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在实验室常温常压条件下 ,对砂岩样品声波参数随含水饱和度的变化关系进行了实验研究 ;并根据Gassmann公式对岩样的声波参数进行了计算 ;从中得出声波参数与含水饱和度、孔隙度的关系。将理论与实验对比 ,分析了存在差异的原因。结果表明 ,当砂岩含少量气体时 ,声波参数发生明显变化 ;纵横波速度比和压缩系数均与孔隙度有密切关系 ,并可用于识别气层。
Under laboratory conditions of normal temperature and pressure, the relationship between the acoustic parameters of sandstone and the water saturation was experimentally studied. The acoustic parameters of rock samples were calculated according to the Gassmann formula. The acoustic parameters and water saturation, Porosity. The theoretical and experimental comparison, analysis of the reasons for the difference. The results show that when the sandstone contains a small amount of gas, the acoustic parameters change obviously. The P-wave velocity ratio and compression coefficient are closely related to the porosity and can be used to identify the gas layer.