Massive leaks are an everyday occurrence in gas fields

After one of the many attempts to plug the methane-leaking well at the Aliso Canyon natural gas storage facility in the Los Angeles suburbs, the thing erupted like a geyser, spewing not only natural gas, but also the muddy slurry that company technicians had pumped into the well.

Aliso Canyon is a bit like a gigantic, catastrophic version of the geyser gas well of yore. Since the leak was first noticed, in late October, some 4.6 billion cubic feet of natural gas have leaked into the atmosphere. Most of that is methane, a particularly potent greenhouse gas, along with smaller amounts of other compounds such as benzene, a known carcinogen, and mercaptan, a sulfur compound added as an odorant to the gas.

Far more methane — and all those other nasties that accompany it in natural gas — are seeping out of the vast oil and gas infrastructure that is woven throughout the landscape of the San Juan Basin of Colorado and New Mexico, one of the most productive natural gas fields in the nation.

San Juan Basin oil and gas facilities emitted 291,162 metric tons of methane during 2014, according to the EPA inventory. But the inventory doesn’t account for smaller producers, geologic seeps that have been exacerbated by oil and gas development, abandoned wells or undetected leaks. So actual emissions from oil and gas facilities far exceed the EPA’s greenhouse gas inventory.

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