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Mapping channel edges in seismic data using curvelet transform and morphological filter.

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Title: Mapping channel edges in seismic data using curvelet transform and morphological filter.
Authors: Boustani, Bahareh1, Javaherian, Abdolrahim1 javaheri@ut.ac.irjavaherian@aut.ac.ir, Nabi-Bidhendi, Mjid1, Torabi, Siyavash1, Amindavar, Hamid Reza1
Source: Journal of Applied Geophysics. Jan2019, Vol. 160, p57-68. 12p.
Subjects: Curvelet transforms, Chemical decomposition, Seismology, Laplacian matrices, Laplacian operator
Abstract: Abstract Mapping channel edges is a significant issue in 3D seismic data interpretation. In this research, curvelet transform was employed in channel edge enhancement, owing to its high ability to depict curve edges. The default parameters of curvelet transform were used to decompose the data. Hence, there are 6 scales and 16 directions in the 2nd level of decomposition for the real data of this study. Utilizing the modified top-hat algorithm, we calculated the maximum curvelet coefficients in all sub-bands. Employing top-hat in curvelet domain is more effective than the soft or hard thresholding to enhance the channel edges. Channel edges were further detected through morphological gradient algorithm with multi-length and multi-direction structuring elements. A directional feature of the proposed structuring element rendered the curvelet morphological gradient method used in the edge detection. Final edge map resulting from the weighted average of all sub-edge images was obtained from the structuring elements. Channel edge detection by the morphological gradient creates a large number of false edges. However, the combination of the morphological gradient with the curvelet transform eliminates many of those artifacts. The proposed algorithm was applied to both synthetic and real seismic data set containing channels. The findings resulted in a proper channel edge map as good as Canny, Sobel, and Laplacian of Gaussian edge detectors. Highlights • Mapping channel edges is a significant issue in 3D seismic interpretation. • Curvelet transform is a proper scale-space representation for curve singularities. • Curvelet transform is used to enhance channel boundaries in seismic horizon slice. • Morphological gradient algorithm detects channel edges. • The experimental results are comparable with the Canny, Sobel and LoG filters. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract Mapping channel edges is a significant issue in 3D seismic data interpretation. In this research, curvelet transform was employed in channel edge enhancement, owing to its high ability to depict curve edges. The default parameters of curvelet transform were used to decompose the data. Hence, there are 6 scales and 16 directions in the 2nd level of decomposition for the real data of this study. Utilizing the modified top-hat algorithm, we calculated the maximum curvelet coefficients in all sub-bands. Employing top-hat in curvelet domain is more effective than the soft or hard thresholding to enhance the channel edges. Channel edges were further detected through morphological gradient algorithm with multi-length and multi-direction structuring elements. A directional feature of the proposed structuring element rendered the curvelet morphological gradient method used in the edge detection. Final edge map resulting from the weighted average of all sub-edge images was obtained from the structuring elements. Channel edge detection by the morphological gradient creates a large number of false edges. However, the combination of the morphological gradient with the curvelet transform eliminates many of those artifacts. The proposed algorithm was applied to both synthetic and real seismic data set containing channels. The findings resulted in a proper channel edge map as good as Canny, Sobel, and Laplacian of Gaussian edge detectors. Highlights • Mapping channel edges is a significant issue in 3D seismic interpretation. • Curvelet transform is a proper scale-space representation for curve singularities. • Curvelet transform is used to enhance channel boundaries in seismic horizon slice. • Morphological gradient algorithm detects channel edges. • The experimental results are comparable with the Canny, Sobel and LoG filters. [ABSTRACT FROM AUTHOR]
ISSN:09269851
DOI:10.1016/j.jappgeo.2018.11.004