双相介质人造岩心含水饱和度对声学参数影响的研究  

Study on the effect of water saturation on acoustic properties for two phase medium based artificial cores

作　　者：裴宇翀 杨勤勇[1,2] 赵群[1,2] 马中高[1,2] 沈珲 

机构地区：[1]中国石化地球物理重点实验室,南京211103 [2]中国石化石油物探技术研究院,南京211103

出　　处：《地球物理学进展》2017年第3期1236-1242,共7页Progress in Geophysics

基　　金：国家重点基础研究发展计划(973计划)(2014CB239201)资助

摘　　要：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 parameters of two phase medium based reservoirs play an important role in seismic exploration and field development. Due to the advantages of controllable properties,stable performance,and high reproducibility,artificial core samples have been widely applied in the research of seismic physical modelling. In this paper,we studied the properties of the artificial core samples based on quartz sands and epoxy resin,particularly the influence of porosity and water saturation on the acoustic parameters,such as the wave velocities and elastic modulus. When porosity was lower than 10%,the compressional velocity increased along with the water saturation; when porosity was between 10% and 25%,the compressional velocity linearly increased as the water saturation increased; when the porosity was higher than 25%,the compressional velocity firstly decreased to the minimum value（ water saturation of 0. 4 - 0. 5）,then returned to the value that was a little higher than the initial range（ water saturation of 0）. At the same time,the shear velocity showed almost no change as the water saturation increased. By comparing the elastic modulus of dry and water absorbing samples,it was found that the poisson ratio ν was the most sensitive factor among the parameters to identify the fluid.

关 键 词：双相介质 人造岩心 孔隙度 含水饱和度 纵横波速度 弹性模量 

分 类 号：P631[天文地球—地质矿产勘探]