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李斌, 顾元, 黄福强, 冯奇坤. 三源多缆高密度地震采集技术在中国海域水合物调查中的应用[J]. 海洋石油, 2021, 41(1): 1-7. DOI: 10.3969/j.issn.1008-2336.2021.01.001
引用本文: 李斌, 顾元, 黄福强, 冯奇坤. 三源多缆高密度地震采集技术在中国海域水合物调查中的应用[J]. 海洋石油, 2021, 41(1): 1-7. DOI: 10.3969/j.issn.1008-2336.2021.01.001
LI Bin, GU Yuan, HUANG Fuqiang, FENG Qikun. Application of Three-source and Multi-cable High-density Seismic Acquisition for Gas hydrate in Offshore China[J]. Offshore oil, 2021, 41(1): 1-7. DOI: 10.3969/j.issn.1008-2336.2021.01.001
Citation: LI Bin, GU Yuan, HUANG Fuqiang, FENG Qikun. Application of Three-source and Multi-cable High-density Seismic Acquisition for Gas hydrate in Offshore China[J]. Offshore oil, 2021, 41(1): 1-7. DOI: 10.3969/j.issn.1008-2336.2021.01.001

三源多缆高密度地震采集技术在中国海域水合物调查中的应用

Application of Three-source and Multi-cable High-density Seismic Acquisition for Gas hydrate in Offshore China

  • 摘要: 由于天然气水合物具有埋藏浅、横向变化快的特点,为了精细刻画天然气水合物矿体,需采用三维高分辨率地震调查技术。该文介绍了在中国海域针对水合物调查首次采用三源多缆的高密度、高分辨率三维地震采集技术。其采集参数为3震源、震源间距25 m、电缆间距75 m、采集面元6.25 m×12.5 m、震源沉放深度5 m、电缆沉放深度6 m。经过三维叠前深度偏移处理,资料信噪比、分辨率较以往资料有了非常大的提高,为水合物矿体研究奠定了基础。

     

    Abstract: The gas hydrates has the characteristics of shallow burial depth and rapid lateral change. In order to accurately describe the boundary of gas hydrate bodies, the three-dimensional high-resolution seismic survey technology is carried out. This paper introduces the high-density and high-resolution 3D seismic data acquisition with three sources and multiple cables, which is firstly used for gas hydrate survey in offshore China. The acquisition parameters are 3 seismic sources with 25 m spacing, the cable spacing is 75 m, the bin size is 6.25 m×12.5 m, the source depth is 5 m and the cable depth is 6 m. After 3D pre-stack depth migration processing, the signal-to-noise ratio and resolution have been greatly improved compared with previous data, laying a foundation for the study of gas hydrate.

     

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