Journal of The Japanese Association for Petroleum Technology
An eight-years exploration effort since 1980 on Block 3 in Angolan waters has resulted in twelve oil discoveries in the Albian Pinda carbonate among twenty-four explora-tion wells. This high rate of success is attributed to favorable setting of source rocks and reservoir rocks both of the Upper Cretaceous age. Reservoir properties of the Pinda carbonate are strongly influenced by a combination of sedimentary fabric and subsequent diagenesis. The repeated sequence of deposits on highenergy oolitic shoals and interupting emergence upgrade the reservoir quality. On the other hand anhydritization, a long-lived diagenesis, controls the final reservoir quality according to the degree of its effect.