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FracTex - Fracture Detection using Textural Attributes
FracTex plug-in computes gray level co-occurrence matrix (GLCM) based attributes in different directions and compares these results. Based on that comparison a factor for seismic anisotropy is estimated and the azimuth of the direction with most variability in seismic character is determined. This information can then be correlated with fracturing, faulting, or changes in seismic facies.
Fracture Intensity Estimation
The plug-in allows the computation of 21 different directional GLCM-based attributes and uses eight of these attributes in the FracTex algorithm. Based on a linear transformation with 16 gray levels and a small analysis window of 3x3x11 it is possible to visualize subtle features. Higher numbers of gray levels or larger analysis windows tend to focus on fault zones.
Channel Facies Description
Directional analysis of textural attributes can reveal spatial variations in seismic data, which might be associated with facies changes. In the given example the FracTex attribute (Energy) shows different compartements within channel systems.
Delineation of Vulcanic Rocks and Fault Zones
With the help of attributes based on the gray level co-occurrence matrix (GLCM) it is possible to highlight spatial variations within seismic data. These small scale variations can be due to fracturing, fault zones, or might associated with seismic facies changes.