Permian Oil Fields Leak Enough Methane for 7 Million Homes
(Bloomberg Law) -- Enough gas to supply 7 million homes is leaking into the atmosphere above oil fields in Texas and New Mexico—the largest plume of climate change-driving methane pollution ever recorded over a U.S. oil field, a new study from Harvard University and Environmental Defense Fund shows.
The methane over the Permian Basin emitted by oil companies’ gas venting and flaring is double previous estimates, and represents a leakage rate about 60% higher than the national average from oil and gas fields, according to the research, which was published Wednesday in the journal Science Advances.
“Our study found that the quantity of methane emitted in the Permian Basin are the highest ever measured from any U.S. oil and gas basin. This is a really big deal from a climate standpoint,” the study’s lead authors, Harvard atmospheric scientist Yuzhong Zhang and EDF scientist Ritesh Gautam, said via email Wednesday.
Methane is the primary component of natural gas. It also is a powerful driver of climate change that is 34 times more potent than carbon dioxide at warming the atmosphere over the span of a century. Eliminating methane pollution is essential to preventing the globe from warming more than 2 degrees Celsius (3.6 degrees Fahrenheit)—the primary target of the Paris climate accord, scientists say.
$250 Million Worth of Methane
The Permian Basin’s methane pollution accounts for about 10% of the total global increase in methane emissions from 2010 to 2020, Robert Howarth, a Cornell University biogeochemist studying fugitive methane emissions from oil and gas fields, said. He was unaffiliated with the study.
“We need to be reducing methane emissions, not allowing them to grow,” Howarth said. “When these sort of emission rates are considered, methane makes the greenhouse gas footprint of natural gas far worse than even that of coal.”
Levels of methane in the atmosphere have been steadily rising since 2004 and spiked in 2019, according to National Oceanic and Atmospheric Administration data released April 5.
All told, Zhang and Gautam found that up to 2.7 teragrams of methane are leaking into the atmosphere in the basin.
The researchers used satellite data gathered in 2018 and 2019 to measure and model methane escaping from gas fields in the Permian Basin, which stretches across public and private land in west Texas and southeastern New Mexico.
“These emissions are a major climate problem as well as a huge waste of resources,” Zhang and Gautam said. “This research shows the tremendous potential for satellites to measure greenhouse gas emissions.”
The leaking and flaring of methane had a market value of $250 million as of Wednesday afternoon, said Jon Coifman, communications director at the Environmental Defense Fund.
Methane pollution is common in shale oil and gas fields such as those in the Permian Basin because energy companies vent and burn off excess natural gas when there are insufficient pipelines and processing equipment to bring the gas to market. About 30% of U.S. oil production occurs in the Permian Basin, and high levels of methane pollution have been recorded there in the past.
Industry groups such as the Texas Methane and Flaring Coalition have criticized previous EDF methane emission research. The coalition aims to address venting and flaring issues in the Permian and other oil-producing basins in Texas and was formed in March by a group of Texas oil companies and trade associations and led by the Texas Oil and Gas Association.
In the last three weeks, the coalition has repeatedly said EDF’s earlier Permian pollution data were exaggerated and flawed.
The Texas Oil and Gas Association will review the study, but the Texas Methane and Flaring Coalition is making “great strides” in cutting methane emissions from venting and flaring, Texas Oil and Gas Association President Todd Staples said.
“Through these industry-led programs, industry is developing innovations, pioneering technologies, and achieving efficiencies that are successfully reducing emissions,” Staples said.
The Texas Railroad Commission, which regulates the oil and gas industry in Texas, allows companies to flare and vent their excess gas. The commission didn’t respond to a request for comment.
A ‘Top Down’ Approach
Zhang and Gautam’s use of satellites to measure methane is a different approach than the methods used by federal agencies, including the EPA, which base their estimates on expected leakage rates at oil and gas production equipment on the ground.
A “top-down” approach to measuring methane using aircraft or satellite data almost always reveals higher levels of methane emissions than the EPA’s “bottom-up” approach, Howarth said.
EDF has been working with universities and energy companies since 2012 to study methane emissions from oil and gas fields nationwide.
A separate February analysis by Oslo-based Rystad Energy, an independent research company, found less methane pollution escaping from the Permian than the EDF and Harvard researchers found. Rystad found enough leakage to supply gas to 5 million homes.
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