Reservoir Services - AVO/Attributes

Amplitude vs. Offset (AVO)
Understanding the behavior of amplitude with offset (or angle of incidence) has been a popular risk assessment tool for many years. AVO is used successfully as a hydrocarbon indicator in many plays, especially younger clastic environments with gas-filled porous sands. A common misconception, however, is that AVO doesn’t work in other environments, such as tight sands or in carbonate plays. Geotrace can prove differently. By using input gathers that are properly imaged, well conditioned and bandwidth extended, we have greatly expanded the scope of this invaluable tool in determining risk.

In the figure above, the RP-RS (fluid factor), RS (lithology indicator) and Gradient vs. Intercept cross plot are shown.

Reducing Risk in Spraberry Sands, Dawson Co., Texas - Identifying the best reservoirs with PreStack Inversion to Rock Properties (Presented at West Texas Geological Society, October 25, 2007)