南海海底地震仪异常数据的分析和处理

发布时间：2018-01-29 09:59

本文关键词： 异常数据处理海底地震仪格式转换广角反射/折射地震南海　出处：《地球物理学报》2016年03期 　论文类型：期刊论文

【摘要】：海底地震仪(Ocean Bottom Seismometer,OBS)数据处理至关重要,是获取深部地壳结构的基础与前提.2006年实施OBS2006-2测线时,有2台OBS(OBS03,OBS06)数据出现异常,无法使用.由于海上航次花费巨大,采集到的数据弥足珍贵.本文采用数据格式检查、邻近台站对比分析、重采样等方法,成功地对这2台OBS数据进行了解编处理,得到了这两个台站的综合地震记录剖面;利用上述方法对2011年实施的OBS973-3测线中的异常台站OBS03进行了分析处理,同样得到了OBS03台站的综合地震剖面;通过查看两次海上实验班报发现,OBS2006-2测线之OBS06与OBS973-3测线之OBS03内部Sedis编号相同,为同一台记录仪器,再一次验证上述处理方法正确可行;然后对OBS2006-2测线2个台站进行震相识别与走时拾取后,利用前人纵波速度模型开展了射线追踪与走时模拟.此次对异常OBS数据的重新处理工作,不仅为OBS探测提供了宝贵的数据处理经验,而且将提高OBS2006-2测线地壳结构的可靠性和约束性,具有重要的研究意义.
[Abstract]:Ocean Bottom seismic data processing is very important. It is the basis and prerequisite for obtaining deep crustal structure. When the OBS2006-2 survey line was carried out in 2006, two OBS0 3 OBS06) data were abnormal. It can not be used. Because of the high cost of sea voyage, the collected data is very precious. This paper adopts data format check, contrast analysis of adjacent stations, resampling and so on. The two OBS data are processed successfully and the integrated seismic records of the two stations are obtained. Using the above method, the OBS03 of the anomalous station in the OBS973-3 survey line implemented in 2011 is analyzed and processed, and the synthetic seismic profile of the OBS03 station is also obtained. The OBS06 of the OBS2006-2 line and the OBS03 internal Sedis number of the OBS973-3 line are the same as those of the same recording instrument. The correctness and feasibility of the above methods are verified again. Then the seismic phase identification and walking time pick-up are carried out at 2 stations of OBS2006-2 survey line. Ray tracing and travel time simulation are carried out by using the previous longitudinal wave velocity model. This reprocessing of abnormal OBS data not only provides valuable data processing experience for OBS detection. Moreover, it will improve the reliability and constraint of crustal structure of OBS2006-2 line, which is of great significance.
【作者单位】：中国科学院边缘海地质重点实验室中国科学院南海海洋研究所;中国科学院大学;中海石油(中国)有限公司深圳分公司;
【基金】：国家自然科学基金(91428204;91028002;41306046;41276049;41176053)联合资助
【分类号】：P716.83
【正文快照】： 1引言为了探明南海西北次海盆地壳结构,2006年9—10月,国家海洋局第二海洋研究所与中国科学院南海海洋研究所合作,平行于南海西北次海盆残余扩张脊方向布设并实施了一条深地震测线OBS2006-2(图1),实验中使用了12台海底地震仪(OBS),均为德国产的Sedis IV型短周期自浮式四分量OB

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