It is shown that rigidity of the medium is a more strain-sensitive parameter than rock density for the elastic wave velocity with the increase in the depth. For assessing the effect of intergrain and fracture porosity, the ratio (in percent) of the measured P-wave velocity in the rock to the velocity in the solid matrix—the “normalized velocity”—is used. The results of the experimental studies have shown that the effect of fractures (faults, rock joints) and intergrain porosity on the propagation velocity of the elastic P-waves is different. The increase in fracture porosity more strongly reduces the P-wave velocity than the increase in intergrain porosity of identical magnitude. It is shown that the propagation velocity of the elastic P-waves in the rocks and model materials depends on the presence and number of cracks (fractures). The possibility of selective assessment of intergrain and fracture porosity in reservoir rocks of the oil and gas fields during their development is demonstrated.

中文翻译：

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岩石和模型材料破裂对纵波传播速度的影响：实验研究

结果表明，随着深度的增加，对于弹性波速度，介质的刚度是比岩石密度更敏感的应变参数。为了评估晶粒间和裂缝孔隙度的影响，使用了岩石中测得的 P 波速度与固体基质中的速度（“归一化速度”）的比率（以百分比表示）。实验研究结果表明，裂缝（断层、岩石节理）和粒间孔隙度对弹性纵波传播速度的影响是不同的。裂缝孔隙度的增加比相同量级的粒间孔隙度的增加更强烈地降低了纵波速度。结果表明，弹性 P 波在岩石和模型材料中的传播速度取决于裂缝（裂缝）的存在和数量。