Seismic amplitude interpretation is often referred to as “AvO” (amplitude variation with offset). This term dates to the 1980s when it was recognized that seismic reflection amplitudes sometimes increased in strength at higher incidence angles (or offsets) when gas was present in a reservoir. However, every seismic reflection has AvO, which makes matters more complicated and explains some spectacular failures using the technology.

Today we realize that seismic amplitudes and their AvO can be interpreted in terms of lithologies, fluids and other properties of economic interest. This subsurface discipline is now more commonly referred to as Quantitative Interpretation (QI), which implies that we might even be able to measure subsurface properties using seismic amplitudes.Integrated seismic amplitude 2 338x309

The key to successfully interpreting seismic amplitudes is to integrate diverse geoscientific information into the analysis. Gone are the days when the QI guru was the person who seemed to understand an array of confusing maths and attributes. Seismic interpreters are probably better placed to bring all relevant information to bear on the problem at hand.

Better predictions are made when sequence stratigraphy, reservoir diagenesis, basin modelling, rock physics, and reservoir engineering information are self-consistent and used in the interpretation of seismic amplitudes. At QIntegral we achieve this using our own proprietary software called Quiacito™, which is enables a seismic interpreter to model measured geophysical data and, in doing so, build greater confidence in their subsurface interpretation.

 For more information click this link to view a 1 page flyer on Quiacito™.