• Title, Summary, Keyword: 울릉분지

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Geochemistry of Shallow gases taken from the core sediments in the southeastern Ulleung Basin (울릉분지 남동부 시추 퇴적물 내에 함유되어 있는 천부가스의 특성)

  • Lee Young joo;Huh Shik;Kwak Young hoon;Kim Hag ju;Chun Jong Hwa;Jun Sang Joon;Yoo Hai Soo
    • The Korean Journal of Petroleum Geology
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    • v.7 no.1_2
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    • pp.35-40
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    • 1999
  • Chemical and isotopic compositions of hydrocarbon gases were analyBed to characterize the properties of the shallow gases distributed in the southeastern part of the Ulleung Basin, offshore Korea. Sediments from the core were also analyzed to determine the characteristics and relationship to shallow gases. Hydrocarbon gases in the sediments consisted of methane (697.9-6054.4 ppm), ethane, propane, butane and hexane. The total carbon content of the sediments ranges from 1.84fe to $5.11{\%}$ and the total organic carbon content ranges from $0.29{\%} \;to\; 2.65{\%}$. High C/N ratio (>10) indicates that input of terrestrial organic matter was prevalent at the time of deposition. The methane content and stable isotopic data indicate that hydrocarbon gases from the sediments are identified to be thermogenic gas and mixture of both biogenic and thermal gases. Based on the Rock-Eval and carbon isotopic data, the level of thermal maturity of organic matter in the sediments $(Tmax<425^{\circ}C)$ is lower than that of gas. It suggests that thermal gases in the sediments migrated from the deeper sediments than the penetrated depth.

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Dioctahedral Chlorite-Smectite Mixed-Layer Minerals in the Sandstones of the Ulleung Basin, Offshore SE Korea (울릉분지 사암 내에 발달된 이팔면체 녹니석 - 스멕타이트 혼합층 광물)

  • Son Byeong-Kook
    • Journal of the Mineralogical Society of Korea
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    • v.18 no.2
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    • pp.73-81
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    • 2005
  • Mineralogical and chemical examinations were performed on chlorite-smectite mixed layer minerals that occur in the sandstones from a petroleum exploration well in the southern part of the Ulleung Basin. X-ray diffraction and chemical analyses show that the chlorite-smectite mixed layer mineral is tosudite, a 1 : 1 R1 ordered interstratification of chlorite and smectite with an overall dioctahedral character. This mineral is almost the same as the tosudite reported from hydrothermally-altered regions, which is rich in Li. This fact indicates that the tosudite area may be affected by hydrothermal events, because the studied well is located in the tectonically-deformed area, in which lots of trust faults and folds are present. In these respects, the formation of tosudite is probably due to the variable effect of hydrothermal fluids from the deeper part of the area.

3D Spatial Distribution Modeling for Petrophysical Property of Gas Hydrate-Bearing Sediment using Well Data in Ulleung Basin (울릉분지 시추공 분석 자료를 이용한 가스하이드레이트 함유층의 3차원 공간 물성 분포 추정)

  • Lee, Dong-Gun;Shin, Hyo-Jin;Lim, Jong-Se
    • Journal of Energy Engineering
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    • v.22 no.2
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    • pp.156-168
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    • 2013
  • Drilling expedition #1 in 2007 and drilling expedition #2 in 2010 were performed for gas hydrate resources evaluation and optimal site selection of pilot test in Ulleung basin, East Sea, Korea. This study presents to build the 3D spatial distribution models using the estimated sedimentary facies, porosity, and gas hydrate saturation derived by well logs and core analysis data from UBGH1-4, UBGH1-9, UBGH1-10, UBGH1-14, UBGH2-2-1, UBGH2-2-2, UBGH2-6, UBGH2-9, UBGH2-10 and UBGH2-11. The objective of 3D spatial distribution modeling is to build a geological representation of the gas hydrate-bearing sediment that honors the heterogeneity in 3D grid scale. The facies modeling is populating sedimentary facies into a geological grid using sequential indicator simulation. The porosity and gas hydrate saturation modeling used sequential Gaussian simulation to populate properties stochastically into grid cells.

Dissolved Copper and Nickel in the surface water of East Sea, Korea (동해 표층수중 용존 Cu, Ni의 분포 특성)

  • Yoon, Sang Chol;Yoon, Yi Yong;Suh, Young Sang
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.17 no.4
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    • pp.257-267
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    • 2014
  • The distributions of trace metals in the East Sea were investigated during the R/V Lavrentyev cruise (July 2009) in which four transects from Russia shore to South were conducted to collect 25 surface water samples. The total dissolved concentrations of Cu and Ni were measured using ICP-MS, DRC-e. In the coastal area, their concentrations of Russia shore (Cu, 1.51; Ni, 1.82 nM) were 1.9 times for Cu and 2.0 times for Ni lower than Korea shore (Cu, 2.87; Ni, 3.71 nM). In the subregion, their concentrations of Warm region (Cu, 3.03; Ni, 2.28 nM) were higher for Cu than Cold region (Cu, 2.04; Ni, 2.28 nM). The distributions of Cu and Ni concentrations were divided by lowest level at $10^{\circ}C$ of water temperature. In this study period, the surface water temperatures of Russia shore and Japan basin were lower than $10^{\circ}C$ and them of Ulleung basin and Sakhalin shore were higher. Below $10^{\circ}C$, Cu and Ni concentrations increased when surface water temperatures decreased. Above $10^{\circ}C$, their concentrations increased with temperature, which showed highest concentrations in the Ulleung basin, directly influenced by flux from East Korean Warm Current. By comparing with other sea areas (Western Mediterranean, Atlantic), Cu concentrations in the East Sea were a little higher and Ni concentrations were lower. Particularly as the level of Cu in the offshore in the Ulleung basin were higher than in the coastal area, We can suggest that the atmospheric flux of Cu is relatively important in this area.

Sediment Characteristics of Waste Disposal Sites in the Southwestern UUeung Basin, the East Sea (동해 울릉분지 남서해역 해양투기장의 퇴적물 특성)

  • Chun, Jong-Hwa;Huh, Sik;Han, Sang-Joon;Shin, Dong-Hyeok;Cheong, Dae-Kyo;Hong, Ki-Hoon;Kim, Suk-Hyun
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.4 no.4
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    • pp.312-322
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    • 1999
  • We have studied both submarine morphology and sediment characteristics of waste disposal sites in the southwestern Ulleung Basin, East Sea, as part of a marine environmental preservation program. The Jung waste disposal site in the outer shelf is characterized by the thick accumulation of coarse-grained palimpsest sediments and fine-grained sediments from various sources. The Byung waste disposal site in the continental slope is generally characterized by hemipelagic muds with intermittent sandy sediments originated from the outer shelf and upper slope. The hemipelagic sediments, draping the seafloor, consist of fluidized muds. The core sediments show numerous bioturbation structures which cause vertical mixing of sediments. The surface sediments can be divided into four sand types (S-1, S-2, S-3, and S-4) and two mud types (M-1 and M-2) based on relative contents of reworked coarse-grained palimpsest sediments and fine-grained sediments. sorting and heavy mineral contents. The sands are probably relict sediments reworked during high-energy conditions such as typoon or storm. On the other hand, the muds were originated from various sources such as recent input from the Nakdong River, reworked fine-grained sediment from the shelf or suspended particulate matter from the East Sea Warm Current.

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