Popular Posts

Monday, January 2, 2012

Disposal Halted at Well After New Quake in Ohio

From the NYTs By HENRY FOUNTAIN  Published: January 1, 2012

An official in Ohio said on Sunday that the underground disposal of wastewater from natural-gas drilling operations would remain halted in the Youngstown area until scientists could analyze data from the most recent of a string of earthquakes there. The latest quake, the 11th since mid-March, occurred Saturday afternoon and with a magnitude of 4.0 was the strongest yet. Like the others, it was centered near a well that has been used for the disposal of millions of gallons of brine and other waste liquids produced at natural-gas wells, mostly in Pennsylvania.

The waste, from the process called hydraulic fracturing that is used to unlock the gas from shale rock, had been injected under pressure into the well, which is 9,200 feet deep. Scientists had suspected that some of the wastewater might have migrated into deeper rock formations, allowing an ancient fault to slip. Similar links between disposal wells and earthquakes have been suspected in Arkansas and Texas.
Andy Ware, deputy director of the Ohio Department of Natural Resources, which regulates gas drilling and disposal wells, said the state asked on Friday that injection at the well be halted after analysis of the 10th earthquake, a 2.7-magnitude temblor on Dec. 24, showed that it occurred less than 2,000 feet below the well. Because of a lack of data, depth estimates of earlier earthquakes had been far less precise.
The owner of the well, D&L Energy Group of Youngstown, stopped injection at 5 p.m. Friday, Mr. Ware said.
When the stronger quake occurred less than 24 hours later, Mr. Ware said, state officials decided to institute a moratorium on the injection of drilling waste within a five-mile radius of the well, “until we are able to take a closer look at the earthquake data that is available.” There are no other disposal wells in operation in the area, Mr. Ware said, but four are under development “and would not come online until we’re able to be sure.”
With the increased production of gas from shale in the United States, the process of hydraulic fracturing, or fracking, has come under fire for its potential to pollute the air and contaminate drinking water. But the events in Youngstown — and a string of mostly small tremors in Arkansas, Oklahoma, Texas, British Columbia and other shale-gas-producing areas — suggest that the technique may lead, directly or indirectly, to a dangerous earthquake.
There have been no reports of significant damage from any of the Youngstown earthquakes, which until Saturday were about 2.1 to 2.7 in magnitude.
According to the United States Geological Survey, the more powerful earthquake on Saturday was felt throughout northeastern Ohio and northwestern Pennsylvania, and as far as Morgantown, W.Va., and even Toronto. One resident in the Youngstown area said that from the way his house shook, he had thought a tree had fallen on it.
The more precise data from the Dec. 24 quake came from instruments installed by scientists from Lamont-Doherty Earth Observatory, a part of Columbia University. John Armbruster, a seismologist with Lamont, said that the data from the Saturday quake should be available within a few days, and that analysis should help pinpoint the location of the fault that slipped.
“In our minds, we were already pretty convinced that these events were connected to the well,” Mr. Armbruster said. “Having that many earthquakes fairly close to a well in Ohio, where there aren’t a lot of earthquakes, was suspicious.”
From the Cleveland Plain Dealer:  

ODNR says injection wells near previously unknown fault line may be cause of quakes

By James Ewinger, The Plain Dealer 12-31-11

McDONALD, Ohio -- The strongest of at least 11 earthquakes to rattle an area near Youngstown in 2011 hit Saturday afternoon. 
The 4.0-magnitude quake -- which shook Christmas trees and knocked books from shelves -- struck about 3 p.m. and was centered in McDonald, the U.S. Geological Survey said. 
Within an hour of the quake, State Sen. Bob Hagan, Democrat of Youngstown, called for a statewide moratorium on injection wells used in fracking, a procedure in which pressurized fluid is injected into a rock formation to harvest natural gas. 
But Jim Zehringer, the director of the Ohio Department of Natural Resources, said the earthquakes were likely related to the injection of brine wastewater into the ground near a previously unknown fault line. The wastewater comes from fracking drilling operations. 
"The seismic events are not a direct result of fracking," he said, according to WJW TV 8. "Rather, we believe the events ... stem from brine being injected into a previously unknown fault line by a well that's only been operational for a year." 
Zehringer said four injection wells within a five-mile radius of a well in Youngstown will remain inactive while further scientific research is conducted. On Friday, ODNR  announced an agreement with Northstar Disposal Services LLC. The company agreed to halt wastewater injections as a precaution so that any potential links with earthquakes can be further assessed.   
There are 177 similar injection wells around the state, and the Youngstown-area well has been the only site with seismic activity, state officials said. 
Hagan said that he has asked William G. Batchelder, the Republican speaker of the Ohio House, to set up bipartisan joint hearings involving the House and Senate but that the speaker has ignored his calls. He also said he tried Saturday to reach Gov. John Kasich.  
"People have accused me of saying the sky is falling, but when the earth is moving, it's a good idea to find out why," Hagan said in a telephone interview. 
Environmentalists and property owners who live near gas drilling wells have questioned the safety of fracking to the environment and public health. Federal regulators have declared the technology safe, however. 
Mike Hanson, coordinator of the Ohio Department of Natural Resources' seismic network, said Saturday that "the suspicion is that the earthquakes are not naturally occurring. They are induced." 
Hanson said even though ODNR shut down the injection well on Friday, quakes could still occur because the pressure has not yet dissipated.  
Most of the other quakes in the area last year were less than 2.7 magnitude. Many struck near the injection well shut down Friday. 
On Saturday, residents near McDonald said they heard a loud boom accompanied by shaking. Sheriff's dispatchers from several nearby counties said there were no immediate reports of damage. 
Charles Kihm, who lives near the epicenter, said he was preparing food in his kitchen when he heard a noise. He initially thought a vehicle had hit his Austintown home. 
"It really shook, and it rumbled, like there was a sound," said Kihm, 82. "It was loud. It didn't last long. But it really scared me." 

No comments:

Post a Comment