ECLIPSE (reservoir simulator)
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ECLIPSE is an oil and gas reservoir simulator originally developed by Intera and currently marketed and maintained by GeoQuest, a division of Schlumberger. It is sometimes referred to as an industry standard, because of its widespread use among oil and gas companies all over the world.
Slated for replacement in the year 2008+ with a new simulator currently called Intersect being developed by partnership between Chevron, GeoQuest, and Total S.A..