The Physical and Acoustic Property of Gas-Bearing sediments of Yeosu Bay, South Sea of Korea

Kim D. C., Lee G. S., Bae S. H., Kim G. Y., Seo Y. K., Choi D. L., ...More

Journal of the Geological Society of Korea, vol.48, pp.79-91, 2012 (ESCI)

  • Publication Type: Article / Article
  • Volume: 48
  • Publication Date: 2012
  • Journal Name: Journal of the Geological Society of Korea
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Page Numbers: pp.79-91
  • Çanakkale Onsekiz Mart University Affiliated: Yes

Abstract

Analysis of high-resolution seismic profiles and sediment core was conducted to investigate the

physical and acoustic property of gas-bearing sediments in Yeosu Bay, the South Sea of Korea. Acoustic anomalies

associated with shallow gas are widely distributed in the bay and can be divided into two types. Type I has a very

strong and shallow top reflection that is parallel to the seafloor, with acoustic blanking or turbidity of inner

stratigraphy. Type II is characterized by a sharp top reflection along the seafloor. Physical property and textures

of sediment core that penetrate the gas-bearing zones, show no significant downcore variation regardless existence

of gas bubbles. However, velocity dramatically decreases from average 1497 m/s to 1348~1404 m/s at the

gas-bearing zone. C/N ratios (8.3~12.0) of the organic matter in the cored sediments suggests mixed marine and

terrestrial sources.