Confidence in the ability of AVAZ analysis (amplitude variation with angle and azimuth) to capture information about fractures in a reservoir has steadily increased over the last four years because this technique detected seismic anisotropy in many different reservoirs and the results consistently tied other information about fractures.

This paper attempts to show that AVAZ does generally capture information about fractures of interest—the open, fluid-filled fractures that influence reservoir fluid production—by showing examples from around the world in which the technique has proven successful. Success is judged by the ability to reproduce results comparable to other methods for predicting the...

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