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Oklahoma calls for more disposal wells to shut after quake

Reuters: Oklahoma's oil and gas regulator released a wide-ranging plan on Tuesday to scale back use of wastewater injection wells in western Oklahoma, just days after a 5.1 magnitude quake rocked the state. Seven counties are affected by the plan, which is the largest push yet in western Oklahoma to curb seismic activity linked to wells to dispose of saltwater, a natural byproduct of oil and gas work. Saltwater disposal needs have grown in tandem with the growth in horizontal drilling and hydraulic fracturing,...