Journal
APPLIED GEOPHYSICS
Volume 15, Issue 2, Pages 240-252Publisher
SPRINGER
DOI: 10.1007/s11770-018-0667-8
Keywords
Multiscales; fracture detection; coherence; attenuation; seismic anisotropy
Categories
Funding
- National Natural Science Foundation of China [41474112]
- National Science and Technology Major Project [2017ZX05005-004]
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Common prestack fracture prediction methods cannot clearly distinguish multiplescale fractures. In this study, we propose a prediction method for macro- and mesoscale fractures based on fracture density distribution in reservoirs. First, we detect the macroscale fractures (larger than 1/4 wavelength) using the multidirectional coherence technique that is based on the curvelet transform and the mesoscale fractures (1/4-1/100 wavelength) using the seismic azimuthal anisotropy technique and prestack attenuation attributes, e.g., frequency attenuation gradient. Then, we combine the obtained fracture density distributions into a map and evaluate the variably scaled fractures. Application of the method to a seismic physical model of a fractured reservoir shows that the method overcomes the problem of discontinuous fracture density distribution generated by the prestack seismic azimuthal anisotropy method, distinguishes the fracture scales, and identifies the fractured zones accurately.
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