Wavelet Coherence Technique In Seismic Interpretation Applications

By the oil fields' exploration and development continues, the geology objects they face are becoming more and more complex, wherever shapes and structures of geology play the key role in some oil and gas fields' formation. 3-dimensional coherency technique is an efficient method to find and recognize geological freak wave from 3-dimensional seismic data of all techniques. This paper introduced multiscale-coherency theory by combining 3-dimensional coherency technique and multiscale-wavelet transform, furthermore, introduced a fusion method of slice image of coherency tube by calculating in frequency division. The method may extract the geological structure characteristic in given frequency division, and improve on recognizing the geological freak wave; and offers a new thought and method for predicting fracture system research. This paper gains some production and contribution, and it includes:1. By improving the arithmetic of the traditional coherence cube, We advance the speed in calculating seismic coherence tube and shorten the periods of the seismic data interpretation.2. The method of calculating seismic coherence tube in frequency division uses the best arithmetic of C₃ by combining multiscale wavelet analysis, and a modified Morlet wavelet algorithm is proposed and is applied to analyze the seismic signals.3. The fusion method of the image based on multiscale coherence slice combined the theory of mulitiscale analysis and coherence analysis and image fusion with the application in the seismic data interpretation.