Cantarell was the name of a fisherman who discovered the field - his nets kept getting coated with oil, he kept complaining to Pemex about it, and Pemex finally investigated and found the field.

See my post yesterday for a couple of additional graphics:

http://www.theoildrum.com/node/2434#comment-176409

This might be the best article in WSJ's Cantarell series yet. The author extends the discussion of Cantarell to the status of the worlds super giant fields, quoting Simmons at one point:

The demise of Cantarell highlights a global issue: Nearly a quarter of the world's daily oil output of 85 million barrels is pumped from the biggest 20 fields, according to estimates from Wood Mackenzie, a Scotland-based oil consulting firm. And many of those fields, discovered decades ago, could soon follow in Cantarell's footsteps.

It's widely believed that the world's biggest oil fields have already been found. In the decades leading up to the 1970s, the world discovered eight big fields that produced between 500,000 to one million barrels a day, according to Matthew Simmons, a veteran oil industry banker. During the 1970s and 1980s, only two were found. Since then, only one -- the Kashagan field in Kazakhstan -- has the potential to easily top the 500,000 barrel-a-day mark.

Two decades ago, about a dozen fields produced more than a million barrels a day. Now there are only four, one of which is Cantarell. The future of two others, discovered more than 50 years ago, remains in question. Some analysts speculate Saudi Arabia's Ghawar, the biggest field by far, could begin a gradual decline within a decade or so. Another, Kuwait's Burgan, is showing signs of maturity. In November of 2005, Kuwait Oil Co. lowered its estimate of the field's sustainable production level to 1.7 million barrels a day from 1.9 million a day.

Replacing big gushers is difficult. Industrialized countries, which tapped out their big fields years earlier, haven't been able to maintain output despite finding large numbers of smaller fields and investing heavily in technology. Alaska production, hurt by declines at the giant Prudhoe Bay field, dropped from 2 million barrels a day in 1988 to a current rate of about 900,000 a day.

"The world faces a situation where we have production from smaller and smaller fields trying to keep up with declines from the big fields like Cantarell," says Mike Rodgers, a partner at industry consulting firm PFC Energy in Houston. "You're on a treadmill trying to keep up, and you get to a point where you can't make any more forward progress."