[논문]지구물리 자료를 이용한 한일공동개발구역 일원의 구조 해석

하정원; 허식; 임형래

doi:10.7582/gge.2024.27.1.023

[국내논문] 지구물리 자료를 이용한 한일공동개발구역 일원의 구조 해석
Study on the Structure of the Korea-Japan Joint Development Zone by Means of Geophysical Data

지구물리와 물리탐사 = Geophysics and geophysical exploration, v.27 no.1, 2024년, pp.23 - 36

하정원 (부산대학교 대학원 지구과학과) , 허식 (한국해양과학기술원) , 임형래 (부산대학교 대학원 지구과학과)

초록
AI-Helper

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.

Abstract ▼ AI-Helper

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.

Keyword

표/그림 (12)

그림 Fig. 1. State-of-art exploration of hydrocarbons in Korea and foreign countries. Eight mining blocks established by Korea; image depict sedimentary basins, oil fields, and drilling locations. Red triangles indicate the locations of domestic boreholes, and black circles indicate the locations of boreholes drilled by China and Japan. Modified from (KNOC, 2022).
그림 Fig. 2. Geological s tructure o f the East C hina S ea. Triangles r epresent location of wells d rilled by Korea. The two l ines were submitted by Korea and China to the Commission of the Limits of the Continental Shelf (CLCS) in the UN. The 200-nautical-mile (200NM) line was established by Korea. The line of Tready is the boundary of the northern continental shelf region between Korea and Japan. The Overlapping Claims Area (OCA) of the Heuksan Basin, Socotra Basin, and Jeju Basin is represented by the dark shaded area. Modified from (Zhou, 1989; Lee et al., 2006; Cukur et al., 2011).
그림 Fig. 3. Complete Bouguer anomaly map of the East China Sea (a), JDZ (b), and Jeju Basin (d). (c) The total horizontal gradient (HG) of the Jeju Basin. Black dashed lines in (c) show the high values of HG.
그림 Fig. 4. (a) Regional Bouguer anomaly map of the East China Sea. Residual Bouguer anomaly map of the East China Sea (b), JDZ (d) and Jeju Basin (c).
그림 Fig. 5. Total magnetic anomaly map of the East China Sea (a), JDZ (b), and Jeju Basin (d). (c) The results of applications of the analytic signal in the Jeju Basin.
그림 Fig. 6. The inverted 3D gravity and magnetic model. (a) Constrained with a density range of -0.3 to -0.03 gcm^-3. (b) Constrained with a susceptibility range of 0.07 to 0.11 SI.
표 Table 1. Parameters for inversion.
그림 Fig. 7. (a) The regional density mesh model for regional-residual separation created using forward modeling. (b) Residual anomaly of the Jeju Basin.
그림 Fig. 8. The subsurface density contrast of the Jeju Basin obtained from 3D gravity inversion. Greenish blocks represent lower density zone (< -0.015 gcm^-3) and yellowish blocks represent higher density zone (> 0.002 gcm^-3). The black dashed lines represent the high values of HG, and showing a strong correlation with the boundaries of the lower and higher density zones.
그림 Fig. 9. Horizontal and vertical views of the inverted densities in the Jeju basin. (a) Horizontal plane views of 2 km and 5 km depths. (b) L1- L1' vertical cross-section indicated by a white line on the right panel of (a). The location A and B show high density contrasts.
그림 Fig. 10. Interpretation of the multi-channel seismic profiles for seismic stratigraphic, geotectonic, and hydrocarbon distribution in the Jeju basin. The colored solid lines indicate the interpreted paleo-horizons of the Pleistocene, Pliocene, Late Miocene, Middle Miocene, Early Miocene, Oligocene, and Eocene structures as well as the Acoustic Basement. The horst (basement high) and graben/half-graben (basement low) structures, which were seen bordering the fault, are indicated by the block solid lines, and yellow and orange solid lines show volcanic edifices.
그림 Fig. 11. Superimposition of density contrast upon the seismic cross-section of L1-L1' profile shows that the two data are strongly correlated. The L1-A region is characterized by basement high, thin sedimentary layer, and multiple volcanic edifices, and has a highly positive density contrast. The A-B region shows the zones between the edges with a large density gradient. The A-B region is characterized by basement low, thick sedimentary layers, and volcanic edifices, and has a highly negative density contrast.

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