A fracture enhancement method based on the histogram equalization of eigenstructure-based coherence
Dou Xi-Ying1, Han Li-Guo1, Wang En-Li2, Dong Xue-Hua2, Yang Qing2, and Yan Gao-Han2
1. College of Geo-Exploration of Science and Technology, Jilin University, Changchun 130026, China.
2. Research Institute Petroleum Exploration & Development-Northwest (NWGI), Lanzhou 730020, China.
Abstract：
Eigenstructure-based coherence attributes are efficient and mature techniques for large-scale fracture detection. However, in horizontally bedded and continuous strata, buried fractures in high grayscale value zones are difficult to detect. Furthermore, middle- and small-scale fractures in fractured zones where migration image energies are usually not concentrated perfectly are also hard to detect because of the fuzzy, clouded shadows owing to low grayscale values. A new fracture enhancement method combined with histogram equalization is proposed to solve these problems. With this method, the contrast between discontinuities and background in coherence images is increased, linear structures are highlighted by stepwise adjustment of the threshold of the coherence image, and fractures are detected at different scales. Application of the method shows that it can also improve fracture cognition and accuracy.
DOU Xi-Ying,HAN Li-Guo,WANG 恩Li et al. A fracture enhancement method based on the histogram equalization of eigenstructure-based coherence[J]. APPLIED GEOPHYSICS, 2014, 11(2): 179-185.
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2014, Vol. 11 
