Mark W. Longman Consulting Geologist Lakewood, Colo. Worldwide, carbonate buildups of all ages serve as reservoirs for approximately 40 billion bbl of recoverable hydrocarbons.1 About 40% of this total, 16 billion bbl of oil equivalent, occurs in Tertiary buildups in Southeast Asia. This wealth of hydrocarbon reserves makes these, and particularly the Miocene buildups, the single most important set of carbonate buildup reservoirs in the world. Furthermore, estimated reserves in these Miocene buildups continue to grow. Recent large discoveries by Occidental Petroleum Corp. in the Sarawak basin of eastern Malaysia and by Vaa...

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