南沙海区珊瑚礁灰岩纵波波速特征及其影响因素 *

doi:10.11978/2020015

热带海洋学报 ›› 2021, Vol. 40 ›› Issue (1): 133-141.doi: 10.11978/2020015CSTR: 32234.14.2020015

南沙海区珊瑚礁灰岩纵波波速特征及其影响因素 ^*

田雨杭^1,^2,³(), 陈忠^1,³(), 黄蔚霞^1,³, 侯正瑜^1,³, 颜文^1,^2,³, 王雪松^1,^2,³

1.中国科学院边缘海与大洋地质重点实验室, 南海海洋研究所, 南海生态环境工程创新研究院, 广东广州 510301
2.中国科学院大学, 北京 100049
3.南方海洋科学与工程广东省实验室(广州), 广东广州 511458

收稿日期:2020-02-03 修回日期:2020-04-07 出版日期:2021-01-10 发布日期:2020-04-09
通讯作者: 陈忠
作者简介:田雨杭(1987—), 男, 黑龙江齐齐哈尔市人, 博士研究生, 主要从事海洋沉积声学研究。email: tyh@scsio.ac.cn
基金资助:
国家自然科学基金项目(41976065);中国科学院战略性先导科技专项(A类)(XDA13010102);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0104);三亚崖州湾科技城管理局2020年度科技计划项目(SKJC-2020-01-012)

P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area

TIAN Yuhang^1,^2,³(), CHEN Zhong^1,³(), HUANG Weixia^1,³, HOU Zhengyu^1,³, YAN Wen^1,^2,³, WANG Xuesong^1,^2,³

1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China

Received:2020-02-03 Revised:2020-04-07 Online:2021-01-10 Published:2020-04-09
Contact: CHEN Zhong
Supported by:
National Natural Science Foundation of China(41976065);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13010102);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0104);The 2020 Research Program of Sanya Yazhou Bay Science and Technology City(SKJC-2020-01-012)

摘要/Abstract

摘要：

珊瑚礁灰岩是孔隙结构复杂、密度变化较大的一类岩石, 但过去对珊瑚礁灰岩纵波波速与孔隙结构的关系及其影响因素研究不够深入。本文测定和分析了南沙海区某岛礁钻孔中珊瑚礁灰岩的纵波波速、孔隙度以及密度特征, 结果显示礁灰岩的纵波波速变化范围为5104~5958m·s^-1, 孔隙度变化范围为1.47%~17.7%, 密度变化范围为2.07~ 2.72g·cm^-3。这些特征表明, 埋藏后的压实作用和重结晶作用, 对珊瑚礁灰岩的孔隙度和密度产生影响。珊瑚礁灰岩弹性波速主要受孔隙度和孔隙结构类型的影响, 礁灰岩横、纵波速比值能有效地确定岩体的结构和稳定性, 因此礁灰岩的声学特性研究成果可为珊瑚岛礁工程建设的稳定性评估提供可靠的数据支撑。

关键词: 珊瑚礁灰岩, 纵波波速, 孔隙度, 孔隙结构, 密度

Abstract:

Coral reef limestone is a kind of rock with complex pore structure and large density variation. The relationships between P-wave velocity and pore structure of coral reef limestone and the influencing factors on acoustic properties, however, are not well studied. The P-wave velocity, porosity, and density of coral reef limestone were measured and analyzed in this study. The results exhibited that the P-wave velocity of coral reef limestone varies between 5104 and 5958 m·s^-1, its porosity varies between 1.47% and 17.7%, and its density varies between 2.07 and 2.72 g·cm^-3. We showed that the porosity and density in coral reef limestone were determined by compaction and recrystallization. In addition, the porosity and pore structure also had an effect on P-wave velocity in coral reef limestone. More importantly, the structure and stability of coral reef limestone can be determined by the ratio of S-wave and P-wave velocities. The acoustic properties of coral reef limestone can provide important support for the stability of engineering.

Key words: coral reef limestone, P-wave velocity, porosity, pore structure, density

中图分类号:

P736.32

田雨杭, 陈忠, 黄蔚霞, 侯正瑜, 颜文, 王雪松. 南沙海区珊瑚礁灰岩纵波波速特征及其影响因素 ^*[J]. 热带海洋学报, 2021, 40(1): 133-141.

TIAN Yuhang, CHEN Zhong, HUANG Weixia, HOU Zhengyu, YAN Wen, WANG Xuesong. P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area[J]. Journal of Tropical Oceanography, 2021, 40(1): 133-141.

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样品编号	孔深/m	横波波速/ (m·s^-1)	纵波波速/ (m·s^-1)	孔隙度/%	密度/ (g·cm^-3)
1	51.41	2533	5289	9.89	2.29
2	303.63	3884	5958	1.47	2.72
3	304.53	2822	5104	17.70	2.07
4	371.03	3474	5770	3.01	2.67
5	741.03	3273	5151	8.24	2.48
6	777.15	3317	5170	6.13	2.50
7	823.25	2531	5268	9.17	2.21
8	849.95	3298	5185	6.68	2.48
9	864.95	3300	5441	5.77	2.36
10	886.45	3464	5411	3.28	2.45

样品编号	孔深/m	横波波速/ (m·s^-1)	纵波波速/ (m·s^-1)	孔隙度/%	密度/ (g·cm^-3)
1	51.41	2533	5289	9.89	2.29
2	303.63	3884	5958	1.47	2.72
3	304.53	2822	5104	17.70	2.07
4	371.03	3474	5770	3.01	2.67
5	741.03	3273	5151	8.24	2.48
6	777.15	3317	5170	6.13	2.50
7	823.25	2531	5268	9.17	2.21
8	849.95	3298	5185	6.68	2.48
9	864.95	3300	5441	5.77	2.36
10	886.45	3464	5411	3.28	2.45

南沙海区珊瑚礁灰岩纵波波速特征及其影响因素 ^*

P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area

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