Study: Injection of fracking's waste near faultlines, not drilling, is responsible for quakes

A new study has found that deep injection of oil and gas wastewater appears to be causing more earthquakes than previously thought. Cliff Frohlich, a senior research scientist at the University of Texas' Institute for Geophysics, said that his findings should be taken seriously by drillers especially as the practice spreads to more densely populated areas. His work, reports Mike Soraghan of EnergyWire, was done around the Barnett Shale around Dallas to measure small earthquakes taking place near injection wells. His peer-reviewed study was published in the Proceedings of the National Academy of Sciences.

Soraghan explains that "Frohlich did not find any suggestion that the earthquakes were caused by hydraulic fracturing, or fracking. But fracturing creates millions of gallons of briny, toxic wastewater that drillers must eventually dispose of, usually by injecting it into the type of injection wells Frohlich was studying. That suggests, he said, that earthquakes occur only if there is a fault nearby that is susceptible to being triggered by high volumes of fluid." This suggested to Frolich that drillers could stop the earthquakes by choosing an alternate site to dispose of their wastewater. (Read more)

Injection wells getting more scrutiny as result of earthquakes and concerns about hydraulic fracturing

The advent of large-scale horizontal hydraulic fracturing to produce natural gas has focused new attention on injection wells, an old technology that is being used to dispose of drilling fluids after a frack job is completed.

The nonprofit, nonpartisan investigators at ProPublica have produced a four-part series (whichs eems likely to grow) on the subject, available here. Abrahm Lustgarten writes in the mainbar, "Over the past several decades, U.S. industries have injected more than 30 trillion gallons of toxic liquid deep into the earth, using broad expanses of the nation's geology as an invisible dumping ground."No company would be allowed to pour such dangerous chemicals into the rivers or onto the soil. But until recently, scientists and environmental officials have assumed that deep layers of rock beneath the earth would safely entomb the waste for millennia. There are growing signs they were mistaken." (Read more)

Injection wells are increasingly being blamed for earthquakes, usually small but occasionally damaging. Mike Soraghan of Environment & Energy News writes about a 5.6-magnitude quake that hit central Oklahoma last November. Jerri Loveland, who still can't afford to pay for the damage to her home, doesn't blame fracking. "Coming from an oil-industry family, she sees the connection as having more to do with the millions of gallons of salt-laden water that comes up with the oil and gets reinjected in deep wells nearby. In rare cases, that wastewater can lubricate faults and unleash earthquakes." But Oklahoma oil and gas officials have rejected advice against putting injection wells near geologic faults.

After earthquakes, Ohio governor orders new regulations on deep injection wells

Ohio Gov. John Kasich issued an executive order that immediately imposes new state regulations on deep injection wells used to dispose of chemically laced wastewater from oil and gas drilling. The Associated Press reports that the directive gives the Ohio Department of Natural Resources temporary authority to implement a list of rules announced after a series of Youngstown-area earthquakes was tied to one such well. The official order says the regulations will provide citizen protection possible without causing irreparable harm to an important industry.

Under the order, the chief of the state Division of Oil and Gas Resources Management will have authority to order preliminary tests at proposed well sites, prevent drilling where tests fail, and limit injection pressure. The state also can order installation of automatic shutoff valves and monitor for leakage. The order will not affect a moratorium Kasich placed on deep injection wells surrounding the epicenter of the quakes. The order is effective for 90 days.