Structural and stratigraphic discontinuities, such as fault and unconformity, usually contribute to the construction of traps and reservoirs. Coherence measurement is an effective tool for representing geological discontinuities in 3D seismic data volumes. Compared with the classical real-valued coherence algorithm, coherence calculation using analytic traces can produce both dip related information and discontinuity measurement. In this paper, we incorporate dip scanning into the multi-trace complex-valued correlation algorithm to detect distribution of discontinuities. The proposed algorithm is computationally efficient, since it only utilizes several time samples. In addition, the algorithm can provide two seismic attributes at once, including correlation modulus defining discontinuity and local phase shift connected with dip of events. The local phase shift attribute further provides an alternative way to derive local dip. As well, the algorithm can suppress low-valued artefacts caused by linear and curving dipping events to highlight discontinuous edges. The applications on both synthetic and real data demonstrate its effectiveness.


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