A Massively Parallel reservoir simulator (POWERS) has been developed and fully integrated with Suadi Aramco's pre and post processing graphical environment. The simulator has been validated against published results and other industrial simulators. Three different giant oil field studies using million grid blocks were carried out by using the new simulator. Benchmark runs indicated near linear performance improvement with linearly increasing number of processors. With the current capabilities mega cell construction, preprocessing and post processing is quite fast. History match runs involving over million grid block and 30-50 years of history is obtained in less than one hour on a low cost parallel computer.

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