ChromaPatternsTM
An innovative method for calculating attributes of 3D seismic data has been developed that relies on cutting each trace at the natural fractal element: for seismic reflection data this is the zero crossing. The resulting samples between zero crossings constitute a fragment. Each fragment is a half-cycle peak or trough. The fragmentation process can be applied to the entire volume. Currently, four attributes are calculated for each fragment: MaxAmp, Shape, String Length Ratio, and Thickness. |
MaxAmp is the value of the highest amplitude of the fragment. Trough samples are given a negative MaxAmp value and peak samples are given a positive value.
Shape uses the first statistical moment to measure the skew of the signal which is considered to be bottom loaded, symmetric, or top loaded. Negative samples are given a negative shape value and positive samples are given a positive shape value.
String Length Ratio can be thought of as a method of determining if the wavelet in a fragment forms a single event or if it also has a shoulder or a doublet or triplet. It is a measure of the complexity of the wavelet.
Thickness is the time separation between the successive zero crossings that define a fragment. In a depth volume, thickness units are feet or meters. Negative samples are given a negative thickness value and positive samples are given a positive thickness value. |
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