南海北部神狐海域不同类型水道及其天然气水合物成藏的差异

付超, 于兴河, 梁金强, 何玉林, 匡增桂, 金丽娜

付超, 于兴河, 梁金强, 何玉林, 匡增桂, 金丽娜. 南海北部神狐海域不同类型水道及其天然气水合物成藏的差异[J]. 海洋地质与第四纪地质, 2017, 37(6): 168-177. DOI: 10.16562/j.cnki.0256-1492.2017.06.018
引用本文: 付超, 于兴河, 梁金强, 何玉林, 匡增桂, 金丽娜. 南海北部神狐海域不同类型水道及其天然气水合物成藏的差异[J]. 海洋地质与第四纪地质, 2017, 37(6): 168-177. DOI: 10.16562/j.cnki.0256-1492.2017.06.018
FU Chao, YU Xinghe, LIANG Jinqiang, HE Yulin, KUANG Zenggui, JIN Lina. TYPES OF SEA-BOTTOM CHANNELS AND RELATED GASHYDRATE ACCULULATIONS IN THE SHENHU AREA, SOUTH CHINA SEA (SCS)[J]. Marine Geology & Quaternary Geology, 2017, 37(6): 168-177. DOI: 10.16562/j.cnki.0256-1492.2017.06.018
Citation: FU Chao, YU Xinghe, LIANG Jinqiang, HE Yulin, KUANG Zenggui, JIN Lina. TYPES OF SEA-BOTTOM CHANNELS AND RELATED GASHYDRATE ACCULULATIONS IN THE SHENHU AREA, SOUTH CHINA SEA (SCS)[J]. Marine Geology & Quaternary Geology, 2017, 37(6): 168-177. DOI: 10.16562/j.cnki.0256-1492.2017.06.018

南海北部神狐海域不同类型水道及其天然气水合物成藏的差异

基金项目: 

国家自然科学基金项目 41272132

国家专项项目 GZH2011003-05-02-02

详细信息
    作者简介:

    付超,(1992—)男,硕士研究生,从事沉积学研究,E-mail:fuchaopjb@163.com

    通讯作者:

    于兴河(1958—),男,博士,博士生导师,从事沉积学教学与研究工作,E-mail:billyu@cugb.edu.cn

  • 中图分类号: P736.2

TYPES OF SEA-BOTTOM CHANNELS AND RELATED GASHYDRATE ACCULULATIONS IN THE SHENHU AREA, SOUTH CHINA SEA (SCS)

  • 摘要: 2007年和2015年,我国在南海北部神狐海域的水合物钻探结果揭示,水合物在赋存空间上表现为不均匀性。该区域发育多种类型的深水水道,基于水道特征开展不同类型水道的描述,并分析其对水合物成藏差异性的影响,将对该区域水合物的勘探和后续开采具有重要意义。通过地震剖面的综合解释和井震心综合分析,对神狐海域的水道类型进行了划分,探讨了水合物成藏的差异。结果表明,研究区的水道可划分为“V”型、迁移“V”型、“U”型和碟型等4种类型,不同类型水道的水合物赋存特征各异。“V”型和迁移“V”型水道的水合物主要富集在峡谷壁垮塌沉积中,但富存程度较低;“U”型水道的水合物主要富集在谷底沉积和两侧天然堤中;碟型水道的水合物主要富集在水道末端朵体及越岸扇体中。综合解释认为,沉积速率和水流侵蚀速率是造成神狐海域不同类型水道中水合物成藏差异的主要因素。
    Abstract: The drilling data collected from the Shenhu area in the years from 2007 to 2015 reveals that the area is rich in gas hydrate, which is greatly heterogenous in spatial distribution. There are many channels of different kinds developed in the study area. It is significant to study the types of channels and its bearing on gas hydrate accumulation as well as their impacts on future exploration. Through seismic interpretation and integrated analysis of seismic, logging and coring data, we made a classification of channel types and related hydrate accumulations. According to their shape and genesis, there are four kinds of channels: the "V" shaped channel, migrating "V" shaped channel, "U" shaped channel and saucer shaped channel. The characteristics of gas hydrate accumulation depend upon to some extent the types of channels. The gas hydrate reservoir in the "V" shape or migrating "V" shape channels, which usually have low hydrate abundance, are mostly located in the collapse deposits along the canyon wall. As to the "U" shaped channel, gas hydrates are mainly accumulated in the thalweg and levee deposits. In the Saucer shape channels, however, gas hydrates are mainly deposited in the coarse grained sediments of terminal lobes and overbank fans. The sedimentation rate and flow erosion rate are the main factors to the gas hydrate accumulation in variable shape d channels.
  • 致谢: 本次研究数据由广州海洋地质调查局提供,在此对为本次研究提供帮助的林霖、董亦思、单新、唐倩宇、赵晨帆等表示感谢,并且对本文提出宝贵建议的评审专家和编辑老师表示感谢。
  • 图  1   2015年神狐水合物钻探区位置及本次研究中使用的水合物钻探井位置

    a构造分区;b海底地貌;c综合柱状图

    Figure  1.   Location of gas hydrate drilling area in 2015 (study area) and drilling sites used in this study

    图  2   深水水道分类

    (改自Clark等(1996))

    Figure  2.   Classification of channel

    (modified from Clark(1996))

    图  3   Inline方向水合物地震剖面和测井岩心响应

    (a)Well02-Well08--Well19-Well18联井剖面,(b)迁移“V”型水道对应的测井曲线,(c)“V”型水道对应的测井曲线,(d)“U”型水道对应的测井曲线及水合物岩心

    Figure  3.   Integrated logging-seismic profiles and response of gas hydrate

    图  4   剖面方向上水合物地震响应

    (a)剖面300;(b)剖面600;(c)剖面900;(d)剖面1500;(e)剖面1800;(f)-(I)地震放大和解释剖面

    Figure  4.   Seismic reflection characters of gas hydrate along the crossline

    图  5   两种类型V型水道水合物分布特点

    (图中剖面为图 4中局部放大剖面)

    Figure  5.   The gas hydrate distribution in "V" shape channels

    图  6   “U”型水道水合物分布特点

    (图中剖面为图 4中局部放大剖面)

    Figure  6.   Gas hydrate distribution in "U" shaped channels

    图  7   碟型水道水合物分布特点

    (图中剖面为图 4中局部放大剖面)

    Figure  7.   Gas hydrate distribution in saucer shaped channels

    图  8   不同类型水道的水合物成藏差异及其水合物成藏影响因素示意图

    (a)天然气水合物理想成藏模式;(b)温压对水合物影响(改自于兴河(2014));(c)流速和沉积速率对水合物影响

    Figure  8.   Gas hydrate accumulation models for different types of channels and impact factors

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出版历程
  • 收稿日期:  2017-03-02
  • 修回日期:  2017-05-26
  • 刊出日期:  2017-12-25

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