Oklahoma operators to cut activity in light of "seismic activity."
Oil & Gas Journal is reporting:
The Oklahoma Corporation Commission’s Oil & Gas Conservation Division
(OGCD) announced plans to reduce oil and gas wastewater disposal well
volume in a proscribed area of northern Oklahoma County and southern
Logan County to try and (sic) reduce earthquakes.
Under the plan outlined in an Aug. 4 letter, operators will have a
60-day period during which volume will be reduced 38%, or about 3.4
million bbl under the 2014 total. Such a reduction will bring total
volume for the area to a level under the 2012 total by about 2.4 million
bbl.
An OGCD news release said the area saw its sharpest rise in
seismicity start in late 2012. The agency has been studying the
possibility of earthquake activity being caused by oil and gas
wastewater disposal wells in the state.
Previously, the Oklahoma Geological Survey said it’s “very likely”
that a majority of frequent earthquakes in recent years across central
and north-central Oklahoma were triggered by the injection of produced
water in disposal wells.
Oklahoma experienced a seismicity rate in 2013 that was 70 times
greater than the background seismicity rate observed before 2008, OGS
said in an April statement, adding the accelerating seismicity rate
continued to increase during 2014.
Most Oklahoma earthquakes occurred within crystalline basement,
deeper than most oil and gas operations, OGS said. Arbuckle formations
overlie the crystalline basement.
Much, much more at the link.
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