南海神狐水合物钻探区不同形态流体地震反射特征与水合物产出的关系

doi:10.3969/j.issn.1001-909X.2014.04.003

海洋学研究 ›› 2014, Vol. 32 ›› Issue (4): 19-26.DOI: 10.3969/j.issn.1001-909X.2014.04.003

南海神狐水合物钻探区不同形态流体地震反射特征与水合物产出的关系

杨睿^1,2,3,4, 阎贫^*1, 吴能友^2,3, 乔少华^2,3,4, 苏明^2,3, 梁金强⁵, 郭攀⁶, 霍元媛⁷

1.中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301;
2.中国科学院广州能源研究所,广东广州 510640;
3.中国科学院天然气水合物重点实验室, 广东广州 510640;
4.中国科学院大学,北京 100049;
5.广州海洋地质调查局, 广东广州 510075;
6.陕西天地地质有限责任公司,陕西西安 510075;
7.中石化华北分公司勘探开发研究院, 河南郑州 450000

收稿日期:2013-11-27 修回日期:2014-10-14 出版日期:2014-12-15 发布日期:2022-11-25
通讯作者: *阎贫(1965—),男,研究员,主要从事地震勘探方法和南海地质方面的研究。E-mail:yanpin@scsio.ac.cn
作者简介:杨睿(1980—),男,河北故城县人,助理研究员,主要从事天然气水合物地球物理方面的研究。E-mail:yangrui@ms.giec.ac.cn
基金资助:
国家高技术研究发展计划(863计划)项目资助(2013AA0925010202);国家自然科学基金项目资助(41206047,41202080);中石油创新基金项目资助(S2012040006333)

Seismic reflecting characteristics of fluid and its effect on gas hydrate distribution in the Shenhu Area, South China Sea

YANG Rui^1,2,3,4, YAN Pin^*1, WU Neng-you^2,3, QIAO Shao-hua^2,3,4, SU Ming^2,3, LIANG Jin-qiang⁵, GUO Pan⁶, HUO Yuan-yuan⁷

1. Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
3. Key Laboratory of Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China;
4. University of the Chinese Academy of Sciences, Beijing 100049, China;
5. Guangzhou Marine Geological Survey, Guangzhou 510075, China;
6. Shanxi Tiandi Geological Co., Ltd, Xi'an 710054, China;
7. Research Institute of Exploration and Development, Northern China Branch, Sinopec, Zhengzhou 450000, China

Received:2013-11-27 Revised:2014-10-14 Online:2014-12-15 Published:2022-11-25

摘要/Abstract

摘要： 天然气水合物的分布在很大程度上受到含气流体运移的影响。南海北部陆坡区,尤其是珠江口盆地的白云凹陷,普遍存在流体渗漏的现象,暗示了水合物赋存的良好前景。神狐海域水合物钻探区内的高分辨率地震资料显示,区域内发育大量流体运移通道,在地震剖面上表现为不同形态的地震反射模糊带,根据其形态特征,可以划分为花冠状和穹顶状两大类模糊反射带。模糊反射带的存在意味着研究区内具有良好的含气流体运移条件,能够为甲烷气体的垂向运移提供通道。神狐海域水合物的钻探结果表明,水合物的分布与模糊反射带的分布范围具有良好的空间匹配关系,其中,花冠状地震反射模糊带侧翼部与中尺度正断层相连,促进了含气流体的侧向运移,顶部与可能的微裂隙相通,气体可向上运移至水合物稳定带,形成了水合物藏;而穹顶状地震反射模糊带顶部则通过疑似流体通道与海底沟通,这种结构极易形成气体逃逸而无法形成水合物。因此,不同形态特征的模糊反射带可能对水合物的分布具有一定的指示意义。

关键词: 神狐钻探区, 流体运移, 地震反射模糊带, 花冠状, 穹顶状, 天然气水合物

Abstract: The distribution of gas hydrate is affected greatly by the migration of gas fluid. The leakage of gas fluid is common in the slope of northern South China Sea, especially in the Baiyun Sag in the Pearl River Mouth Basin, which implies good prospect of gas hydrate occurrence. According to high resolution seismic data about the Shenhu Area, large numbers of fuzzy zones with different morphological characteristics were recognized. They were considered to be main channel of free gas and could be classified into two types: corolliform and dome-form. The existence of fuzzy zones implied that there was a good condition for the migration of gas hydrate in this area, which could provide a vertical channel for free gas migration. Drilling results showed that gas hydrate zones were related to special distribution of fuzzy zones. The corolliform fuzzy zones connected with a set of middle size faults, which promoted the free gas moving to the flank area. The top might connect the small crack with which the free gas could move upwards to the gas hydrate stability zone to form gas hydrate. The top of dome-form fuzzy zones might connect to seafloor through the gas fluid crack. This kind structure could cause the free gas escape and therefore could not form the gas hydrate. This classification method could provide a new indicator about gas hydrate distribution.

Key words: Shenhu Area, fluid migration, fuzzy zone on seismic profile, corolliform, dome-form, gas hydrate

中图分类号:

杨睿, 阎贫, 吴能友, 乔少华, 苏明, 梁金强, 郭攀, 霍元媛. 南海神狐水合物钻探区不同形态流体地震反射特征与水合物产出的关系[J]. 海洋学研究, 2014, 32(4): 19-26.

YANG Rui, YAN Pin, WU Neng-you, QIAO Shao-hua, SU Ming, LIANG Jin-qiang, GUO Pan, HUO Yuan-yuan. Seismic reflecting characteristics of fluid and its effect on gas hydrate distribution in the Shenhu Area, South China Sea[J]. Journal of Marine Sciences, 2014, 32(4): 19-26.

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南海神狐水合物钻探区不同形态流体地震反射特征与水合物产出的关系

Seismic reflecting characteristics of fluid and its effect on gas hydrate distribution in the Shenhu Area, South China Sea

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