Moderately Deep Seismic Reflection Imaging of the Ulleung Basin,  East Sea using Post- and Pre-Stack Migration

Snons Cheong; Young-Jun Kim; Byoung-Yeop Kim; Nam-Hyung Koo; Ho-Young Lee

doi:10.12972/ksmer.2014.51.6.845

All Issue

2014 Vol.51, Issue 6 Preview Page Next Page

Technical Report

Moderately Deep Seismic Reflection Imaging of the Ulleung Basin, East Sea using Post- and Pre-Stack Migration 탄성파 반사법 자료의 참 반사 보정(겹쌓기-전 및 겹쌓기-후)을 적용한 울릉분지의 심부 영상화

31 December 2014. pp. 845-854

PDF XML

Abstract

Seismic reflection surveys were conducted on the Ulleung Basin of East Sea, Korea to explore hydrocarbon and to gain insight into geological structure. More distinct and crisp reflection image is required for successful interpretation of subsurface structures. Many estabilished seismic sections of Ulleung Basin were confined to the image of shallow subsurface. We tested migration parameters to produce seismic sections with an imaging depth to 5.0 s for Ulleung Basin. The result showed continuity enhancement of deep reflectors including unconformity layer. Especially pre-stack time migration section clearly described the boundary between acoustic basement and basin filling sediment. Diffraction noises on the stack section decreased after both post-stack and pre-stack migration. Amplitude of pre-stack migrated section emphasized the impedance change by strong reflection event at the acoustic basement. These time-migrated sections would be effectively used as tools for geological study explaining depositional evolution of Ulleung Basin.

Keywords

Ulleung basin

Seismic Section

Migration

Reflection Imaging

국내 울릉분지의 탄화수소 자원 탐사 및 지질구조 기초연구 등의 목적으로 일련의 탄성파 탐사가 수행되었다. 성공적인 탄성파 해석을 위해 지하 구조를 정확하게 묘사하는 탄성파 단면이 필요하다. 울릉분지의 기존 연구사례에서 소개된 탄성파 단면들은 영상화되는 영역이 천부에 국한된 경우가 다수이다. 본 연구에서는 울릉분지의 지하구조를 5.0 s 하부까지 영상화하기 위하여 참 반사 보정을 수행하였다. 시간 영역 참 반사 보정을 적용하여 부정합면을 포함하는 심부 지하구조의 연속성이 향상됨을 확인하였다. 참 반사 보정 결과 퇴적층서와 기반암의 경계가 명확히 구분되었고 에돌이 잡음이 감소하였다. 겹쌓기-전 참 반사 보정단면은 반사 신호의 진폭이 강조되어 음향 기반암 매질 특성을 반영하였다. 연구 결과 도출된 시간 영역 참 반사 보정 탄성파 단면은 울릉분지 퇴적 발달양상을 연구하는데 도움이 될 것이다.

키워드

울릉분지

탄성파 단면

참 반사 보정

영상화

References

Choi, D., 1998, “Seismic sequence stratigraphy in the south-western margin of the Ulleung Basin, East Sea,” Korean Journal of Petroleum and Geology, Vol. 6, No.1, pp. 1-7.

Horozal, S., Lee, G.H., Yi, B.Y., Yoo, D.G., Park, K.P., Lee, H.Y., Kim, W., Kim, H.J. and Lee, K., 2009, “Seismic indicators of gas hydrate and associated gas in the Ulleung Basin, East Sea (Japan Sea) and implications of heat flows derived from depths of the bottom-simulating reflector,” Marine Geology, Vol. 258, pp. 126-138.

Jang, S., Suh, S. and Go, G., 2006, “Prestack depth migration for gas hydrate seismic data of the East Sea,” Economic and Environmental Geology, Vol. 39, No. 6, pp. 711-717.

Joh, M.H. and Yoo, D.G., 2009, “Plio-Quaternary seismic stratigraphy and depositional history on the southern Ulleung Basin, East Sea,” J. of the Korean Society of Oceanography, Vol. 14, No. 2, pp. 90-101.

Kim, H., Han, S., Lee, G.H. and Huh, S., 1998, “Seismic study of the Ulleung Basin crust and its implications for the opening of the East Sea (Japan Sea),” Marine Geophysical Researches, Vol. 20, pp. 219-237.

Kim, Y., Lee, K., Jo, S., Kim, M., Kim, J. and Park, M., 2012, “A preliminary evaluation on CO₂ storage capacity of the southwestern part of Ulleung Basin, offshore, East Sea,” Economic and Environmental Geology, Vol. 45, No. 1, pp. 41-48.

Ko, S.W., Yang, S.J. and Shin, C.S., 2001, “Weighted Kirchhoff prestack depth migration using smooth background model,” Geophysics and Geophysical Exploration, Vol. 4, No. 3, pp. 84-88.

Koo, N., Kim, W., Kim, B., Cheong, S., Kim, Y., Yoo, D., Lee, H. and Park, K., 2008, “2-D/3-D seismic data acquisition and quality control for gas hydrate exploration in the Ulleung Basin,” Mulli-Tamsa, Vol. 11, No. 2, pp. 127-136.

Lee, G.H., Kim, H.J., Suh, M.C. and Hong, J.K., 1999, “Crustal structure, volcanism and opening mode of the Ulleung Basin, East Sea (Sea of Japan),” Tectonophysics, Vol. 308, pp. 503-525.

Lee, G.H., Kim, H.J., Han, S.J. and Kim, D.C., 2001, “Seismic stratigraphy of the deep Ulleung Basin in the East Sea (Japan Sea) back-arc basin,” Marine and Petroleum Geology, Vol. 18, pp. 615-634.

Mo, C.H., 2013, “Processing of 3-D seismic data from the Ulleung Basin, East Sea,” MS Thesis, Pukyong University, Korea.

Na, J., Kim, H., Jou, H., Byun, J., Yoo, D. and Jang, N., 2011, “Analysis of seismic attenuation associated with gas hydrate occurrence in the Ulleung Basin, East Sea,” Proc. of the Annual Meeting of KSEG, Korean Society of Earth and Exploration Geophysicists, Daejeon, October, pp. 33-36.

Park, C.H., Huh, S., Kim, H.J. and Yoo, H.S., 2000, “Crustal characteristics and structure of the Ulleung Basin, the East Sea (Japan Sea), inferred from seismic, gravity and magnetic data,” J. of the Korean Society of Oceanography, Vol. 5, No. 2, pp. 95-104.

Yilmaz, O., 2001, Seismic Data Analysis: Processing, Inversion and Interpretation of Seismic Data, 2^nd Ed., Society of Exploration Geophysicists, p. 463.

Yoon, S.H. and Chough, S.K., 1995, “Regional strike slip in the eastern continental margin of Korea and its tectonic implications for the evolution of Ulleung Basin, East Sea (Sea of Japan),” Geological Society of America Bulletin, Vol. 107, No. 1, pp 83-97.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 51
No :6
Pages :845-854
Received Date : 2014-10-06
Revised Date : 2014-12-24
Accepted Date : 2014-12-24
DOI :https://doi.org/10.12972/ksmer.2014.51.6.845

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

All Issue