Episodes 2022; 45(2): 133-146
Published online June 1, 2022
Copyright © International Union of Geological Sciences.
Juhwan Woo1*, Chul Woo Rhee1, Ji Soo Kim1, Bo-sung Lim2
1 Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju, Republic of Korea
2 Domestic Business Unit, Korea National Oil Corporation, Ulsan, Republic of Korea
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Seismic attribute analysis is useful in identifying faults and quickly visualizing their 3-D geometrical features. This study presents seismic attribute analysis of 3-D seismic reflection data acquired from the Jeju Basin, offshore southern Korea for fault interpretation. To improve the accuracy of the fault interpretation, noise reduction and spectral enhancement were conducted prior to the seismic attribute analysis. The pre-conditioned seismic volume was used to generate three seismic attribute volumes: dip, tensor, and structurally oriented semblance. These three attribute volumes were co-rendered to compare three different structural attributes effectively. Frequency decomposition volume was created on the basis of the scale, so geological features can be distinctively resolved. Based on the multi-attribute analysis, we quickly identified structural features and accurately interpreted the fault patterns based on their strike direction. Rift-related major faults were identified, and their geometrical characteristics were easily extracted from the 3-D attribute volume. Subtle changes in the strike direction of some normal faults were observed during the rift basin evolution. This observation suggests that the fault development pattern was possibly affected by the change in the magnitude and direction of the extensional stress during the basin evolution or the interaction of the preexisting structural trend and tectonic movement.