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Identifying gas hydrate occurrence state by seismic P-wave attenuation in northern South China Sea
Danqing Dai,Xuewei Liu,Chuanhui Li 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.3
In the process of gas hydrates exploration, the gas hydrate occurrence state is the key factor to determine the exploiting method. In this paper, we find a way to identify gas hydrate occurrence states by seismic P-wave attenuation. We find that the P-wave attenuation characteristics are different between the pore-filling hydrate-bearing sediments and the fracture-filling hydratebearing sediments. The attenuation is prominent in fracture-filling hydrate-bearing sediments. However, the pore-filling hydratebearing sediments have week attenuation effect. We use this difference to identify the gas hydrate occurrences state and apply it in northern South China Sea. The results depict that the P-wave attenuation is an effective attribute to identify gas hydrate occurrence states, which lays a foundation for the identification of gas hydrate occurrence state by seismic P-wave attenuation.
Vibration of elastic and viscoelastic multilayered spaces
Karasudhi, P.,Liu, Y.C. Techno-Press 1993 Structural Engineering and Mechanics, An Int'l Jou Vol.1 No.1
The near field is discretized into finite elements, and the far field into infinite elements. Closed form far-field solutions to three fundamental problems are used as the shape functions of the infinite elements. Such infinite elements are capable of transmitting all surface and body waves. An efficient scheme to integrate numerically the stiffness and mass matrices of these elements in presented. Results agree closely with those obtained by others.