水合物沉积层声波速度模型  

Acoustic velocity model of hydrate bearing sediments

作　　者：张卫东[1] 刘永军[1] 任韶然[1] 王瑞和[1] 刘义兴[1] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2008年第4期60-63,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'863'计划项目(2006AA09A209-3);山东省泰山学者建设基金项目(TSXZ2006-15)

摘　　要：通过试验对不同水合物饱和度下填砂模型的声波速度进行了测量。根据试验结果,考虑水合物的胶结作用及其对声波速度的影响,引入表观岩石骨架速度的概念,保留传统时均方程对声波速度进行体积平均的方法,建立了威利时均方程在水合物层的修正模型。试验结果表明,水合物在形成过程中填充了地层沉积颗粒之间的孔隙,增强了地层的胶结质量,导致水合物地层中声波传播速度提高。理论模型与试验结果吻合较好,该研究为水合物沉积层的声波测井解释提供了依据。Acoustic velocities were measured in sand model with different hydrate saturations. The modified Wyllie-time equation, which inherits the form of volume weighted average, was proposed based on experimental results. The cementation effect and its contribution to acoustic velocity of hydrate were considered and apparent matrix velocity was proposed. The results show that gas hydrate occupies the porosity among rock grains and enhances the cementation quality of sediment, which results in the acoustic velocity of gas hydrate increasing. The results of modified Wyllie-time equation agree well with experimental data. The research could provide basis for the explanation of aeoustic logging in hydrate sediment.

关 键 词：天然气水合物 沉积层 声波速度 威利时均方程 

分 类 号：P631.8[天文地球—地质矿产勘探]