Gas Fracking: Good or Bad? Depends!

Recent news reports published by the internet news services tell how the EPA is seriously investigating complaints related to natural gas fracking (hydro-fracturing) near Pavillion, Wyoming. Those complaints include contamination of water supplies by methane and by toxic fracking chemicals.

I looked up the geography and geology of Pavillion: it lies in the western half of Wyoming, a region dominated by the Rocky Mountains. There will be sediments in the basins, but the fundamental underlying geology is contorted and fractured mountain zone rock.

As a result, I am entirely unsurprised that both natural gas and fracking chemicals are finding their ways into the groundwater. I am surprised that how this can be, is a still a matter of legal debate.

I am no geologist, but even I can understand what is happening, and how, and I published it as a guest column in the Waco Tribune Herald last May. Here is the original submitted text for that column, with some emphasis added now:

Coming Even Cleaner on Fracking” (submitted 5-26-11/published 5-28-11)

The “Trib’s” editors recently ran a very nice editorial on the controversy surround the process of “fracking” (short for “hydraulic fracturing”) for natural gas in shale. This article neatly laid out the two sides of the public debate, which is centering mainly on whether or not there are undesirable side effects.

I find it very interesting that the studies are "still inconclusive", seeing as how the field data is very indicative of what actually happens. It's not a simple either-or situation, it’s geology-dependent, and this is completely left out of the current public debates.

Here in Texas and nearby states, the rock layers are old seabed sediments, more or less level, and are relatively intact. Few paths exist across these layers for oil and gas to migrate upward. That is why fracking has few side effects in this part of the country. The most notable exception has been very minor earthquake tremors induced from the disposal of used fracking fluids by deep well injection.

In Pennsylvania and the other states in the Appalachian mountain zone, there have been widespread complaints about natural gas getting into groundwater, leading to fire and explosion incidents when turning on the water tap. These are real incidents, and are easy to understand if one simply looks at the geology below the surface.

In a mountain zone, the rock layers are highly contorted, fractured, and thoroughly broken-up. There are many paths for oil, and especially the far-more-mobile gas, to migrate to the surface. It is entirely unsurprising, and in fact quite predictable, that this very mobile gas, once released from a deep shale, should migrate upward and contaminate near-surface water supplies. It does so by dissolving into the water under earth pressures, similar to a carbonated beverage.

The solution to the exploding kitchen faucet problem is simple: fracking for gas is OK in continuous-layered sea bottom sediment zones, but not OK in highly-fractured mountainous zones. So, we don't frack there, period. Those gas deposits await a still-undiscovered recovery technology with fewer side effects, more suited to that kind of geology.

This does mean that the agencies regulating gas leases actually do have to regulate, and sometimes to deny permits, unaccustomed as they apparently are to such activities.

The processes of fracking and fracking-fluid disposal were specifically exempted from EPA regulation under the Clean Water Act. This happened in that secretive energy company meeting at the White House during the last administration. It is known as the Halliburton exemption.

However, the injection of diesel fuel into the earth is actually still regulated. While fracking fluid is mostly water plus a little sand or glass beads, the most common liquid trace additive in all these "secret" recipes is diesel fuel. If those recipes were widely revealed, the use and disposal of these fluids would come under direct EPA regulation again, meaning only that they take a little better care doing what they already do.

In that event, fracking for gas would still be quite profitable, just not quite as much as it is without any regulation at all. But fewer folks suffer the side effects, and that’s a good thing.