In this paper a new classification for AVO responses is proposed. This classification covers all possible AVO responses and is independent of the fluid content of the beds.

In 1989 Rutherford and Williams introduced a three-fold classification of AVO (amplitude versus offset) characteristics for seismic reflections from the interface between shales and underlying gas sands. The classification scheme they proposed has become the industry standard and has proven its validity and usefulness in countless exploration efforts.

The Rutherford and Williams classification is primarily based on the sign and magnitude of the reflection coefficient (R0) at the top of...

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