Abstract
To study ultrasound’s attenuation law propagating in shale, we first tested the attenuation rate of ultrasound in air and shale by assembling an experimental device by ourselves. The experimentally measured ultrasonic attenuation coefficient in the air is close to the value obtained from most kinds of literature, so our self-assembled practical device is very reliable. By fitting the experimental data, we found that the average attenuation coefficient of ultrasound in the air is 0.0258 dB/m. The average attenuation coefficient in shale is 0.0657 dB/m. As the ultrasonic power increases, the attenuation coefficient of ultrasound gradually increases. Through calculation and analysis using the ultrasonic intensity formula, we found that the effective propagation distance of ultrasound in shale is about 1.2 m.
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