Late Pliocene to Quaternary sedimentary facies and stratigraphy of shallow-water contourite deposits in the Hupo Basin,East Sea of Korea     

Hong  Seok-Hwi  Yoo  Dong-Geun  Lee  Gwang-Soo  Kim  Jin Cheul  Yi  Sangheon  Kim  Gil-Young  Bahk  Jang-Jun  Yu  Shin 《Marine Geophysical Researches》2022,43(4):1-18

Marine Geophysical Research - This study entails the characterization of the depositional environment of the Hupo Basin shelf. By means of sedimentary structure analysis, grain size, textures,...  相似文献   

Physical and Acoustic Properties of Gas-bearing Sediments in Jinhae Bay,the South Sea of Korea     

Gwang-Soo Lee  Gwang-Hoon Lee  Soo-Choul Park  Gil-Young Kim  Dong-Geun Yoo 《Marine Georesources & Geotechnology》2013,31(2):96-114

High-resolution seismic survey and sediment core sampling were conducted to investigate acoustic characteristics of gas-bearing sediments in Jinhae Bay, the southeast of Korea. The sediment in Jinhae Bay is mostly homogenous mud deposited after the Holocene transgression. Along with the 410 km of chirp seismic profiling, five piston core samples were collected on the track lines.

Gassy sediments are common and occur widely in the bay. Core samples were analyzed for sediment texture, physical properties (porosity, water content, bulk density, and grain density), acoustic properties (compressional wave velocity and attenuation), and electrical resistivity. X-radiograph image analysis was also performed to observe the shape of degassing cracks. There is no significant downcore variation on physical and sediment textures regardless of existence of gas bubbles. However, compressional wave velocity dramatically decreases from average 1480 to 1380～739 m/s for the cores that penetrate the gas-bearing zones. This is probably due to degassying cracks that developed by escaping gases and free gas bubbles that are still trapped in the cores. Electrical resistivity is the only geotechnical property that increases in the gas-bearing zone where compressional wave velocity abruptly decreases. This indicates the possibility of using both electrical resistivity as an index variable as well as to compressional wave velocity to identify gassy sediment microstructure because there are little changes in texture and composition of sediment.  相似文献