Abstract Wave propagation in rocks induces fluid pressure gradients and flow between stiff intergranular pores and compliant microfractures. This, in turn, leads to wave anelasticity, i.e., attenuation and velocity dispersion. Three known squirt-flow models attempt to explain this phenomenon. Based on these theories, we reformulate a new one, where we derive the dry-rock moduli on the assumption that the boundary fluid pressure is constant. The new model improves the predictions of the other models, e.g., a better description at high frequencies and the inclusion of permeability effects. The numerical example shows the response due to the characteristic squirt-flow length and fluid viscosity on wave propagation. The reformulated model is applied to experiments made on water-saturated tight sandstones, where the squirt-flow length is determined, showing that it increases with increasing permeability and porosity at full saturation.

中文翻译：

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用于模拟包含柔顺微裂缝的岩石中的波浪非弹性的喷射流理论

摘要 波浪在岩石中的传播引起流体压力梯度，并在坚硬的粒间孔隙和柔顺的微裂缝之间流动。这反过来又导致波无弹性，即衰减和速度色散。三个已知的喷射流模型试图解释这种现象。基于这些理论，我们重新制定了一个新的理论，我们在假设边界流体压力恒定的情况下推导出干岩模量。新模型改进了其他模型的预测，例如，更好地描述了高频并包含了渗透率效应。数值示例显示了由于特征喷射流长度和流体粘度对波传播的响应。重新建立的模型应用于在水饱和致密砂岩上进行的实验，其中确定了喷射流长度，