Scientific techniques such as AVO must be able to provide consistent results. Although there have been many successful fluid (hydrocarbon versus nonhydrocarbon) predictions made with the AVO technique, there also have been cases where it did not predict the discovered pore fluids. Unfortunately, this inconsistency diminishes a geophysicist's (and his/her manager's) confidence in such methods. Since AVO has been proven to be a useful tool in many hydrocarbon provinces, it behooves us to better understand why certain predictions seem to fail.

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