项目名称: 含水合物沉积物的声传播特性及多相介质声学模型研究
项目编号: No.41276043
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 天文学、地球科学
项目作者: 李栋梁
作者单位: 中国科学院广州能源研究所
项目金额: 78万元
中文摘要: 天然气水合物是一种储量巨大的潜在的替代能源,而含水合物沉积物的声学特性是水合物储层重要的岩石物性,也是水合物勘探开发的重要基础,其声学特性及物理模型已有很多研究,但还存在一些问题,例如没有考虑温度的影响,也很少研究气、水、水合物、沉积物等多相介质的相互作用,导致在实际应用中还存在很多问题。本项目将根据天然气水合物的特点建立一套可在线测量水合物声学参数的实验装置;通过实验研究和理论分析获取含水合物的南海水合物钻探区沉积物及青藏高原冻土的声波传播速度及声阻抗数据及其关键影响因素,探索天然气水合物存在条件下的多相介质声波传播特性,阐明其声传播机制;在现有双相介质理论、Hertz-Mindlin接触理论及Dvorkin等的胶结理论的基础上引入温度等参数,考虑Biot慢波及频散的影响,建立多相介质的声传播模型,并利用模型和南海水合物钻探过程中的测井数据反演水合物饱和度的分布。
中文关键词: 水合物;沉积物;声速;模型;
英文摘要: Natural gas hydrate is an alternative energy sources with enormous reserves, and the acoustic characteristics of hydrate-bearing sediments is important to hydrate reservoir rock properties for hydrate exploration and development. A lot of research has been performed about acoustic characteristics and physical model of hydrate-bearing sediments, but there are still some problems. For example, they did not consider the influence of temperature and the interaction of multi-phase medium of gas, water, hydrate and sediment. It, therefore, results in a lot of problems in practical applications. Base on the characteristics of gas hydrate, this project will establish a set of the experimental setup with online measurement of the hydrate acoustic parameters to get the acoustic impedance data and study the key factors which influence the acoustic wave velocity of the hydrate-containing sediments in the hydrate drilling district of the South China Sea hydrate and the Qinghai-Tibet Plateau permafrost by experimental and theoretical analysis, explore acoustic wave propagation characteristics of multiphase media under the presence of natural gas hydrates, clarify its sound propagation mechanism, and establish Multiphase medium model. Base on the two-phase medium theory, Hertz-Mindlin contact theory and Dvorkin cementation the
英文关键词: gas hydrate;sediment;acoustic velocity;acoustic model;