Jim Wilson/The New York Times
At the Midway-Sunset oil field in California, the prize lies fairly close to the surface, so the wells do not have to be very deep. The oil in the Monterey Shale is much less accessible.
FELLOWS, Calif. — Secure in this state's history and mythology, the venerable Midway-Sunset oil field near here keeps producing crude more than a century after Southern California's oil boom. Many of its bobbing pump jacks are relatively short, a telltale sign of the shallowness of the wells and the ease of extracting their prize.
But away from this forest of pump jacks on a flat, brown landscape, a road snakes up into nearby hills that are largely untouched — save for a handful of exploratory wells pumping oil from depths many times those of Midway-Sunset's. These wells are tapping crude directly from what is called the Monterey Shale, which could represent the future of California's oil industry — and a potential arena for conflict between drillers and the state's powerful environmental interests.
At one such exploratory site, tall pump jacks stood above two active wells on a small patch of federal land. For now, the operator, Venoco, has been storing the oil in two large tanks. But construction is scheduled to start soon on pipelines, and more wells are planned.
Comprising two-thirds of the United States's total estimated shale oil reserves and covering 1,750 square miles from Southern to Central California, the Monterey Shale could turn California into the nation's top oil-producing state and yield the kind of riches that far smaller shale oil deposits have showered on North Dakota and Texas.
For decades, oilmen have been unable to extricate the Monterey Shale's crude because of its complex geological formation, which makes extraction quite expensive. But as the oil industry's technological advances succeed in unlocking oil from increasingly difficult locations, there is heady talk that California could be in store for a new oil boom.
Established companies are expanding into the Monterey Shale, while newcomers are opening offices in Bakersfield, the capital of California's oil industry, about 40 miles east of here. With oil prices remaining high, landmen are buying up leases on federal land, sometimes bidding more than a thousand dollars an acre in auctions that used to fetch the minimum of $2.
"We've seen a significant increase in the last three to five years in the price paid from our sales," said Gabriel Garcia, assistant field manager at the federal Bureau of Land Management's office in Bakersfield. "Some of that has to do with speculation on new technologies, and some of that has to do with the high price of oil."
The Monterey Shale has also galvanized California's powerful environmental groups. They are pressing the state to strictly regulate hydraulic fracturing, or fracking, the drilling technique that has fueled the shale oil and gas boom elsewhere but has drawn opposition from many environmentalists. In December, the State Department of Conservation released a draft of fracking rules, the first step in a yearlong process to establish regulations.
Severin Borenstein, a co-director of the Energy Institute at the Haas School of Business at the University of California, Berkeley, said technological advances and the high price of oil were driving interest in the Monterey Shale, just as elsewhere.
"Everyone has known that there is shale oil not just in the Monterey Shale but also in North Dakota and Wyoming and all over the country," he said. "Back in the '70s, there were discussions that there's all this oil and all we've got to do is get it. Now 40 years later, the technologies have become available to actually get it in a cost-effective way."
While oil is found less than 2,000 feet below the surface in fields like Midway-Sunset, companies must pump down to between 6,000 and 15,000 to tap shale oil in the Monterey.
Though production has been declining for years, California remains the country's fourth-largest oil-producing state, after Texas, North Dakota and Alaska. So far, little of the crude is derived from the Monterey Shale, whose untapped deposits are estimated at 15.4 billion barrels, or more than four times the reserves of the Bakken Shale in North Dakota, according to the United States Energy Information Administration.
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