声学深拖系统在海底冷泉调查中的应用  

Application of acoustic deep tow to the cold seep investigation

作　　者：冯强强[1] 温明明[1] 牟泽霖[1] 万芃[1] 郭军[1] 王爱学[2,3] FENG Qiangqiang;WEN Mingming;MU Zelin;WAN Peng;GUO Jun;WANG Aixue(Guangzhou Marine Geological Survey,Guangzhou 510760,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;School of Oceanography,Wuhan University,Wuhan 430079,China)

机构地区：[1]广州海洋地质调查局国土资源部海底矿产资源重点实验室,广东广州510760 [2]武汉大学测绘学院,湖北武汉430079 [3]武汉大学海洋研究院,湖北武汉430079

出　　处：《测绘工程》2018年第8期49-52,59,共5页Engineering of Surveying and Mapping

基　　金：国家专项项目(DD20189310);国土资源部海底矿产资源重点实验室开放基金(KLMMR-2015-A-13);国家重点专项项目(2016YFC0303900)

摘　　要：结合冷泉区天然气羽状流气柱的特征和已有的探测成果,文中使用新型的声学深拖在疑似冷泉点附近开展试验性调查。利用搭载在深拖上的高分辨率侧扫声呐和Chirp型浅地层剖面仪及多波束系统获取冷泉点附近的侧扫声呐数据、海底浅部地层剖面数据及多波束水体数据。3个疑似冷泉在侧扫声呐图像上呈现明显的亮斑,多波束水体数据可探测冷泉并确定冷泉位置,在浅地层剖面数据上可见清晰的声学反射空白带,指示天然气水合物的运移通道,同时在冷泉点3附近还发现一个新的冷泉异常点。研究结果表明,采用深拖作业,结合多种声学技术手段,可对冷泉目标物进行立体声学探测,为冷泉的快速勘查与识别定位提供科学可靠的技术依据,验证先前调查手段和分析方法的正确性。According to the characteristics of the gas hydrate and existing detection results at the suspected cold seep area,a new acoustic deep tow is used to carry out the experimental investigation.Acoustic backscatter data and the shallow stratigraphic profile data are obtained by using the high-resolution side-scan sonar and the Chirp sub-bottom profiler mounted on the deep tow.Three bright spot anomalies caused by the bubble plume appear on the side scan sonar sonogram,which verifies the correctness of the previous investigation and analytical methods.However,a new cold seep anomaly is found near the cold seep point 3.In addition,acoustic voids which indicate the transport channel of the gas hydrate are clearly shown on the shallow stratigraphic profile data.

关 键 词：声学深拖 冷泉 羽状流 侧扫声呐 浅剖 

分 类 号：P631[天文地球—地质矿产勘探]