Carbonate diagenesis can theoretically either be enhanced or retarded by petroleum emplacement depending on: the oil-water wettability of the rocks, the CO 2 -content of the migrated petroleum, and the presence of oxidised sulphur or iron compounds in the rocks. A detailed case study of Jurassic oolites from a UK oil field showed first that petroleum emplacement retarded diagenesis in the oil leg and thus helped preserve permeability, but second showed that entrained CO 2 caused cementation and pore-system modification in the water leg.

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