天然气水合物研究中的AVA方法分析  

Analysis of AVA method for gas hydrate study

作　　者：阮爱国 李湘云[1] 

机构地区：[1]国家海洋局第二海洋研究所国家海洋局海底科学重点实验室,浙江杭州310012

出　　处：《海洋学研究》2006年第4期1-11,共11页Journal of Marine Sciences

基　　金：国家边缘海"973"资助项目(G2000046704)

摘　　要：运用多相介质弹性模量理论并补充了不同情况下的密度计算公式,选取适当的参数,模拟了含水合物沉积物和含游离气体沉积物的地震波速度和泊松比随孔隙度和饱和度的变化规律,并进行了深入分析。通过与完整公式的对比,对AVA常用的反射系数近似计算式的精度进行了讨论,同时分析了地震波速度、泊松比、密度等参数对于BSR反射系数的不同贡献。In this paper the variation regularities of elastic velocities and poisson＇s ratio with porosity and saturation of gas hydrate and free gas are simulated and discussed, based on the approach and supplemented equations of multi-media elastic modulus and proper parameters from previous authors. Through numerical calculation and comparison with the complete formula, the accuracy of the approximate formula for calculation of reflection coefficient often used in AVA method for gas hydrate is discussed. Moreover, the individual contributions from velocity, density and poisson＇s ratio to reflection coefficient of BSR are calculated and analyzed.

关 键 词：天然气水合物 AVA BSR 反射系数 

分 类 号：P744.4[天文地球—海洋科学]