Well OK’d; seismic concerns heard
Garfield County commissioners on Monday approved an oil and gas wastewater injection well near Battlement Mesa after the company responded to concerns that it could trigger earthquakes.
Duke Cooley, senior geologist at Ursa Resources, told commissioners there’s been no correlation between oil and gas injection wells and earthquakes in northwest Colorado’s Piceance Basin.
The Battlement Concerned Citizens group and the Battlement Mesa Service Association, a homeowners group for the unincorporated community, had raised the seismic issue amid mounting concern about an apparent correlation between oil and gas injection wells and earthquakes in several states. Last month, the Colorado Oil and Gas Conservation Commission suspended operation of an injection well in Weld County after a 3.4 magnitude earthquake struck in the Greeley area May 31, followed by smaller quake in June.
“It was a wake-up call. It was the first seismic event there in 30 years,” Doug Saxton of Battlement Concerned Citizens told Garfield commissioners.
He cited what he said is a lack of adequate earthquake monitoring by the U.S. Geological Survey.
“Nothing under 4.0 (magnitude) really gets their attention,” Saxton said.
He said the agency’s closest monitoring site is 75 miles from Greeley, and the nearest to Battlement Mesa is in the Paradox Valley. He called for the installation of monitoring equipment in the Battlement area and for Ursa to cease injection activity if a quake occurs.
But Cooley said a local monitoring station isn’t necessary because Geological Survey equipment can detect quakes of less than 1 magnitude hundreds of miles away.
Garfield County already has 60 approved injection wells, and injection has occurred in 26 of them since 2013, according to the county’s oil and gas liaison, Kirby Wynn. Saxton said Ursa’s would be the seventh within 10 miles of Battlement Mesa.
Cooley said seismic activity occurs where there has been geological folding, which in the case of the Piceance Basin is around its margins.
He also said quakes can occur when water is added that reduces friction along a fault plane where geological compression is occurring, in places like Greeley and Oklahoma. The Piceance Basin, by contrast, is now undergoing geological relaxation after previously having been “folded up,” he said.
Garfield County has surface authority over injection wells but the state oil and gas commission regulates technical “downhole” aspects of the wells such as injection pressure. Lindy Gwinn of Grand Junction, who consults for the industry, told Garfield commissioners Monday, “I can assure you they turn them down when they are not technically correct and there is any risk.”
She noted that the commission recently did just that in Mesa County. In 2012 it turned down a proposal for an injection well southeast of Grand Junction out of concern it could contaminate ground and surface water due to its shallow depth, and possibly induce earthquakes at the U.S. Department of Energy’s uranium mill tailings disposal site a few miles away.
That well would have been less than 2,000 feet deep. Ursa’s would be more than a mile deep.
In agreeing to approve the well, Garfield Commissioner Mike Samson said, “The COGCC, they kind of go over these injection wells with a fine-tooth comb. … I have faith in the COGCC and their very strict regulations that they have.”
Commissioner Tom Jankovsky agreed, and said if seismic activity did occur in the area, the county would ask companies to cease all injections until the cause could be determined.
He also encouraged Ursa to install pipelines to the injection well as soon as possible to reduce truck traffic. Ursa officials indicated they hope to do that soon, and that reduced traffic resulting from being able to inject wastewater rather than otherwise dispose of it would be one of the benefits of the well.
Said Monique Speakman, who supports the proposal and lives on the property where the well will be operated, “It’s going to eliminate truck traffic, noise, dust levels.”
Battlement Mesa resident Mary Haygood said she had been concerned about both the truck traffic and seismic aspects of the well, but told Ursa officials Monday, “You have allayed my fears somewhat by your explanation and I thank you for that.”
Ursa already has spent $2 million to drill the well. It needed to do that to do testing required by the oil and gas commission before it can approve the well. The agency is continuing to review the proposal.