ABSTRACT
Since the seismic coherence cube technique was officially launched at the 65th annual meeting of SEG, the technique has been widely used and it has more obvious strengths in fault identification and special lithologic interpretation than the conventional three-dimensional data. Coherence cube technique uses 3D data to compare the similarity of the local seismic waveform. The lower coherent value point is related to the discontinuities of reflection waveform. It mainly experienced the following ages; the AMOCO Petroleum Company is the first company to propose the coherent technology. Its first-generation algorithm C1-three normalized mutual coherence processing-has a very good detection for high-quality information and has the highest resolution. The C1 algorithm is characterized by calculating the correlation coefficient of the inline and cross-line direction and composing the correlation coefficient of the primary direction. The advantage is that it has a small amount of calculation and is easy to implement. The disadvantage is limited by the material and has a large time window. The second-generation algorithm C2 any multi-channel coherent-is characterized by calculation any multi-channel seismic data coherent. It is a calculation method which based on horizontal slices or a certain time window within layers. It has the advantage of stability, noise immunity and variable window. The disadvantage is that cannot reflect the formation dip. Visualization technology is not only a means of interpretation, but also display means. Third-generation algorithm C3 which is called feature construction uses multi-channel
reflection characteristics of the channel will be different from reflection characteristics of the seismic trace hereabout. So it can lead to the discontinuity of the local seismic trace. By detecting the degree of difference between the seismic trace, the seismic coherence cube technique can detect the information of fault or discontinuous change.
