ARTICLE

Seismic imaging offshore Pohang using small-boat ultra-high-resolution 3D seismic survey

JUNGKYUN SHIN1 HYUNDO KIM2 WONSIK KIM1 DONGHYO KANG1 CHANSU KIM2 CHANHO PARK3 JOOBONG JEONG4
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1 Korea Institute of Geoscience and Mineral Resources, 905, Yeongilman-daero, Heunghae-eup, Buk-gu, Pohang, Gyeongsangbuk-do, 37559, South Korea.,
2 Geoview Co. Ltd., 423, Hasinbeonyeong-ro, Saha-gu, Busan, 49301, South Korea.,
3 Sherpa Engineering and Construction Inc., South Korea.,
4 Korea Institute of Ocean Science and Technology, South Korea.,
JSE 2020, 29(2), 125–138;
Submitted: 29 October 2018 | Accepted: 17 November 2019 | Published: 1 April 2020
© 2020 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
Abstract

Shin, J.K., Kim, H.D., Kim, W., Kang, D.H., Kim, C.S., Park, C.H. and Jeong, J.B., 2020. Seismic imaging offshore Pohang using small-boat ultra-high-resolution 3D seismic survey. Journal of Seismic Exploration, 29: 125-138. A joint study by the Korea Institute of Geoscience and Mineral Resources (KIGAM) and Geoview Co. Ltd. has developed a new 3D ultra-high-resolution (UHR) seismic survey system called the Engineering Ocean Seismic 3D-Streamer (EOS3D- Streamer). The EOS3D-Streamer is a receiver system comprising two, 8-channel 93 meter streamers that are used in conjunction with a small air gun system as a seismic source. To verify the new system, a test survey was performed over two years in 2016 and 2017 in Pohang City’s Yeongil Bay located offshore the southeastern part of Korea. In the test survey, 139 lines of seismic data were acquired in a survey region of 1,400 m x 500 m. A basic seismic data processing algorithm was applied to the data that was divided by channel. Subsequently, a 3D seismic cube was produced for each channel using a radial basis function (RBF) interpolation method in a stage of 3D flexi-binning. A final 3D cube with an improved signal to noise ratio was produced after normal move-out correction using a 1D velocity model and multi-channel stacking. Finally, a shallow fault and gas analysis was performed through a data interpretation process. Through this study, we confirmed that it is possible to perform economical UHR 3D surveys using general-purpose small vessels in coastal areas where it is difficult for large seismic vessels to enter and perform surveys.

Keywords
ultra-high-resolution
seismic survey
3D
small-boat
EOS3D project.
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing