People in seven states, from South Dakota to Texas, were awakened Saturday morning, September 3, by Oklahoma’s most powerful earthquake in recorded history. The 5.8 tremor was centered near Pawnee, OK. Several buildings sustained minor damage and there were no serious injuries.
That we know. What we don’t know is what caused the quake—but that didn’t stop the alarmist headlines from quickly blaming it on “fracking.”
Green Party candidate Dr. Jill Stein promptly tweeted: “Fracking causes polluted drinking water + earthquakes. The #GreenNewDeal comes with none of these side effects, Oklahoma. #BanFracking”
Citing a March 2016 report from the U.S. Geological Survey (USGS) on “induced earthquakes,” CNN says: “The report found that oil and gas drilling activity, particularly practices like hydraulic fracturing or fracking, is at issue. Saturday’s earthquake spurred state regulators in Oklahoma to order 37 disposal wells, which are used by frackers, to shut down over a 725-square mile area.”
Despite these dramatic accusations, the science doesn’t support them. The USGS website clearly states: “Fracking is NOT causing most of the induced earthquakes.”
An important study from Stanford School of Earth, Energy & Environmental Sciences on the Oklahoma earthquakes, which I wrote about last year, makes clear that they are “unrelated to hydraulic fracturing.”
While the exact cause of the September 3 quake is still undetermined, geologists close to the research do not believe it is fracking related. (Realize 5.5 El Reno earthquake, centered near the western edge of Oklahoma City, in 1952 was from natural causes.) At a September 8 meeting on Seismicity in Oklahoma, according to Rex Buchanan, Interim director of the Kansas Geological Survey: “There was relatively little conversation about fracking and far more conversation about wastewater.”
The error in the reporting occurs, I believe, because people don’t generally understand the difference between drilling and hydraulic fracturing, and produced water and flowback water, and, therefore, merge them all into one package.
Yes, it does appear that the increase in induced earthquakes may be the result of oil-and-gas development, yet totally banning fracking, as Stein and Hillary Clinton support, would not diminish the tremors.
First, not every oil or gas well is drilled using hydraulic fracturing. Fracking is a part of the process used on some wells. However, much of the drilling done in the part of Oklahoma where the seismic activity first occurred is conventional and doesn’t involve fracking.
When a well uses hydraulic fracturing, millions of gallons of water, plus sand and chemicals, are pumped into the well at high pressure to release the resource. When the oil or gas comes up from deep underground, the liquids injected come back to the surface too. This is called flowback water. That water is separated from the oil and/or gas and may be reused, recycled (as I wrote about in December), or disposed of in deep wells known as injection wells—which are believed to be the source of the induced seismic activity.
Produced water is a byproduct of nearly every oil and gas extraction well—whether or not it is fracked. The water, oil, and gas are all “remnants of ancient seas that heat, pressure and time transformed,” explains Scott Tinker, Texas’ state geologist and director of the University of Texas at Austin’s Bureau of Economic Geology. He continues: “Although the water is natural, it can be several orders of magnitude more saline than seawater and is often laced with naturally occurring radioactive material. It is toxic to plants and animals, so operators bury it deep underground to protect drinking-water supplies closer to the surface.”
While the hydraulic fracturing process is typically only a few days, the produced water can be brought to the surface with the oil and/or gas for years. With the increased oil and gas extraction in the past several years—before the 2014 bust, the volumes of wastewater also soared. In parts of Oklahoma, ten barrels of wastewater are produced with every barrel of oil. Scientific American reports that some of those high-volume injection wells “absorbed more than 300,000 barrels of water per month.”
The authors of the Stanford study were “able to review data about the amount of wastewater injected at the wells as well as the total amount of hydraulic fracturing happening in each study area, they were able to conclude that the bulk of the injected water was produced water generated using conventional oil extraction techniques, not during hydraulic fracturing,” writes Ker Than for Stanford. Professor Mark Zoback, lead author of the study states: “We know that some of the produced water came from wells that were hydraulically fractured, but in the three areas of most seismicity, over 95 percent of the wastewater disposal is produced water, not hydraulic flowback water.”
So, if banning fracking won’t stop the shaking, what will? The geologists contacted for this coverage agree that more work is needed. While the quakes seem to be connected to the wastewater injection wells, there are thousands of such wells where no discernable seismic activity has occurred. Oklahoma has been putting new restrictions on some of its thousands of disposal wells for more than a year to curb seismic activity and that, combined with reduced drilling activity due to low prices, has reduced the rate of the tremors. Other mitigation strategies are being explored.
When you hear claims that hydraulic fracturing causes earthquakes, remember the facts don’t support the accusations. Fracking isn’t causing Oklahoma’s increased earthquakes.
The author of Energy Freedom, Marita Noon serves as the executive director for Energy Makes America Great Inc., and the companion educational organization, the Citizens’ Alliance for Responsible Energy (CARE). She hosts a weekly radio program: America’s Voice for Energy—which expands on the content of her weekly column. Follow her on Twitter @EnergyRabbit.