AVO/AVA Analysis

PGS uses a very efficient AVO/AVA workflow that allows for the rapid evaluation of prospectivity over large datasets. The elastic attributes calculated are routinely used as a first step in de-risking prospectivity using pre-stack seismic data.

Based on angle stacks or PSTM/PSDM gathers, we derive a number of AVO/AVA attributes from the seismic data. Some examples of the extracted attributes are:

• Intercept, gradient/pseudo-gradient
• Restricted gradient
• Product
• Fluid factor
• Lithology volume
• Relative P- and S-impedance

PGS' unique workflow, Prospect Scanner, is an effective AVO tool for detecting lithology/fluid anomalies. The workflow combines seismic AVO analysis and inversion technology and derives relative elastic property attributes (P and S wave impedance & Vp/Vs ratio). The workflow manages the inversion of large seismic volumes, making it an excellent regional lithology/fluid screening tool.

Prospect Scanner can:

• Identify fluid and lithology facies through stratigraphic elastic attributes
• Integrate interpretation, petrophysical analysis and reservoir oriented processing
• Quickly analyze prospective areas including volumetric estimates of recoverable oil and gas reserves

The workflow is further enhanced by employing a true amplitude preservation processing sequence (pre-stack time and depth).