中国石油大学学报（自然科学版）2017，Vol.41Issue(2)：70-79,10.DOI:10.3969/j.issn.1673-5005.2017.02.008
含水合物沉积物二维声学特性实验研究
Experimental study on 2-D acoustic characteristics of hydrate-bearing sediments
摘要
Abstract
In order to obtain the hydrate distribution and 2-D acoustic characteristics of a reservoir,an experimental system was developed to measure the velocity structure of the hydrate-bearing sediment.It is found that when the hydrate saturation is less than 15％,the acoustic velocity in each layer increases rapidly,while with greater than 15％ saturation the acoustic velocity increases slowly.In the first stage of hydrate formation,the acoustic velocity in the coarse sediment is larger than that in the fine sediment.In the final hydrate formation,the acoustic velocities in different layers have little difference,and hydrates are almost evenly distributed in the reservoir.The 2-D hydrate distribution and its acoustic responses during the hydrate formation process show that in the longitudinal direction,the hydrate preferentially forms closely to gas source,thus the acoustic velocity is large in this area.In the transverse direction,the hydrate preferentially forms around the wall of high pressure cells,resulting in larger acoustic velocities than that in the internal sediments.The empirical formula of P-and S-wave velocity in hydratebearing sediments,as well as the correlation between the wave velocity ratio and the hydrate saturation are also obtained.关键词
天然气水合物/储层/二维声学特性/饱和度/模拟实验Key words
natural gas hydrate/reservoir/2-D acoustic characteristics/hydrate saturation/simulation experiment分类
天文与地球科学引用本文复制引用
卜庆涛,胡高伟,业渝光,刘昌岭,李彦龙,李承峰,王家生..含水合物沉积物二维声学特性实验研究[J].中国石油大学学报（自然科学版）,2017,41(2):70-79,10.基金项目
国家自然科学基金项目(41474119,41306065,41506082,41306062) （41474119,41306065,41506082,41306062）
青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2015ASKJ03) （2015ASKJ03）
