Most geophysicists working in the hydrocarbon exploration industry will have come across the famous Zoeppritz (1919) equations that govern the AVO (amplitude variation with offset) behavior of reflected seismic waves. That is how the refection coefficient changes with angle of incidence at the boundary of two horizontal layers with different VP/VS ratios. This set of equations was published many years before the advent of exploration reflection seismology and it might be helpful to shed some light, in more than a proverbial sense, on the background of their derivation.

The era of AVO as a DHI for gas...

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