珠江口外伶仃洋海底含气沉积物声波反射及衰减特征

阚光明; 刘保华; 张维冈; 李官保; 李西双

珠江口外伶仃洋海底含气沉积物声波反射及衰减特征

1.
中国海洋大学, 海洋地球科学学院, 山东, 青岛, 266003;国家海洋局第一海洋研究所, 山东, 青岛, 266061;国家海洋局第一海洋研究所, 国家海洋局海洋沉积与环境地质重点实验室, 山东, 青岛, 266061;1. 中国海洋大学, 海洋地球科学学院, 山东, 青岛, 266003
2.
国家海洋局第一海洋研究所, 山东, 青岛, 266061;国家海洋局第一海洋研究所, 国家海洋局海洋沉积与环境地质重点实验室, 山东, 青岛, 266061
3.
中国海洋大学, 海洋地球科学学院, 山东, 青岛, 266003

基金项目: 国家“八六三”计划项目(2008AA09Z305);国家“八六三”计划项目(2007AA09Z209);国家自然科学基金资助项目(40576033)

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出版历程
- 收稿日期: 2007-07-12
- 修回日期: 2007-10-10

Acoustic reflection and attenuation characteristics of gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary in China

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266003, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, Chnia1. College of Marine Geosciences, Ocean University of China, Qingdao 266003, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, Chnia
3.
College of Marine Geosciences, Ocean University of China, Qingdao 266003, China

摘要

摘要: 高分辨率地震剖面显示,在珠江口外伶仃洋海底有大面积含气沉积物。根据含气沉积物地震反射特征将其分为声学空白、声学幕、声学扰动、不规则强反射顶部和相位下拉等类型。对含气沉积物声波衰减初步分析表明约在3.3kHz附近有一衰减峰值,将实际资料与理论模型计算进行对比,认为此峰值频率对应于等效半径约6mm的气泡的特征振荡频率,此等效半径气泡的阻尼振荡是引起声波衰减的主要原因。
- 含气沉积物 /
- 声波反射特征 /
- 声波衰减 /
- 外伶仃洋
Abstract: High-resolution seism ic profiles indicate that there is a large area of seafloor gas-containing sediment in the outer Lingding Bay of the Zhujiang Estuary. According to the seismic reflection characteristics of gas-containing sediment,the seismic features of shallow gas are divided into five types:an acoustic blanket,an acoustic curtain,acoustic turbidity,anirregular strong topreflection boundary,and a reflection phase pull-down. The acoustic at tenuation of ga-scontaining sediment is primarily analyzed. The result indicates that there is an attenuation peak near the frequency of 3.3 kHz. According to the comparison between surveying data and model results,it is demonstrated that the attenuation peak frequency corresponds to the fundamental resonance frequency of bubbles with 6 mm equivalent radium. The primary conclusion is drawn that the acoustic attenuation is mainly caused by the damping reso nance of bubbles with the 6 mm equivalentradium.
- gas-containing sediment /
- acoustic reflection characteristics /
- acoustic attenuation /
- outer Lingding Bay in China

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