f Null spaces in AVO inversion of single interfaces

The AVO Inversion and Interpretation are research topics of great interest since they may yield precious information on the elastic parameters of sub-surface targets. This paper is focused on the problem of AVO Inversion of reflections from a single interface. A real data example shows that, even in the simple case of single-interface reflections, a non-unique estimate of the unknown parameters results from a limited-offset data set. The real data are reflections from a low-velocity gas-sand embedded in shales at about 0.7 s traveltime. They produce a classic bright spot that clearly stands out in the stack section.