This article is a big deal. It's by David Luhnow, (david.luhnow@wsj.com), and is another article in the WSJ's exceptional series on the decline of Cantarell.
http://users2.wsj.com/lmda/do/checkLogin?mg=evo-wsj&url=http%3A%2F%2Fonline.wsj.com%2Farticle%2FSB117570687954959825.htmlMexico Tries to Save A Big, Fading Oil Field
AKAL C OIL PLATFORM, Gulf of Mexico -- In March 1971, a Mexican fisherman named Rudesindo Cantarell took a few geologists from state-run oil company Petróleos Mexicanos to this spot, where he had seen oil slicks. Mr. Cantarell didn't know it, but he had stumbled across one of the largest offshore oil fields ever found.
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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."
http://www.theoildrum.com/node/2438#comment-176485Cantarell, The Second Largest Oil Field in the World Is Dying
Copyright 2004 G.R. Morton This can be freely distributed so long as no changes are made and no charges are made.
http://home.entouch.net/dmd/cantarell.htmThe second largest producing field in the world is the Cantarell complex in Mexico. It lies 85 kim from Ciudad del Carmen. The field was discovered in 1976 and put on production in 1979. This is one of the geologically interesting oil fields because the producing formation was created when the Chicxulub meteor impacted the earth...
Originally the field had 35 billion barrels of oil in place. Now, in place oil is not reserves. They expect to get around 50% of that oil out of the ground to market. The field reached an early peak in production of 1.1 million barrels per day in April of 1981 from 40 oil wells. By 1994 the production was down to 890,000 barrels of oil per day. At that time, cumulative production was 4.8 billion barrels. In 1995 it was producing 1 million barrels per day and the Mexican government decided to invest in that field to raise the production level. They built 26 new platforms, drilled lots of new wells and built the largest nitrogen extraction facility capable of injecting a billion cubic feet of nitrogen per day to maintain reservoir pressure. Doing this raised the oil production rate in 2001 to 2.2 million barrels per day. Today the field produces 2.1 million barrels.
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A couple of weeks ago I ran into this from the oil industry rags I read. It is a chilling thought since this is the 2nd biggest producer of oil on earth. Ghawar produces 4.5 million bbl/day, Cantarell, 2.2 million bbl/day, Da Qing and Burgun around 1 million per day.
"Supergiant Cantarell continues to be the mainstay of Mexican oil production, with 2.1 MMb/d of output in 2003 up from 1.9 MMb/d in 2002. However, Cantarell is expected to decline rapidly over the next few years, falling as far as 1 MM b/d by 2008. This has given particular urgency to Pemex's efforts to develop other fields and move into deepwater." For now, Pemex's best alternative project is the heavy-oil complex known as Ku-Maloob-Zaap, in Campeche Bay close to Cantarell. Output from this complex was 288,000 b/d in 2003 and is expected to rise to about 800,000 b/d by the end of the decade." David Shields, "Pemex Ready to Drill in Deepwater Perdido Area," Offshore, June 2004, p. 38
Even the largest fields we find offshore in the deepwater today only produce about 250,000 bbl/day. It will take about 4 of them to replace this decline in Cantarell.
And even the heavy oil field they mention won't replace the loss of Cantarell by the end of the decade. And one must remember that all oil fields which are producing today, are in the process of declining.
The implications of this upcoming decline are tremendous to the world. This field produces half of what Ghawar does and it won't be doing that much longer.
The effect on the energy supply will be felt and there is no way for that not to happen. On Aug. 3, 2004, the OPEC president stated that OPEC has no more spare capacity. They are pumping all out and can't satisfy the demand for oil. If fields like Cantarell begin declining, the problem of supplying the world with oil will only get worse.http://home.entouch.net/dmd/cantarell.htm