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Offshore - In 1970 a consortium led by Shell discovered the Amposta oil field with only the second well drilled in the Mediterranean Sea. It was the first oil discovery in the Valencia Trough beneath the Ebro Delta. The structure is a tilted horst with an unconformity at the base of the Cenozoic section resting on fractured Mesozoic carbonates from which heavy (17 API) oil flowed. It was brought onstream in 1973.
This encouraged other companies to acquire acreage and several discoveries were made with lighter oils including Tarraco by Shell in 1973, onstream in 1977. This period culminated in the discovery of the largest field in the region, Casablanca, by CNWL in 1975, 50kms east of the Amposta field in water depths up to 500m. It came onstream in 1978.
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