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Published online July 15, 2021

Copyright © International Union of Geological Sciences.

Improvement of fault interpretation with seismic attribute analysis of Jeju Basin, offshore southern Korea, East China Sea

by Juhwan Woo1*, Chul Woo Rhee1, Ji Soo Kim1, and Bo-sung Lim2

1Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju, Republic of Korea
2Domestic Business Unit, Korea National Oil Corporation, Ulsan, Republic of Korea

Correspondence to:E-mail: jhontawoo@gmail.com

Received: January 14, 2021; Revised: May 14, 2021; Accepted: May 14, 2021

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.