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Ghawar is the treasure of the Saudi treasure chest. It is the largest oil field in the world and has produced, in the past 50 years, about 55 billion barrels of oil, which amounts to more than half of Saudi production in that period. The field currently produces more than five million barrels a day, which is about half of the kingdom's output. If Ghawar is facing problems, then so is Saudi Arabia and, indeed, the entire world. Simmons found that the Saudis are using increasingly large amounts of water to force oil out of Ghawar. Most of the wells are concentrated in the northern portion of the 174-mile-long field. That might seem like good news -- when the north runs low, the Saudis need only to drill wells in the south. But in fact it is bad news, Simmons concluded, because the southern portions of Ghawar are geologically more difficult to draw oil from. ''Someday (and perhaps that day will be soon), the remarkably high well flow rates at Ghawar's northern end will fade, as reservoir pressures finally plummet,'' Simmons writes in his book. ''Then, Saudi Arabian oil output will clearly have peaked. The death of this great king'' -- meaning Ghawar -- ''leaves no field of vaguely comparable stature in the line of succession. Twilight at Ghawar is fast approaching.'' He goes on: ''The geological phenomena and natural driving forces that created the Saudi oil miracle are conspiring now in normal and predictable ways to bring it to its conclusion, in a time frame potentially far shorter than officialdom would have us believe.'' Simmons concludes, ''Saudi Arabia clearly seems to be nearing or at its peak output and cannot materially grow its oil production.''
Saudi officials belittle Simmons's work. Nansen Saleri, a senior Aramco official, has described Simmons as a banker ''trying to come across as a scientist.'' In a speech last year, Saleri wryly said, ''I can read 200 papers on neurology, but you wouldn't want me to operate on your relatives.'' I caught up with Simmons in June, during a trip he made to Manhattan to talk with a group of oil-shipping executives. The impression he gives is of an enthusiastic inventor sharing a discovery that took him by surprise. He has a certain wide-eyed wonder in his regard, as if a bit of mystery can be found in everything that catches his eye. And he has a rumpled aspect -- thinning hair slightly askew, shirt sleeves a fraction too long. Though he delivers a bracing message, his discourse can wander. He is a successful businessman, and it is clear that he did not achieve his position by being a man of impeccable convention. He certainly has not lost sight of the rule that people who shout ''the end is nigh'' do not tend to be favorably reviewed by historians, let alone by their peers. He notes in his book that way back in 1979, The New York Times published an investigative story by Seymour Hersh under the headline ''Saudi Oil Capacity Questioned.'' He knows that in past decades the Cassandras failed to foresee new technologies, like deep-water and horizontal drilling, that provided new sources of oil and raised the amount of oil that can be recovered from reservoirs.
But Simmons says that there are only so many rabbits technology can pull out of its petro-hat. He impishly notes that if the Saudis really wanted to, they could easily prove him wrong. ''If they want to satisfy people, they should issue field-by-field production reports and reserve data and have it audited,'' he told me. ''It would then take anybody less than a week to say, 'Gosh, Matt is totally wrong,' or 'Matt actually might be too optimistic.''' Simmons has a lot riding on his campaign -- not only his name but also his business, which would not be rewarded if he is proved to be a fool. What, I asked, if the data show that the Saudis will be able to sustain production of not only 12.5 million barrels a day -- their target for 2009 -- but 15 million barrels, which global demand is expected to require of them in the not-too-distant future? ''The odds of them sustaining 12 million barrels a day is very low,'' Simmons replied. ''The odds of them getting to 15 million for 50 years -- there's a better chance of me having Bill Gates's net worth, and I wouldn't bet a dime on that forecast.''
The gathering of executives took place in a restaurant at Chelsea Piers; about 35 men sat around a set of tables as the host introduced Simmons. He rambled a bit but hit his talking points, and the executives listened raptly; at one point, the man on my right broke into a soft whistle, of the sort that means ''Holy cow.''
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http://www.nytimes.com/2005/08/21/magazine/21OIL.html?ei=5070&en=0423aa08c1b8c8de&ex=1124856000&pagewanted=print
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