It began as a student project by Professor Jamie Rector's class at the University of California, Berkeley. They wanted to investigate methane emissions from abandoned and sealed oil wells. What the students discovered could turn the approach to California's environmental concerns on its head.
As they researched California’s abandoned oil wells, Rector’s students discovered an abundance of natural oil seeps located above the same fields—and came to a surprising conclusion. Geologically driven, natural oil seeps are a major contributor to California’s greenhouse emissions, they say. And drilling—long seen as the problem, not the answer—might be a panacea for emissions.
Natural seeps occur when liquid oil and gas leak to the Earth’s surface, both on land and under water. California sits on actively moving tectonic plates, which create fractured reservoirs and pathways for the oil to escape. ... Waters off Southern California are rife with seeps, and oil and gas fields ... have some of the highest natural hydrocarbon seep rates in the world, emitting gases such as methane, as well as toxic volatile organic compounds (VOCs). But these geologically driven seeps, Rector notes, have been largely unaccounted for in assessing how oil production fields contribute to California’s greenhouse gas emissions.
“There are hundreds of studies linking oil and gas fields to greenhouse gas emissions, to cancer rates, to climate justice, to groundwater pollution and everything else,” said Rector. “And yet none of these studies ever considered the possibility that it wasn’t from equipment or production, but natural seeps above the oil fields.” ... Rector’s team calculates that natural seeps, together with orphaned wells, produce 50 times more methane emissions than oil and gas equipment leaks in Southern California.
If seeps are driving emissions above oil fields, Rector reasons, plugging abandoned wells may do little to help pollution. In fact, he posits, the only demonstrated way to reduce natural seep emissions is by depleting underlying reservoirs—that is, by drilling.
Pointing to studies showing that oil production has reduced and even eliminated seeps, he suggests California’s current regulatory environment may be counterproductive.
“The crazy thing is, by stopping oil and gas production in California, after we’ve regulated and really gotten equipment emissions way down, we may be increasing seep emissions,” Rector said. “Because these seeps come up through the oil and gas fields, and the only way to stop it is by producing oil.”
The article is much longer than these excerpts, and the situation is of course complex, both scientifically and politically, but I see it as yet another demonstration of the truth that simplistic solutions with the best of intentions often lead to harmful, unintended consequences.
