Since the early 1980s, when Ostrander demonstrated in a practical setting how amplitudes could change with offset on gathers due to the presence of gas, the industry has strived to understand, define, redefine, and improve the technololgy we call amplitude variation with offset (AVO). We have known for decades that AVO is controlled by the various rock physics parameters of the earth as we transmit and receive acoustic signals. However, it has only been in the last few years—due to improved aquisition, processing, and interpretation techniques—that we have been able to derive and better understand some of these rock physics...

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