Oklahoma and fracking

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{{#badges: FrackSwarm|Navbar-fracking}} Oil output has doubled in the state since the start of 2010, from 160,000 to 320,000 barrels per day, primarily due to fracking for tight oil.[1]


Oklahoma is part of the Caney and Woodford Shales, which are sites of drilling and fracking. The state also has thousands of injection and disposal wells,[2] which have been linked to a 5.7 earthquake in the state in 2011.[3]

Drilling wells

Click here for an interactive map of oil and gas wells.
In 2009, the state had more than 32,000 oil wells, almost 9 percent of the U.S. total.[4]
Continental Resources, the leading tight oil producer in the Williston Basin beneath North Dakota and Montana, revealed in 2012 that its next big target for development is an area southeast of the Cana play it has called the South Central Oklahoma Oil Province (SCOOP).[4]

It was estimated that in 2012, Oklahoma had fracked 2,694 wells.[5]

Shale plays

According to the U.S. Energy Information Administration (EIA), there are three prospective shale plays in the state: the Ardmore, Arkoma and Cana basins, all of which contain parts of the Woodford formation. The Mississippian is also a tight oil formation.[4]

Caney Shale, Oklahoma

The Caney Shale in the Arkoma Basin is the stratigraphic equivalent of the Barnett Shale in the Ft. Worth Basin. The formation has become a gas producer since the large success of the Barnett play.

Woodford Shale, Oklahoma

The Devonian Woodford Shale in Oklahoma is from 50 to 300 feet (15 – 91 m) thick. Although the first gas production was recorded in 1939, by late 2004, there were only 24 Woodford Shale gas wells. By early 2008, there were more than 750 Woodford gas wells.[6][1] Like many shale gas plays, the Woodford started with vertical wells, then became dominantly a play of horizontal wells. The play is mostly in the Arkoma Basin of southeast Oklahoma, but some drilling has extended the play west into the Anadarko Basin and south into the Ardmore Basin.[7] The largest gas producer from the Woodford is Newfield Exploration; other operators include Devon Energy, Chesapeake Energy, Cimarex Energy, Antero Resources, St. Mary Land and Exploration, XTO Energy, Pablo Energy, Petroquest Energy, Continental Resources, and Range Resources. Production from the Woodford Shale has peaked and is now in decline, however.[8]

Disposal wells

Click here for an interactive map of disposal wells.

As of 2012, there are an estimated 11,000 private and commercial injection and disposal wells in Oklahoma. Each year those wells are injected with billions of gallons of oil and gas wastewater, according to the Oklahoma Corporation Commission -- 8.8 billion gallons of wastewater in the last two years. The Corporation Commission says they have not tallied the amount of water injected through private wells.[2]


Oklahoma has seen a sharp rise in the number of earthquakes in the last few years. In August 2011, the Oklahoma Geological Survey examined a cluster of earthquakes in Oklahoma and found "that shortly after hydraulic fracturing began small earthquakes started occurring, and more than 50 were identified, of which 43 were large enough to be located. Most of these earthquakes occurred within a 24 hour period after hydraulic fracturing operations had ceased."[9]

On April 18, 2012, University of Memphis scientist Stephen Horton released his findings that a 5.7 quake in November 2011 was "possibly triggered" by injection wells near the fault that ruptured. Horton found that 63 percent of earthquakes have occurred within 10 kilometers (about 6 miles) of a deep injection well, compared to a 31 percent chance of a random, natural earthquake happening within 10 kilometers of a deep injection well. He did note that the correlation between the location of the quake centers and the wells was complicated by the fact that some of the nearby injection wells had been in operation for 10 years, and the amount of fluid being injected has reportedly been on the decline for the last five years.[10]

In July 2012 it was reported that Oklahoma officials ignored advice about injecting water into faults, to maintain production of oil and natural gas.[11]

A 2013 study published in Geology linked Oklahoma's 5.7 earthquake to underground injection of wastewater, saying a decades-long time lag between injection and tremors is possible. Geologists placed seismometers in the area after the initial quake and were able to track fault rupture areas, which showed close proximity to disposal wells. According to the researchers: "we interpret that a net fluid volume increase after 18 yr of injection lowered effective stress on reservoir-bounding faults. Significantly, this case indicates that decades-long lags between the commencement of fluid injection and the onset of induced earthquakes are possible."[12]

In October 2013 a drilling wastewater operator ceased injections at Oklahoma's Love County Disposal Well after a series of earthquakes. Injection began Sept. 3 and the earthquakes started Sept. 17 in the area near the Texas border, about 100 miles north of Dallas. The strongest was magnitude 3.4.[13]

Oklahoma had 580 earthquakes in 2014 that registered 3 or more on the Richter scale. This was a 500 percent increase in Oklahoma earthquakes over 2013.[14]

In March 2015 it was reported that Oklahoma geologists were pressured by oil industry not to push on with their assessments of possible links between earthquakes in the state fracking.[15]

In June 2015 the Oklahoma Supreme Court ruled that citizens had the right to sue the oil and gas companies responsible for the wells that caused earthquakes, which in turn caused personal injuries or property damage.[16]

Inside Climate News reported that hydraulic fracturing induced earthquakes, as well as wastewater injection induced, have occurred not only in western Alberta and also British Columbia, but also Oklahoma, and Ohio. According to geophysics Dr. Jeffrey Gu, from the University of Alberta, hydraulic fracturing earthquakes likely occur days to weeks after the frack job. Wastewater injection caused earthquakes can happen months to years after the injection.[17]

In November 2015, a regulator with the Oklahoma Corporation Commission said Oklahoma has the most earthquakes of anywhere on earth.[18]

In December 2015 state regulators shut down 7 waste disposal wells.[19] In January 2016 Oklahoma was hit with a dozen or so earthquakes in less than a week. As a result Oklahoma Corporation Commission ordered a number of injection well operators to limit their wastewater disposals.[20]

Oklahoma experienced more than 800 earthquakes in 2015 that had a magnitude 3.0 or greater.[19]

Water usage

Oklahoma averages 4 million gallons per fracked well, or 2% of freshwater use in the state by sector. That amount is estimated to grow to 4.8 percent over the next fifty years.[21] From 2005 to 2012, it was estimated that Oklahoma used 10 billion gallons of freshwater in fracking operations in the state.[5]

Spills and accidents

Click here for an interactive map of spills, leaks, and other drilling incidents.

A 2009 and 2010 report from the EPA Water Quality Protection Division lists concerns the agency has with the state's injection well program, including inaccurately reported data and operators injecting for years without valid permits. Ultimately the report recommends the Corporation Commission in Oklahoma take immediate actions to fix "critical problems."[2]

Worker deaths and injuries

Between October and June 2012, the U.S. Occupational Safety and Health Administration (OSHA) Oklahoma City reported nine work-related deaths in the oil/gas industries and three people who were injured in a drilling rig fire. In response, OSHA, the state Department of Labor, and the Mid-Continent Exploration & Safety Production Network asked Oklahoma’s oil and gas exploration and production companies to stand down and stop operations for a meeting on safety issues.[22]

Legislative issues and regulations

In July 2011 the Oklahoma Corporation Commission was established to regulate hydraulic fracturing of oil and gas wells as a well completion operation. The Commission’s environmental protection rules were set up to address various aspects of well completion, and compliance with the rules is assured through inspection, reporting, investigation, and enforcement mechanisms.[23]

In May 2015 Oklahoma lawmakers followed Texas's lead and voted to place a ban on local fracking bans. As of May 26, 2015 Oklahoma's governor was deciding whether or not to sign the bill.[24]

Chemical disclosure

In May 2012 it was voted that Oklahoma oil and natural gas producers would to forced to disclose the chemicals used in their hydraulic fracturing operations under new rules set to go into effect July 1, 2012. Oklahoma Governor Mary Fallin signed off on the rules, which were approved by the Oklahoma Corporation Commission. Companies will report directly to the commission or use FracFocus.org.[25]

As of January 2014, operators of all oil and gas wells in the state must report the chemicals used in hydraulic fracturing either directly to the website FracFocus.org or to the Oklahoma Corporation Commission, which will add the information to the FracFocus database.[26]

Federal lands

In September 2013 it was reported that the Oklahoman government would join Alabama, Montana and Alaska in protesting Bureau of Land Management plans to regulate hydraulic fracturing on federal land.[27]

Citizen activism

Citizen groups

Industry groups


Diesel in Fracking

From 2010 to July 2014 drillers in the state of Oaklahoma reported using 1,465.68 gallons of diesel injected into 23 wells. The Environmental Integrity Project extensively researched diesel in fracking. The organization argues that diesel use is widely under reported.

The Environmental Integrity Project 2014 study "Fracking Beyond The Law, Despite Industry Denials Investigation Reveals Continued Use of Diesel Fuels in Hydraulic Fracturing," found that hydraulic fracturing with diesel fuel can pose a risk to drinking water and human health because diesel contains benzene, toluene, xylene, and other chemicals that have been linked to cancer and other health problems. The Environmental Integrity Project identified numerous fracking fluids with high amounts of diesel, including additives, friction reducers, emulsifiers, solvents sold by Halliburton.[28]

Due to the Halliburton loophole, the Safe Drinking Act regulates benzene containing diesel-based fluids but no other petroleum products with much higher levels of benzene.[29]

Fracking and earthquakes

A 2011 United States Geological Survey (USGS) report, Examination of Possibly Induced Seismicity from Hydraulic Fracturing in the Eola Field, Garvin County, Oklahoma," links a series of earthquakes in Oklahoma in January 2011 to a fracking operation underway there. The USGS found that, overall, some 50 small earthquakes had been registered in the region, ranging in magnitude from 1.0 to 2.8. The bulk occurred within 2.1 miles of Eola Field, a fracking operation in southern Garvin County. The USGS determined that "the character of the seismic recordings indicate that they are both shallow and unique.”



  1. John Kemp, "Oklahoma is next destination for shale revolution," Reuters, Oct 21, 2013.
  2. 2.0 2.1 2.2 Jennifer Loren, "Oklahoma Oil And Gas Injection Regulations Come Under Fire," Oklahoma Six, Feb. 21, 2012.
  3. Katie M. Keranen, Heather M. Savage, Geoffrey A. Abers, and Elizabeth S. Cochran, "Potentially induced earthquakes in Oklahoma, USA: Links between wastewater injection and the 2011 Mw 5.7 earthquake sequence," Geology, January 2013.
  4. 4.0 4.1 4.2 John Kemp, "Oklahoma is next destination for shale revolution," Reuters, Oct 21, 2013.
  5. 5.0 5.1 "Fracking by the Numbers" Environment America, October 2013.
  6. Travis Vulgamore and others, "Hydraulic fracturing diagnostics help optimize stimulations of Woodford Shale horizontals," American Oil and Gas Reporter, Mar. 2008, p.66-79.
  7. David Brown, "Big potential boosts Woodford," AAPG Explorer, July 2008, p.12-16.
  8. Woodford Shale production, 2005-2011, The Oil Drum
  9. Austin Holland, "Examination of Possibly Induced Seismicity from Hydraulic Fracturing in the Eola Field, Garvin County, Oklahoma," Oklahoma Geological Survey Open-File Report, 2011.
  10. Mike Soraghan, "EARTHQUAKES: Drilling waste disposal risks another damaging Okla. quake, scientist warns," E&E reporter, April 19, 2012.
  11. [Okla. officials ignore advice about injecting into faults] E&E, July 25, 2012.
  12. Katie M. Keranen, Heather M. Savage, Geoffrey A. Abers, and Elizabeth S. Cochran, "Potentially induced earthquakes in Oklahoma, USA: Links between wastewater injection and the 2011 Mw 5.7 earthquake sequence," Geology, January 2013.
  13. Mike Soraghan, "Okla. disposal well shuts down after tremors," E&E, October 2, 2013.
  14. "Earthquake in Oklahoma: Fracking and the Quake Epidemic (500% Increase)" John Paul Brammer, BNR, December 29, 2015.
  15. "Oil & gas execs ‘pressured’ Oklahoma geologists not to reveal fracking-quakes link" Russia Today, March 5, 2015.
  16. "Citizens Can Sue Fracking Companies for Earthquake Damage, Says Oklahoma Supreme Court" Anastasia Pantsios, EcoWatch, July 1, 2015.
  17. [http://insideclimatenews.org/news/05082015/alberta-earthquakes-tied-fracking-not-just-wastewater-injection-canada "Alberta Earthquakes Tied to Fracking, Not Just Wastewater Injection"> Zahra Hirja, Inside Climate News, Aug 6, 2015.
  18. "Citizens Can Sue Fracking Companies for Earthquake Damage, Says Oklahoma Supreme Court" Eric Levitz, New York Magazine, November 11, 2015.
  19. 19.0 19.1 "This One Suit Could Take Down Oklahoma’s Oil And Gas Industry" Samantha Page, Think Progress, December 11, 2015.
  20. "12 Earthquakes Hit Frack-Happy Oklahoma in Less Than a Week" Cole Mellino, EcoWatch, January 5, 2016.
  21. "Oklahoma oil industry uses less than 2 percent of state's water" Adam Wilmoth, NewsOK, March 30, 2014.
  22. "Safety groups ask for Okla. oil, gas stand downs," AP, June 19, 2012.
  23. "Regulations" GroundWork, accessed April 24, 2012.
  24. "Oklahoma Lawmakers Pass Measure Preventing Local Fracking Bans" Joe Wertz, National Public Radio, May 26, 2015.
  25. "Oklahoma approves fracking disclosure rules" Jay F. Marks, NewsOk, May 29, 2012.
  26. Adam Wilmoth, "New disclosure rules target chemicals used in fracking," NewsOK, January 1, 2014.
  27. "Montana joins 3 other states in protesting fracking rules" Associated Press, August 29, 2013.
  28. "Fracking Beyond The Law, Despite Industry Denials Investigation Reveals Continued Use of Diesel Fuels in Hydraulic Fracturing," The Environmental Integrity Project, August 13, 2014.
  29. "Fracking's Toxic Loophole Thanks to the Halliburton Loophole Hydraulic Fracturing Companies Are Injecting Chemicals More Toxic than Diesel ," The Environmental Integrity Project, October 22, 2014.

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