The mechanism and significance of second hydrocarbon|generation from organic matter trapped in fluid inclusions in carbonate rocks are discussed. The types of organic matter and the relationship between them are also reviewed. The organic matter trapped in inclusions and crystals, which account for more than 20% of the total organic matter in carbonate rocks, may be of great significance in the generation of hydrocarbons. High|temperature oil resulting from second hydrocarbon|generation should be an important target, in addition to natural gas, in oil|gas prospecting in regions of high|maturity carbonate rocks.
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