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双相介质储层的物性参数对地震勘探技术和油气田的开发具有十分重要的意义,由于人造岩心样品具有实验参数可控、性能稳定、重复性好等特点,被广泛应用于地震物理模拟的相关研究.本文对采用石英砂和环氧树脂胶结成型的双相介质人造岩心样品进行了测试分析,主要研究了样品孔隙度及含水饱和度对其声学特性的影响,尤其是讨论了含水饱和度变化对双相介质人造岩心纵、横波速度和弹性参数的影响.实验结果表明,当双相介质人造岩心样品孔隙度小于10%时,纵波波速会随样品含水饱和度的增加而呈现上升趋势;当样品孔隙度介于10%至25%之间时,纵波波速呈现出加速线性上升的趋势;当样品孔隙度大于25%时,纵波波速会先下降,在含水饱和度在0.4~0.5时达到最低值,然后开始上升,逐渐恢复到比含水饱和度为0时略高的范围,而其横波速度随含水饱和度增加未出现明显变化.通过对比双相介质人造岩心饱水前后弹性模量的变化特征,发现泊松比ν是弹性参数中识别流体最敏感的指示因子.
The physical property parameters of the dual-phase media reservoir are of great significance to the seismic exploration technology and the development of the oil and gas fields. Because artificial rock samples have the characteristics of controllable experiment parameters, stable performance and good repeatability, they are widely used in seismic physical simulation In this paper, the dual-phase media artificial quartz samples cemented with quartz sand and epoxy resin were tested and analyzed in this paper. The effects of sample porosity and water saturation on their acoustic properties were studied, especially the changes of water saturation On the longitudinal and shear wave velocities and elastic parameters of two-phase man-made rock, the experimental results show that when the porosity of the two-phase man-made rock sample is less than 10%, the longitudinal wave velocity will increase with the increase of water saturation. When the sample porosity is between 10% and 25%, the longitudinal wave velocity tends to increase linearly. When the sample porosity is greater than 25%, the longitudinal wave velocity decreases first and reaches the lowest when the water saturation is between 0.4 and 0.5 Value, and then began to rise gradually back to a slightly higher range than the water saturation of 0, while its shear wave velocity did not appear with the increase of water saturation Significant changes by comparison of feature variation in elastic modulus before and after the two-phase medium artificial core saturated with water, and ν is Poisson’s ratio of elastic parameters identified in the most sensitive indication of the fluid factor.