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流体饱和岩石中地震波衰减和频散的主要原因是波传播引起的孔隙流体流动。在声波频率和超声频率下,衰减的主要原因是不同形状和方向的孔隙之间的局部流作用(孔隙规模)。Gurevich喷射流简化模型是针对颗粒岩的一种简单模型,其所有的参量都能从实验测量中直接获得或估算出。岩石的孔隙空间假设是由颗粒接触面间的塑形孔隙和刚性孔隙组成。经过推导可以得出岩石中与频率有关的复杂的有效体积模量和剪切模量。得出的喷射流模型与Gassmann和Mavko-Jizba方程分别在低频和高频下一致。将此简化模型的计算值与我们的实验获得的数据以及其他模型的计算值进行比较,具有很好的一致性。
The main reason for the attenuation and dispersion of seismic waves in fluid-saturated rocks is the pore fluid flow caused by wave propagation. At sonic frequency and ultrasonic frequency, the main reason for the attenuation is the local flow (pore size) between different shapes and orientations of pores. The Gurevich jet simplification model is a simple model for grain rock, all of its parameters can be directly obtained from experimental measurements or estimated. The pore space of the rock is assumed to be composed of shaped pores and rigid pores between the particle contact surfaces. After derivation, we can get the complex frequency-dependent effective bulk modulus and shear modulus in rock. The resulting jet model is consistent with the Gassmann and Mavko-Jizba equations at low and high frequencies, respectively. The calculated values of this simplified model are in good agreement with the data obtained by our experiments and the calculated values of other models.