骆迪^1,2,,
蔡峰^1,2,,,
吴志强^1,2,
闫桂京^1,2,
杜润林^1,2
1. 自然资源部天然气水合物重点实验室, 中国地质调查局青岛海洋地质研究所, 山东青岛 266071
2. 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266071

基金项目: 国家自然科学基金（41506085），国家自然科学基金国际（地区）合作与交流项目（41210005），中国地质调查局项目（DD20160213）资助


详细信息

作者简介: 骆迪, 女, 1982年生, 助理研究员, 主要从事海洋地球物理及天然气水合物研究.E-mail:luodi0927@sina.com

通讯作者: 蔡峰, 男, 1965年生, 研究员, 主要从事资源评价及油气地质研究, E-mail:caifeng0532@163.com

中图分类号: P631

收稿日期:2018-03-20
修回日期:2018-09-11
上线日期:2019-02-15

The key technologies of marine small scale high resolution multichannel seismic high-precision imaging

LUO Di^1,2,,
CAI Feng^1,2,,,
WU ZhiQiang^1,2,
YAN GuiJing^1,2,
DU RunLin^1,2
1. The Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao Shandong 266071, China
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao Shandong 266071, China


More Information

Corresponding author: CAI Feng,E-mail:caifeng0532@163.com

MSC: P631

--> Received Date: 20 March 2018
Revised Date: 11 September 2018
Available Online: 15 February 2019


摘要
摘要:基于高频震源的海洋短排列、高分辨率多道地震探测方法，具有主频高、频带宽的特点，是海底浅层地质研究，特别是海洋天然气水合物调查等方面的重要手段.针对这种地震探测方法不能有效控制电缆沉放深度、虚反射干扰严重且规律性差以及速度分析精度低带来的成像效果差等问题，研究了基于虚反射走时识别与模拟计算的电缆沉放深度计算方法，获得了检波点的准确沉放深度，为虚反射的有效压制提供了保障；采用基于相似性原理的排列长度放大技术，有效地解决了排列长度较短引起的速度谱能量团不聚焦的问题，提高了速度分析灵敏度，确保了地震资料成像处理精度.实际资料的最终成像处理结果表明，地震波组的信噪比和分辨率高，速度结构合理，BSR特征清晰，为海洋天然气水合物的识别和研究提供了高品质资料.
关键词: 地震分辨率/
剩余时差/
虚反射/
速度分析

Abstract:Marine multichannel small-scale and high-resolution seismic exploration technology, which is based on large energy sparkers, has characteristics of high dominant frequency and wide bandwidth. This technology has become an important tool in marine shallow geological study, marine gas hydrate investigation and so on. However, due to the inherent characteristics of seismic detection technique, it has some problems in high-precision imaging processing, for example cable sinking depth cannot be controlled effectively, ghost is serious and regularity, and the accuracy of stacking velocity analysis is low, which directly affect the imaging processing effect. To solve these problems, this paper studies the calculation method of the cable sinking depth based on the ghost travel time recognition and simulation calculation, which permits to obtain accurate cable sinking depths and provide guarantee for effective suppression of ghost. Spread amplification technology based on similarity theory is employed to effectively improve the sensitivity of velocity analysis, and ensure the accuracy of seismic data imaging. The application of this method to real data shows that the signal-to-noise ratio and high resolution of seismic wave groups are high, the velocity structures are reasonable, and the characteristics of BSRs are more clear than traditional method.
Key words:Seismic resolution/
Residual moveout/
Ghost/
Velocity analysis



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