摘要
研究岩石超声波速度频散规律,为解决测井和室内超声波透射实验之间数据匹配问题提供参考依据。用数值模拟与物理实验方法研究碳酸盐岩的超声波速度频散现象,结果表明:均质型碳酸盐岩不存在速度频散;孔洞型碳酸盐岩出现了较为明显的速度频散,并随着孔洞密度的增大而增大。孔洞结构也会导致声波速度的离散,这种离散随着频率的增大而减小。不同孔洞分布的碳酸盐岩也会出现速度频散现象,但如果这种分布没有改变声波传播的最短路径,声波速度几乎不会发生离散。不同长度碳酸盐岩样品的速度频散现象严重,但是这种频散现象并没有随岩心长度的变化发生改变。碳酸盐岩内部的孔洞结构极易改变声波在岩石中传播的最短路径,而人造孔洞的分布特征、长度并没有引起最短路径的改变。
Ultrasonic velocity dispersion of carbonate rock is studied by numerical simulation and physical experiment in order to unravel the law of ultrasonic velocity dispersion of rock and provide a reference for data matching between logging and indoor ultrasonic transmission experiment.The results show that there is no velocity dispersion in homogeneous carbonate rocks,while the hole-type carbonate rock has obvious velocity dispersion,which increases with the increase of the holes density.The holes structure itself also leads to the dispersion of the acoustic wave velocity and the dispersion decreases with the frequency increases.Velocity dispersion phenomenon occurs in carbonate rocks with different pore distributions.If this distribution does not change the shortest path of sound wave propagation,the acoustic wave velocity will hardly be dispersed.The velocity dispersion of carbonate rocks with different lengths is serious,but this dispersion phenomenon does not change with the core length.The study confirms that the pore structure inside the carbonate rock can easily change the shortest path of acoustic wave propagation in the rock,but the distribution characteristics and length of man-made cavities do not change the shortest path.
作者
朱洪林
陈乔
徐烽淋
邓紫楠
刘洪
王丹
严灵芳
陈春帆
晏黎明
ZHU Honglin;CHEN Qiao;XU Fenglin;DENG Zinan;LIU Hong;WANG Dan;YAN Lingfang;CHEN Chunfan;YAN Liming(Chongqing Technology and Business University, Chongqing 400067, China;Chongqing Institute of Green and Intelligent Technology, CAS, Chongqing 400714, China;Key Laboratory of Mine Geological Disaster Mechanism and Prevention and Control, Xi'an 710054, China;Chongqing Fuling Shale Gas Environmental R&D and Technical Service Center, Fuling 408102, China;Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China;Chongqing Sihe Gas, Fuling 408000, China;Jingjiang Hydrological and Water Resources Survey Bureau, Jingzhou 434099, China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第4期396-405,共10页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
重庆市自然科学基金项目(cstc2018jcyjAX0670,cstc2019jcyj-msxm0749)
重庆市规划和自然资源局科研项目(kj-2020013)
荆江水文水资源勘测局科技项目(2020-01)
矿山地质灾害成灾机理与防控重点实验室开放基金项目。
关键词
碳酸盐岩
超声波
均质
孔洞
速度频散
carbonate rock
ultrasonic
homogenization
hole
velocity dispersion
