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In page Oil reserves in Southeast Asia:

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Though off-shore drilling was not a practise first used in Southeast Asia and in China, attitudes changed after petroleum drilling in the Gulf of Mexico proved to a highly lucrative endeavour in the years following World War II. Because of the vast areas of relatively shallow waters surrounding Indonesia and Southeastern Asian countries, drilling in these areas was a clear and easy conclusion to draw. Shell, the first to discover oil in these areas, naturally brought the first offshore drilling rig here, specifically to the Brunei coast in 1958.[2] Brunei would later evolve into a joint venture owned in equal shares by the Brunei Government and the Royal Dutch/Shell group of companies.