Improved Anderson_Hampton acoustic velocity model for marine sandy gas-bearing sediments

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Wang, Y.^1 ; Huang, L.^2 ; Wang, Y.L.^3 ; Cheng, P.^4

State Key Laboratory and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan, Hubei

430071, China^1

College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, Guangxi

541004, China^2

Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei

430010, China^3

School of Civil Engineering and Architechture, Anhui University of Science and Technology, Huainan, Anhui

232001, China^4

关键词: Attenuation factors;    Compressional wave velocity;    Excitation frequency;    Gassmann equations;    Modulus parameter;    Resonance frequencies;    Sensitivity of parameters;    Theoretical foundations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012016/pdf
DOI  :  10.1088/1757-899X/423/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Anderson & Hampton model is an important theoretical foundation for detection of marine shallow gas and identification of gas-bearing sediments. In the acoustic test of sandy gas-bearing sediments, it was found that if the excitation frequency is lower than the bubble resonance frequency, this model overestimates the attenuation of compressional wave velocity of the sediments, and it is difficult to accurately determine the original occurrence status of gas in the sediments by back analysis. The main reason is that the Gassmann equation in Anderson-Hampton model does not accurately describe the modulus parameters of sandy gassy sand sediments. Based on the occurrence characteristics of marine sandy gas-bearing sediments, an improved Anderson-Hampton acoustic velocity model was established by introducing saturation Sr and an attenuation factor reflecting the decay speed of wave speed. The advantage of the new model was pointed out and the sensitivity of parameter was analyzed simultaneously.