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논문 기본 정보

자료유형
학술저널
저자정보
김길영 (Petroleum & Marine Resources Division, Korea Institute of Geoscience and Mineral Resources [KIGAM]) 김대철 (Department of Environmental Exploration Engineering, Pukyong National University) 여정윤 (Gematek Corporation) 유동근 (Petroleum & Marine Resources Division, Korea Institute of Geoscience and Mineral Resources [KIGAM])
저널정보
한국음향학회 한국음향학회지 한국음향학회지 제26권 제1호
발행연도
2007.1
수록면
33 - 38 (6page)

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초록· 키워드

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Compressional wave velocity and shear wave velocity were measured for gassy sediments collected from Jinhae Bay, Korea. To distinguish inhomogeneities of gassy sediments, Computed Tomography (CT) was carried out for gassy sediment using CT Scanner. The cored sediments are composed of homogeneous and soft mud (greater than $8{\Phi}$ in mean grain size) containing clay content more than 50%. In depth interval of gassy sediments, compressional wave velocity is significantly decreased from 1480m/s to 1360m/s, indicating that the gas greatly affects compressional wave velocity due to a gas and/or degassing cracks. Shear wave velocity shows a slight increasing pattern from ${\sim}55\;m/s$ in the upper part of the core to ${\sim}58\;m/s$ at 320 cm depth, and then decreases to ${\sim}54\;m/s$ in the lower part of the core containing a small amount of gas. But shear wave velocity in the gassy sediments is slightly greater than that of non-gassy sediments in the upper part of the core. Thus, the Vp/Vs ratio is decreased (from 30 to 25) in gas charged zone. The Vp/Vs ratio is well correlated with shear wave velocity, but no correlation with compressional wave velocity. This suggests that low concentrations of gas have little affects on shear wave velocity. By CT images, the gas in the sediments is mostly concentrated around inner edge of core liner due to a long duration after sediment collection.

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