This paper studies the characteristics of ultrasonic propagation in a model of a small pillar of the pore-cave type carbonate rock of different size and shape and distribution and in ultrasonic multi frequency, using the numerical simulation method of two-dimensional ultrasound and physical model experiments, from the perspective of kinematics and dynamics. The results show that in the single pore-cave discontinuous distribution, the size change almost has no effect on the velocity but is correlated with the attenuation coefficient positively; in the case of the same size, with the increase of the test frequency, the velocity increases, with the attenuation coefficient and the frequency in an exponential increasing relation. The influence of the hole shape (round holes or square holes) is related with the porosity. The porosity of 9% is the critical value. When it is less than 9%, the effects can be neglected; when it is more than 9%, the influence of circular holes is greater than that of square holes on the attenuation coefficient. The influence of elliptical holes is related with the aspect ratio, when the aspect ratio is greater than 1, with the increase of the aspect ratio, the attenuation coefficient changes little, whereas the attenuation coefficient varies greatly when the aspect ratio is less than 1. With the increase of the concentration of the pore distribution, the wave velocity decreases linearly, and the attenuation coefficient increases linearly.

carbonate pore model  /  ultrasonic wave  /  wave velocity  /  attenuation coefficient