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| | Abstract | | Seismic attenuation is a highly variable physical parameter that depends on confining pressure, porosity, degree of fluid saturation, and variations in fluid properties such as elastic modulus, viscosity, and polarity. In our previous paper, we used partially frozen brine grown in unconsolidated sands as a solid-liquid coexistence system to investigate seismic attenuation phenomena. This paper is concerned with the effect of clay contents on attenuation at ultrasonic frequencies. We observed the variations of a transmitted wave, changing its clay contents and quantitatively estimated attenuation for unconsolidated porous material saturated with brine by considering different distances between the source and receiver transducers. The waveform analyses for P-waves indicate that the attenuation increases with increasing clay contents. In order to elucidate the physical mechanism responsible for ultrasonic wave attenuation measured at different clay contents, we employ a poroelastic model to describe the propagation of ultrasonic waves through partially frozen brines. |
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