Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Study on the Structure of the Korea-Japan Joint Development Zone by Means of Geophysical Data

지구물리 자료를 이용한 한일공동개발구역 일원의 구조 해석

  • Jeongwon Ha (Department of Earth Science, Pusan National University) ;
  • Sik Huh (Korea Institute of Ocean Science & Technology) ;
  • Hyoungrea Rim (Department of Earth Science, Pusan National University)
  • 하정원 (부산대학교 대학원 지구과학과) ;
  • 허식 (한국해양과학기술원) ;
  • 임형래 (부산대학교 대학원 지구과학과)
  • Received : 2023.09.21
  • Accepted : 2024.01.17
  • Published : 2024.02.29
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Abstract

In this study, we analyze the structure of the Korea-Japan Joint Development Zone (JDZ) using gravity, magnetic, and seismic data. Gravity and magnetic data analysis confirmed that the Jeju Basin exhibits low anomalies compared to adjacent areas. We applied the total gradient to the Bouguer anomaly to identify basin boundaries, and computed the analytic signal from the total magnetic anomaly data to enhance the edges of the magnetic anomalies. The Taiwan-Sinzi Belt, exhibits high magnetic anomalies and crosses the center of the JDZ in the northeast-southwest direction; we presume that intrusive rocks are sporadic in the JDZ. The 3D inversion results of the gravity and magnetic data show a strong correlation between magnetic susceptibility and density (i.e. a low-density zone in the Jeju Basin and the Ho Basin, and a high magnetic susceptibility distribution in the Taiwan-Sinzi Belt). Comparison of the density and seismic profiles of the Jeju Basin shows that high densities are associated with sill, horst, and basement highs, whereas low densities are associated with basement low and grabens. These results suggest that interpretations based on seismic, gravity and magnetic data can effectively reveal the subsurface structure of the JDZ.

이 논문에서는 중력, 자력, 및 탄성파 자료를 이용하여 한일공동개발구역(Korea-Japan Joint Development Zone, JDZ)의 구조를 분석했다. 중력과 자력 자료를 분석한 결과 제주 분지 일원에서 낮은 중력 및 자력 이상을 보이는 영역이 확인되었다. 또한, 분지 경계를 확인하기 위하여 부게 이상 자료에 총수평 기울기(total horizontal gradients)를, 그리고 총자기 이상 자료에 어넬리틱 시그널(analytic signal)을 적용한 결과 분지 경계를 확인할 수 있었다. 높은 대자율을 보이는 타이완-신지 벨트는 북동-남서 방향으로 JDZ의 중심을 가로지르고 있으며 관입암체로 추정되는 암상들이 JDZ에 산발적으로 나타난다. 3차원 자력 및 중력 역산 결과는 대자율과 밀도의 높은 상관 관계를 보였다. 제주 분지와 호 분지에서 낮은 밀도 분포를 나타내며 타이완-신지 벨트에서는 높은 대자율 분포를 보여준다. 제주 분지 일원 측선에서 밀도 단면도와 탄성파 단면도를 비교한 결과 높은 밀도는 화성 활동에 의한 암상(sill), 지루(horst), 기반암 상승부와 연관 있으며 낮은 밀도는 기반암이 함몰된 지구(graben)과 연관된 것으로 해석된다. 이 결과는 탄성파 자료와 중자력 자료를 활용한 융합 해석법이 JDZ 일원의 지하구조 특성을 효과적으로 파악할 수 있음을 제시한다.

Keywords

Acknowledgement

JDZ의 탄성파 자료를 제공해 주신 한국석유공사에 감사드립니다. 이 논문은 부산대학교 대학원 지구과학과 하정원의 석사 논문 "중력과 자력 자료를 이용한 한일공동개발구역(JDZ)의 분지구조 연구"를 일부 발췌하였습니다. 이 논문은 2023년도 정부(교육부)의 재원으로 한국연구재단의 램프(LAMP) 사업 지원을 받아 수행된 연구입니다(No. RS-2023-00301938).

References

  1. Blakely, R. J., 1996, Potential theory in gravity and magnetic applications, Cambridge university press, doi: 10.1017/CBO9780511549816
  2. Coordinating Committee for Geoscience Programmes in East and Southeast Asia, Geological Survey of Japan, and AIST, 2021, Magnetic Anomaly Map of East and Southeast Asia, Revised Version (3rd Edition) https://www.gsj.jp/Map/EN/docs/dgm_doc/p03-revised.html
  3. Cordell, L., and Grauch, V. J. S., 1985, Mapping Basement Magnetization Zones from Aeromagnetic Data in the San Juan Basin, New Mexico, The Utility of Regional Gravity and Magnetic Anomaly Maps: Society of Exploration Geophysicists, 181-197, doi: 10.1190/1.0931830346.ch16
  4. Cukur, D., Horozal, S., Lee, G. H., Kim, D. C., Han, H. C., and Kang, M. H., 2011, Structural evolution of the northern East China Sea Shelf Basin interpreted from cross-section restoration, Marine Geophysical Research, 32(3), 363-381, doi: 10.1007/s11001-011-9114-4
  5. Gungor, A., Lee, G. H., Kim, H.-J., Han, H.-C., Kang, M.-H., Kim, J., and Sunwoo, D., 2012, Structural characteristics of the northern Okinawa Trough and adjacent areas from regional seismic reflection data: Geologic and tectonic implications, Tectonophysics, 522-523, 98-207, doi: 10.1016/j.tecto.2011.11.027
  6. Huh, S., 2021, Hydrocarbon potential and future development strategy at the JDZ in the northeastern East China Sea, KSEG Spring 2021 Conference Proceedings, 24. https://sciwatch.kiost.ac.kr/handle/2020.kiost/41973
  7. Ishihara, T., and Uchida, T., 2021, Magnetic Anomaly Map of East and Southeast Asia, Revised Version (3rd Edition), Geological Survey of Japan, Digital Geoscience Map (P-3 Revised), 1-14. https://www.gsj.jp/Map/EN/docs/dgm_doc/p03-revised.htm
  8. KNOC, 2022, Exploration performance by mining area, https://www.knoc.co.kr/images/business/img_sub03_1_2_1.png (December 30, 2022 Accessed).
  9. Lee, G. H., Kim, B., Shin, K. S., and Sunwoo, D., 2006, Geologic evolution and aspects of the petroleum geology of the northern East China Sea shelf basin, AAPG Bulletin, 90(2), 237-260, doi: 10.1306/08010505020
  10. Lee, Y., Yun, H., Cheong, T., Kwak, Y., and Oh, J., 1998, Geochemical characteristics of organic matter in the Tertiary sediments from the JDZ Blocks, offshore Korea, Korean J. Petro. Geol, 6(1), 25-36, (in Korean with English abstract) doi: https://koreascience.kr/article/JAKO199820828326257.page
  11. Letouzey, J., and Kimura, M., 1985, Okinawa Trough genesis: structure and evolution of a backarc basin developed in a continent, Marine and Petroleum Geology, 2(2), 111-130, doi: 10.1016/0264-8172(85)90002-9
  12. Letouzey, J., and Kimura, M., 1986, The Okinawa Trough: Genesis of a back-arc basin developing along a continental margin, Tectonophysics, 125(1), 209-230, doi: 10.1016/0040-1951(86)90015-6
  13. Li, C.-F., Zhou, Z., Ge, H., and Mao, Y., 2009, Rifting process of the Xihu Depression, East China Sea Basin, Tectonophysics, 472(1), 135-147, doi: 10.1016/j.tecto.2008.04.026
  14. Li, Y., and Oldenburg, D. W., 1996, 3-D inversion of magnetic data, Geophysics, 61(2), 394-408, doi: 10.1190/1.1443968
  15. Li, Y., and Oldenburg, D. W., 1998a, 3-D inversion of gravity data, Geophysics, 63(1), 109-119, doi: 10.1190/1.1444302
  16. Li, Y., and Oldenburg, D. W., 1998b, Separation of regional and residual magnetic field data, Geophysics, 63(2), 431-439, doi: 10.1190/1.1444343
  17. Lin, J.-Y., Sibuet, J.-C., and Hsu, S.-K., 2005, Distribution of the East China Sea continental shelf basins and depths of magnetic sources, Earth, Planets and Space, 57(11), 1063-1072, doi: 10.1186/BF03351885
  18. Lun, Y. Q., 1992, Geotectonic Framework of the East China Sea: Chapter 2: Chinese Margin, 17-25. https://archives. datapages.com/data/specpubs/history2/data/a115/a115/0001/0000/0017.htm
  19. Nabighian, M. N., Ander, M. E., Grauch, V. J. S., Hansen, R. O., LaFehr, T. R., Li, Y., Pearson, W. C., Peirce, J. W., Phillips, J. D., and Ruder, M. E., 2005, Historical development of the gravity method in exploration, Geophysics, 70(6), 63ND-89ND, doi: 10.1190/1.2133785
  20. Nabighian, M. N., Grauch, V. J. S., Hansen, R. O., LaFehr, T. R., Li, Y., Peirce, J. W., Phillips, J. D., and Ruder, M. E., 2005, The historical development of the magnetic method in exploration, Geophysics, 70(6), 33ND-61ND, doi: 10.1190/1.2133784
  21. Pavlis, N. K., Holmes, S. A., Kenyon, S. C., and Factor, J. K., 2012, The development and evaluation of the Earth Gravitational Model 2008 (EGM2008), Journal of Geophysical Research: Solid Earth, 117(B4), doi: 10.1029/2011JB008916
  22. Ren, J., Tamaki, K., Li, S., and Junxia, Z., 2002, Late Mesozoic and Cenozoic rifting and its dynamic setting in Eastern China and adjacent areas, Tectonophysics, 344(3-4), 175-205, doi: 10.1016/S0040-1951(01)00271-2
  23. Sandwell, D. T., Harper, H., Tozer, B., and Smith, W. H. F., 2021, Gravity field recovery from geodetic altimeter missions, Advances in Space Research, 68(2), 1059-1072, doi: 10.1016/j.asr.2019.09.011
  24. Sibuet, J.-C., Deffontaines, B., Hsu, S.-K., Thareau, N., Le Formal, J.-P., and Liu, C.-S., 1998, Okinawa trough backarc basin: Early tectonic and magmatic evolution, Journal of Geophysical Research: Solid Earth, 103(B12), 30245-30267, doi: 10.1029/98JB01823
  25. Sibuet, J.-C., and Hsu, S.-K., 1997, Geodynamics of the Taiwan arc-arc collision, Tectonophysics, 274(1-3), 221-251, doi: 10.1016/S0040-1951(96)00305-8
  26. Sibuet, J.-C., Hsu, S.-K., and Debayle, E., 2004, Geodynamic Context of the Taiwan Orogen, Continent-Ocean Interactions Within East Asian Marginal Seas, 127-158, doi: 10.1029/149GM08
  27. Sibuet, J.-C., Letouzey, J., Barbier, F., Charvet, J., Foucher, J.-P., Hilde, T. W. C., Kimura, M., Chiao, L.-Y., Marsset, B., Muller, C., and Stephan, J.-F., 1987, Back Arc Extension in the Okinawa Trough, Journal of Geophysical Research: Solid Earth, 92(B13), 14041-14063, doi: 10.1029/JB092iB13p14041
  28. Son, B., and Lee, H., 2018, 3-D petroleum system modeling of the Jeju Basin, offshore southern, J. Geol. Soc. Korea, 54(6), 587-603, (in Korean with English abstract) doi: 10.14770/jgsk.2018.54.6.587
  29. Su, J., Zhu, W., Chen, J., Ge, R., Zheng, B., and Min, B., 2014, Cenozoic inversion of the East China Sea Shelf Basin: implications for reconstructing Cenozoic tectonics of eastern China, International Geology Review, 56(12), 1541-1555, doi: 10.1080/00206814.2014.951004
  30. Uieda, L., Tian, D., Leong, W. J. A., Jones, M., Schlitzer, W., Grund, M., Toney, L., Frohlich, Y., Yao, J., Magen, Y., Materna, K., Belem, A., Newton, T., Anant, A., Ziebarth, M., Quinn, J., and Wessel, P., 2022, PyGMT: A Python interface for the Generic Mapping Tools(v0.8.0), Zenodo, doi: 10.5281/zenodo.7481934
  31. Wang, B., Doust, H., and Liu, J., 2019, Geology and Petroleum Systems of the East China Sea Basin, Energies, 12(21), 4088, doi: 10.3390/en12214088
  32. Weatherall, P., Tozer, B., Arndt, J. E., Bazhenova, E., Bringensparr, C., Castro, C., Dorschel, B., Drennon, H., Ferrini, V., Harper, H., Hehemann, L., Jakobsson, M., Johnson, P., Ketter, T., Mackay, K., Martin, T., Mayer, L., Mcmichael-Phillips, J., Mohammad, R., and Warnke, F., 2021, The GEBCO 2021 Grid - a continuous terrain model of the global oceans and land, GEBCO, doi: 10.5285/c6612cbe-50b3-0cff-e053-6c86abc09f8f
  33. Yan, Q., and Shi, X., 2014, Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review, Acta Oceanologica Sinica, 33(4), 1-12, doi: 10.1007/s13131-014-0400-2
  34. Zhou, Z., 1989, Characteristics and tectonic evolution of the East China Sea, Chinese Sedimentary Basins, 165-179, doi: https://cir.nii.ac.jp/crid/1572261549155060736