Kansas quakes likely caused by disposal of saltwater that results from oil and gas fracking process
Kansas officials have been reluctant to link the
mysterious earthquakes in south central Kansas to fracking, but last
week they said for the first time the temblors are likely caused by
disposal of the waste water that is a byproduct of the oil and gas
extraction process.
“We can say there is a strong correlation between the
disposal of saltwater and the earthquakes,” Rick Miller, geophysicist
and senior scientist for the Kansas Geological Survey, told the
Journal-World.
It's the first time state officials have so clearly stated
the likely cause of the earthquakes, which are afflicting a region where
fracking is widely used.
During hydraulic fracturing, or “fracking” for short,
operators use a mixture of saltwater and chemicals to break tight
underground rock formations to release oil and gas. To get rid of the
water after the fracking process, operators inject the water deep into
disposal wells.
Naming the cause of the earthquakes is, in part, a matter of
semantics. Questions have long been raised about whether fracking
activity is causing the earthquakes, and officials in other states have
concluded that it has. But Kansas officials consider the waste water
disposal a separate process, and so have not considered the fracking
itself to be the key factor in the quakes.
At issue now is what, if any, action to take. The state’s
Sierra Club chapter wants Kansas to follow in the steps of New York, New
Hampshire, Maryland and numerous local governments nationwide and call a
moratorium on fracking. Others, including Lawrence Rep. Tom Sloan, ask
where the nation will get energy if the option is off limits.
Also at issue: Fracking has been a common practice for a long time, but the earthquake spike is relatively new. What changed?
More earthquakes
The number of earthquakes in Kansas went from none in 2012 to more than 120 in 2014, the Kansas Geological Survey has said.
On Thursday, for example, a swarm of earthquakes hit
Caldwell and Anthony, and Guthrie, Okla., during a 12-hour span,
according to the USGS Earthquakes Hazards Program. The largest,
magnitude 3.6, was just south of Caldwell.
In other states with a surge in earthquakes, including
Oklahoma, Arkansas and Texas, scientific studies and government
officials concluded more than a year ago that the temblors were likely
the result of injecting saltwater into disposal wells.
But in Kansas, experts have said they were unsure what was
causing the earthquakes. Were they manmade or were they naturally
occurring?
Gov. Sam Brownback a year ago appointed the Induced
Seismicity Task Force to study the problem, and its report released in
September said there was not enough evidence to link Kansas earthquakes
to the hydraulic fracturing process.
Rex Buchanan, director of the Kansas Geological Survey,
recently told the Journal-World that the confusion over the cause of
Kansas earthquakes may be “a matter of semantics.”
Buchanan said most questions from reporters and the public
were related to fracking and earthquakes — and not disposal of saltwater
and earthquakes.
Buchanan said he does not consider disposing of the leftover saltwater to be part of fracking.
“That distinction is tough for some people, and some people
see it as semantic distinction,” Buchanan said. “I like to be
technically precise about what is going on here.
“If someone were to say these earthquakes were caused by
fracking, there might be one or two, but there is no evidence for it,”
Buchanan said. “The issue of saltwater disposal is completely
different.”
Buchanan said that the task force's charge by the governor
was to study the quakes and come up with a plan to address them. That
charge did not include determining the cause of the earthquakes.
A leader of the Sierra Club, which opposes fracking, said he
was surprised to learn about Buchanan's need for precise verbiage to
explain the cause of the Kansas earthquakes.
“He is not being sincere,” said Joe Spease, chairman of the
Kansas Sierra Club's fracking committee and owner of a renewable energy
company in Overland Park.
“It is so ridiculous, this issue of semantics,” Spease said.
“There are millions of dollars in property damages happening, and we
have our scientists playing word games.”
The Kansas Sierra Club supports a bill, not yet introduced,
to impose a moratorium on fracking to give the oil and gas industry time
to develop a solution to the saltwater disposal issue, Spease said.
“If the government and the Kansas Corporation Commission
care about the people of Kansas and the damages, they will order a
moratorium,” Spease said. “If they only care about the profits of the
oil and gas (industry), it will be business as usual. I hope that is not
the case.”
Something changed
Sloan, a Lawrence Republican who has broad knowledge of
state and federal energy issues, said a moratorium would have a
detrimental impact on the economy.
“If you want to stop the hydraulic fracturing or the
depositing of liquid in disposal wells, where do you want to get your
oil and gas to meet your needs in America?” Sloan asked. He has served
on a number of Federal Energy Regulatory Commission committees and task
forces.
“How do you draw the line ... as you are trying to come to
terms with this? If you don't allow fracking, you will shut down the
entire industry,” he said.
Sloan said experts have a good idea of why the saltwater disposal is causing earthquakes.
Fracking, he said, has been done for decades. Kansas is
where the technique was developed, and saltwater disposal was done
safely without causing earthquakes until recently.
One thing changed: For years there was only vertical
drilling. Now there has been an increase in horizontal drilling, a
process that requires much more water, which eventually must be disposed
of.
“The basic process of storing those liquids has been done
safely for decades,” Sloan said. “I think it is a pressure or volume
factor. The question is are we pumping it down too fast? Are we putting
it in the wrong strata?”
Sloan said the Kansas Geological Survey and scientists
around the country along with the industry are working to answer those
questions.
Government scientists also are working to find alternative
ways to dispose of the water. So far those alternatives, such as
transporting the water to another site or stripping the salt and other
chemicals from the water, are too expensive, industry experts have said.
In Kansas, the geological survey scientists have installed
additional seismographs in Harper, Sumner, Sedgwick and Kingman counties
to measure the unusual seismic activity, said Miller with the survey.
Miller said scientists have seen seismic activity moving
northward through Oklahoma into southern Kansas and are trying to get a
better understanding of why.
“If the gradual northward movement continues, we can watch it,” Miller said. “There is some thought it will move eastward.”
Something that may help Kansas is that most of the major
drillers such as ExxonMobil have left the state for Oklahoma and Texas,
which could reduce the number of new injection wells, Sloan said.