Analysts skeptical of big oil field in Mexico

Analysts say they are skeptical of news this week from the Mexican state oil monopoly that exploratory drilling in the deep waters of the Gulf of Mexico shows signs of a giant new oil field.

Petroleos Mexicanos, or Pemex, says early indications suggest the field could be as large as 10 billion barrels. But analysts said it was premature to make an estimate based on preliminary drilling.

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