摘要
为研究介观尺度下斑块饱和对地震波传播规律的影响,对随机斑块饱和孔隙介质模型(Continuous Random Model of Patchy Saturation,简称CRM)进行了研究并提出改进模型MCRM。利用MCRM模型研究了介观尺度下气、水两相流体非均匀饱和时纵波速度频散和衰减特征,并对实验测量的数据进行了模拟分析。结果表明:(1)MCRM与CRM模型的纵波速度高低频极限相同且具有相同的衰减峰值,但前者特征频率增大,衰减曲线收窄;(2)MCRM与White模型有相同的高、低频极限,但MCRM模型的频散曲线变化相对缓慢、衰减峰值稍小;(3)利用MCRM模型能够模拟渗透率、含水饱和度、频率等参数对速度频散和衰减的影响,并能解释实验室测量的高、低孔隙度砂岩频散、衰减数据。该研究成果有助于更好地理解岩石的黏弹性行为,提高定量地震解释的精度。
To study the influence of patchy saturation on seismic wave propagation under mesoscopic scale, we investigate the continuous random model of patchy saturation, usually called CRM for short, and propose modified continuous random model （MCRM）.Dispersion and attenuation characteristics of P-wave in inhomogeneous saturated porous media with gas and water are investigated by MCRM.Then, we compared the simulation results of three models with experimental ones and obtained the following conclusions. MCRM and CRM are provided with the same P-wave velocities at low or high frequency limits and the same attenuation peak, while the characteristic frequency of MCRM gets bigger and the attenuation curve of MCRM is narrowed.MCRM and White＇s model are also with the same P-wave velocities at low or high frequency limits, while dispersion curve of MCRM changes slowly,and attenuation peak of MCRM is slightly smaller. MCRM can simulate the effects of permeability, water saturation and frequency on the dispersion and attenuation and can explain the measured data of sandstone samples with high or low porosity.This study can help to better understand the viscoelastic behavior of rocks and improve the accuracy of quantitative seismic interpretation.
出处
《石油物探》
EI
CSCD
北大核心
2017年第3期319-327,337,共10页
Geophysical Prospecting For Petroleum
基金
国家重点基础研究发展计划(973计划)项目(2014CB239006)和国家科技重大专项课题(2016ZX05046-002)联合资助~~
关键词
随机斑块饱和
孔隙介质
纵波频散特征
统计特征
敏感参数
random patchy saturated, porous media, dispersion characteristic of compressional wave, statistical characteristics, sensitive parameter
