含水合物沉积物二维声学特性实验研究

发布时间：2018-04-03 21:48

本文选题：天然气水合物　切入点：储层　出处：《中国石油大学学报(自然科学版)》2017年02期

【摘要】：在研制含水合物沉积物二维声学模拟实验装置基础上,获取水合物形成分布及其二维声响应特征。实验结果表明,水合物饱和度小于15%时,随着水合物形成,各层位声速增长较快;水合物饱和度大于15%后,声速增长变慢。水合物形成初期,粗粒沉积物声速稍大于细粒沉积物;水合物形成末期,不同层位声速差异不大,水合物接近均匀分布。水合物形成过程的二维分布与声响应特征为:纵向上离气源较近层位优先形成水合物、声速较大,横向上反应釜周边优先生成水合物,沉积物两侧声速大于内部声速。实验获得含水合物沉积物纵横波速间的经验公式及纵横波波速比与水合物饱和度间的关系。
[Abstract]:Based on the development of a two-dimensional acoustic simulation device for hydrate sediment, the distribution of hydrate formation and the characteristics of its two-dimensional acoustic response were obtained.The experimental results show that when the hydrate saturation is less than 15, the sound velocity increases rapidly with the formation of hydrate, and when the hydrate saturation is greater than 15%, the sound velocity increases slowly.In the early stage of hydrate formation, the sound velocity of coarse sediment is a little higher than that of fine sediment, and at the end of hydrate formation, there is little difference in sound velocity between different layers, and the hydrate is close to uniform distribution.The characteristics of two-dimensional distribution and acoustic response of hydrate formation process are as follows: the gas hydrate is preferentially formed from the gas source in the longitudinal direction and the sound velocity is larger than that of the near layer, and the gas hydrate is formed preferentially at the periphery of the reactor in the transverse direction, and the sound velocity on both sides of the sediment is larger than that on the inside.The empirical formula of longitudinal and shear wave velocities in hydrate sediment and the relationship between velocity ratio of longitudinal and shear waves and hydrate saturation were obtained.
【作者单位】：中国地质大学(武汉)生物地质与环境地质国家重点实验室;中国地质大学(武汉)地球科学学院;国土资源部天然气水合物重点实验室;青岛海洋地质研究所;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家自然科学基金项目(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)
【分类号】：P618.13;P631

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