Influence of water saturation on ultrasonic P-wave velocity in weakly compacted sandstone

International Conference on Science and Applied Science (Engineering and Educational Science) 2016

物理学;工业技术;教育

Niyartama, Thaqibul Fikri^1 ; Fauzi, Umar^2 ; Fatkhan^3

Physics Study Program, Universitas Islam Negeri Sunan Kalijaga Yogyakarta, Jl. MarsdaAdiSucipto No. 1, Yogyakarta

55281, Indonesia^1

Physics of Earth and Complex Systems, ITB, Jl. Ganesha 10, Bandung

40132, Indonesia^2

Geophysics Engineering, ITB, Jl. Ganesha 10, Bandung

40132, Indonesia^3

关键词: Amplitude changes;    Degree of saturations;    Imbibition process;    Influence of water;    Laboratory measurements;    P-wave velocity;    Ultrasonic P-wave velocity;    Water saturations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/795/1/012012/pdf
DOI  :  10.1088/1742-6596/795/1/012012

来源: IOP

【 摘 要 】

Laboratory measurements of Ultrasonic P-wave velocities were conducted in weakly compacted sandstone with varying degree of water saturations. We used P wave transducer at frequency 63 kHz and imbibition technique in order to study the influence of water saturation on the P-wave velocity. Our experiment showed that the P-wave velocity (Vp) was reduced significantly at the beginning of the imbibition process. The variations on travel times and the amplitude changes were detected at any degree of saturation. The first and second amplitude of P wave decreased as water saturation (Sw) increased in the range of 0.1 to 0.6 in B5 sample, the amplitude increased again afterward. The shifting peaks of the signal that indicated attenuation were also observed in the experimental.