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| 含水合物沉积物二维声学特性实验研究 |
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卜庆涛1,2,3,4,胡高伟3,4,5,业渝光3,4,5,刘昌岭3,4,5,李彦龙3,4,5,李承峰3,4,5,王家生1,2
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(1.中国地质大学(武汉)生物地质与环境地质国家重点实验室,湖北武汉 430074;2.中国地质大学(武汉)地球科学学院, 湖北武汉 430074;3.国土资源部天然气水合物重点实验室,山东青岛 266071;4.青岛海洋地质研究所,山东青岛 266071;5.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,山东青岛266071)
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| 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。 |
| 关键词: 天然气水合物 储层 二维声学特性 饱和度 模拟实验 |
| DOI：10.3969/j.issn.1673-5005.2017.02.008 |
| 分类号::P 631.4 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(41474119,5,41506082,2);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) |
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| Experimental study on 2-D acoustic characteristics of hydrate-bearing sediments |
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BU Qingtao1,2,3,4, HU Gaowei3,4,5, YE Yuguang3,4,5, LIU Changling3,4,5, LI Yanlong3,4,5, LI Chengfeng3,4,5, WANG Jiasheng1,2
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(1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;2.School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao 266071, China;4.Qingdao Institute of Marine Geology, Qingdao 266071, China;5. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China)
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| 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 hydrate-bearing sediments, as well as the correlation between the wave velocity ratio and the hydrate saturation are also obtained. |
| Key words: natural gas hydrate reservoir 2-D acoustic characteristics hydrate saturation simulation experiment |
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