In exploration, seismic attributes of various types are typically used in concert with traditional prospect analysis to reduce risk. For example, a bright trough/peak seismic amplitude on stacked zero-phase data is commonly associated with petroleum-filled sands in Plio-Pleistocene sediments of the Gulf of Mexico. For deeper and older rocks, the AI (acoustic impedance) difference between sands containing petroleum and surrounding shaly rocks becomes slight and does not produce a diagnostic seismic amplitude on stacked data (Class II AVO environment). In this situation, AVO analysis on CMP gathers may highlight sandy intervals and distinguish which pore fluid is present.

AVO response...

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