ProAZ

ProAZ maps fractures and predicts stress by observing azimuthal variations in the P-wave seismic data. Prestack azimuthally processed seismic data are analyzed in terms of time and amplitude azimuthal variations attributed to anisotropic effects.

Anisotropy and Fracture Analysis

ProAZ provides a series of tools to enable interpreters to interactively explore for azimuthal variations in their datasets and generate azimuthal attributes to summarize the results.

Benefits of Using ProAZ include:

• Single module to condition, analyze, and interpret the data
• Easy QCs showing the distribution of azimuths and offsets at a particular location
• Quick displays of azimuthally processed data and generation of common offset/common azimuth gathers
• Interactive tools to explore for azimuthal amplitude variations
• Multiple methods to generate azimuthal attributes
• Ability to display azimuthal attributes as platelets in visualization software

Azimuthal Gather Conditioning

The conditioning of azimuthal data is as critical for accurate results as gather conditioning for standard AVO work. Starting from angle or offset gathers, the super gathering of azimuthal data can be done in two different ways:

• Common-offset or Common-angle gathers with variable azimuth within each sector
• Common-azimuth gathers with variable offset within each sector

Anisotropy Indicators - Azimuthal AVO Analysis

The azimuthal AVO analysis tool allows users to interactively analyze and observe amplitude data as a function of azimuth, offset, or both offset and azimuth on a single gather.

Anisotropy Indicators - Azimuthal AVO Attributes

When the azimuthal gathers are properly conditioned and the amplitudes are robust, ProAZ has the ability to create and extract several different azimuthal AVO attributes that can be used to detect and visualize anisotropy.

Two different approaches have been implemented:

• Near-Offset R¨¹ger equation
• Azimuthal Fourier Coefficients