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Southeastern China is comprised of 3 crustal blocks, the North China Block, the Yangtze Block and the Cathaysia Block which collided through continent to continent collision in the Pre-Cambrian to form part of the Eurasian continent.
Hong Kong lies on the southern edge of the Cathaysia Block. The present-day tectonic setting is now a passive margin with no plate boundary along the edge of the continental platform. The oldest rocks in Hong Kong are of late Palaeozoic age and comprise non-marine and shallow marine meta-sediments in the northeast and northwest.
Some Mesozoic pre-volcanic sedimentary rocks are also present comprising Early and Middle Jurassic sandstones, siltstones, and mudstones that were deposited in a shallow marine environment. However, volcanic and plutonic rocks predominate. These are of Late Jurassic to Early Cretaceous age which were emplaced during rifting of the South China Sea.
Limited sediments were then deposited after the rifting stage comprising non-marine red beds and evaporites in fault-controlled basins. In this passive margin setting Globalshift considers that Hong Kong, without access to offshore waters further out than 5.6 kms, has no oil and gas potential.