It was discovered in the 1960s that the presence of gas often resulted in high amplitude events on seismic sections. However, these “bright spots” could also be due to sharp velocity contrasts in the subsurface caused by, for example, igneous intrusions, coal seams, or salt. Amplitude variation with offset (AVO) was first used to differentiate between “bright spots” of hydrocarbon and nonhydrocarbon origin.

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