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南海北部陆坡东沙海域海底丘状体气体与水合物分布

刘斌

刘斌. 南海北部陆坡东沙海域海底丘状体气体与水合物分布[J]. 海洋学报, 2017, 39(3): 68-75.
引用本文: 刘斌. 南海北部陆坡东沙海域海底丘状体气体与水合物分布[J]. 海洋学报, 2017, 39(3): 68-75.
Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.
Citation: Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.

南海北部陆坡东沙海域海底丘状体气体与水合物分布

基金项目: 同济大学海洋地质国家重点实验室开放基金(MGK1406)。

Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea

  • 摘要: 海底丘状体在天然气水合物发育区是一种常见的微地貌,对丘状体的研究有助于理解海底流体渗漏模式以及水合物的赋存规律。本文研究南海北部陆坡东沙海域天然气水合物发育区海底丘状体的特征及其与水合物的关系。研究所用的数据包括准三维多道地震数据、多波束数据以及浅地层剖面数据。在多波束海底地形图上,丘状体表现为局部的正地形,直径大约为300 m,高出周围海底约50 m。浅地层剖面上存在明显的声空白以及同相轴下拉现象,指示了海底丘状体气体的分布以及流体运移的路径。丘状体周围明显的BSR表明局部区域可能发育有水合物,水合物钻探结果也证实了这一推测。三维多道地震剖面上,丘状体正下方存在空白反射区域,这与泥火山的地震反射特征类似。但空白反射区域内存在强振幅能量,而且丘状体正下方存在连续的反射层,这表明该丘状体并非泥火山成因。综合钻探结果以及三维地震成像结果,认为水合物形成过程引起的沉积物膨胀以及海底碳酸盐岩的沉淀是形成该丘状体的主要原因。
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  • 收稿日期:  2016-06-02

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