fracking. Also typically the frack radius away from the horizontal wellbore is only a couple of hundred feet.
Yes in the Permian, we are producing so much gas in our OIL wells, we have swamped the gas pipeline infrastructure. Producers have had to PAY for the pipelines to take their gas instead of the other way around. There is a lot of flaring out here because the price of the gas is so bad or none existent.
We produce casinghead gas along with the oil that we can get a decent price for so we take it in the shorts on the gas. We can’t just not produce the gas or shut in the gas because it comes MIXED WITH a butt load of crude oil, the comparatively reasonably priced commodity that we have in prolific quantities.