Two 3D physical seismic data were acquired and analyzed to verify the physical basis of using P-wave attributes for fracture detection, to understand the usage of these attributes and their merits, and to investigate the effects of acquisition geometry and structural variations on these attributes. One model was designed to maximize the data quality, and another model was designed to increase the offset-depth ratio to the top of the fracture layer. The study of both datasets reveals that the P-wave attributes (traveltime, amplitude and velocity) exhibit azimuthal variations. For the data with high quality, the amplitude from the top of the fracture layer yields the best results that agree with the physical model parameters, but the results from other attributes (traveltime, velocity, AVO gradient) are either contaminated by the structural imprint, or by the acquisition footprint. For the data with larger offset-depth ratio, the traveltime attributes yield the best results, but the results from the amplitudes are affected by the noise and are less reliable.


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