随机斑块饱和孔隙介质模型研究

发布时间：2018-07-22 15:59

【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。
[Abstract]:In order to study the effect of patch saturation on seismic wave propagation at mesoscopic scale, the continuous Random Model of Patchy saturation (CRM) was studied and an improved model, MCRM, was proposed. In this paper, the dispersion and attenuation characteristics of longitudinal wave velocities in mesoscopic gas and water two-phase fluids with non-uniform saturation are studied by using MCRM model, and the experimental data are simulated and analyzed. The results show that: (1) the P-wave velocities of MCRM and CRM are the same and have the same attenuation peak, but the characteristic frequency of the former increases and the attenuation curve narrows; (2) MCRM and White have the same high and low frequency limit. However, the dispersion curve of MCRM model changes relatively slowly, and the attenuation peak value is slightly small. (3) the influence of permeability, water saturation, frequency and other parameters on velocity dispersion and attenuation can be simulated by using MCRM model, and the height of laboratory measurement can be explained. Low porosity sandstone dispersion, attenuation data. The results are helpful to better understand the viscoelastic behavior of rock and improve the accuracy of quantitative seismic interpretation.
【作者单位】：中国石油天然气股份有限公司勘探开发研究院;
【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~~
【分类号】：P631.4

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