Predicting the acoustic characteristics of seafloor sediments containing cold spring carbonate rocks
Predicting the acoustic characteristics of seafloor sediments containing cold spring carbonate rocks
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DOI：
10.3389/fmars.2023.1243780
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发表时间：
2023-08
影响因子：
3.7
通讯作者：
Yuhang Tian;Lei Wu;D. Zou;Zhong-rong Chen;Yongjun Jiang;P. Yan;C. Fan
中科院分区：
文献类型：
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作者：
Yuhang Tian;Lei Wu;D. Zou;Zhong-rong Chen;Yongjun Jiang;P. Yan;C. Fan
对取自南海潮汕凹陷的两个有价值的海相冷泉碳酸盐岩样品进行了声学和物理特性测量。应用Wyllie时均方程分析了不同孔隙度下的实测声速及其变化趋势，发现海相冷泉碳酸盐岩的声速与陆相碳酸盐岩的声速一致。采用Voigt模型、Reuss模型和Voigt-Reuss-Hill模型预测了含有冷泉碳酸盐矿物颗粒或岩石的海底沉积物四种状态的声速特征。对于存在于海底沉积物之上或之中的海洋冷泉碳酸盐矿物颗粒的这四种状态，含有冷泉碳酸盐矿物颗粒或岩石的海底表层沉积物混合物的声速和反射系数随着海底沉积物体积比的增加而减小。这种反射系数预测方法为解释冷泉渗流区Chirp次底剖面观测到的高反射系数和低反射系数提供了证据。
The acoustic and physical properties of two valuable marine cold spring carbonate rock samples gathered from the Chaoshan Depression in the South China Sea were measured. The Wyllie time-average equation was applied to analyze the measured sound speeds and their trend under different porosities, and the sound speeds of marine cold spring carbonate rocks were found to be consistent with those of terrestrial carbonate rocks. The Voigt model, Reuss model, and Voigt-Reuss-Hill model were used to predict the characteristics of the sound speed for four states of seafloor sediments containing cold spring carbonate mineral particles or rocks. For these four states of marine cold spring carbonate mineral particles existing on or in seafloor sediments, the sound speed and reflection coefficient of a mixture of seafloor surface sediments containing cold spring carbonate mineral particles or rocks decrease with an increase in the volume ratio of the seafloor sediment. This method for predicting the reflection coefficient provides evidence to explain the high and low reflection coefficients observed in Chirp sub-bottom profiles of cold spring seepage areas.