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    琼东南盆地南部低凸起及其周缘区天然气水合物富集影响因素和成藏模式

    何玉林 梁金强 石万忠 匡增桂 邓炜 王任 徐立涛 杜浩

    何玉林, 梁金强, 石万忠, 匡增桂, 邓炜, 王任, 徐立涛, 杜浩, 2022. 琼东南盆地南部低凸起及其周缘区天然气水合物富集影响因素和成藏模式. 地球科学, 47(5): 1711-1727. doi: 10.3799/dqkx.2021.207
    引用本文: 何玉林, 梁金强, 石万忠, 匡增桂, 邓炜, 王任, 徐立涛, 杜浩, 2022. 琼东南盆地南部低凸起及其周缘区天然气水合物富集影响因素和成藏模式. 地球科学, 47(5): 1711-1727. doi: 10.3799/dqkx.2021.207
    He Yulin, Liang Jinqiang, Shi Wanzhong, Kuang Zenggui, Deng Wei, Wang Ren, Xu Litao, Du Hao, 2022. Influencing Factors and Accumulation Modes of Gas Hydrate in South Low Uplift and Its Surrounding Area of Qiongdongnan Basin. Earth Science, 47(5): 1711-1727. doi: 10.3799/dqkx.2021.207
    Citation: He Yulin, Liang Jinqiang, Shi Wanzhong, Kuang Zenggui, Deng Wei, Wang Ren, Xu Litao, Du Hao, 2022. Influencing Factors and Accumulation Modes of Gas Hydrate in South Low Uplift and Its Surrounding Area of Qiongdongnan Basin. Earth Science, 47(5): 1711-1727. doi: 10.3799/dqkx.2021.207

    琼东南盆地南部低凸起及其周缘区天然气水合物富集影响因素和成藏模式

    doi: 10.3799/dqkx.2021.207
    基金项目: 

    自然资源部海底矿产资源重点实验室项目 KLMMR-2017-A-09

    中国地质调查局项目 .DD20190217

    中国地质调查局项目 DD20190230

    南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项 GML2019ZD0102

    详细信息
      作者简介:

      何玉林(1990-),男,工程师,主要从事石油地质和天然气水合物的研究工作.ORCID:0000-0002-4082-5029.E-mail:heyulin200910@163.com

      通讯作者:

      梁金强,ORCID:0000-0002-8452-3540. E-mail:ljinqiang@21cn.com

    • 中图分类号: P618

    Influencing Factors and Accumulation Modes of Gas Hydrate in South Low Uplift and Its Surrounding Area of Qiongdongnan Basin

    • 摘要: 为了厘清琼东南盆地南部低凸起及其周缘区天然气水合物富集影响因素及成藏模式,利用天然气水合物钻探获取的钻井、测井及2D/3D地震资料,分析了研究区天然气水合物赋存的地质、地球物理特征,探讨了水合物富集控制成藏的影响因素,建立了水合物成藏模式.结果表明:琼东南盆地南部低凸起及其周缘区位于中央坳陷带南坡的深部流体输导优势方向上.多个站位水合物钻探显示,水合物具有分层、多类型储集层的特征.测井上含水合物层段总体具有高电阻率、低声波时差特征.地震剖面分析显示气烟囱顶部气体横向充注现象明显,气体垂向运移受限.研究区水合物的气源兼具微生物成因和热解气成因.断层、气烟囱以及孔‒缝渗漏体系为深层热解气的运移提供了良好的输导条件.浅层块体搬运沉积的快速堆积使得其内部孔隙流体难以迅速排出,从而其孔隙流体压力相比上覆和下伏地层要高,使得下伏流体的垂向输导受阻,形成封盖作用.超压封盖层是研究区多类型储集层水合物主要的控制因素.根据封盖能力的差异性及其对水合物富集程度的影响提出了封闭系统和开放系统两种类型的水合物成藏模式.

       

    • 图  1  琼东南盆地构造单元分区及研究区位置

      Fig.  1.  The geographical location and structural unit division of the Qiongdongnan basin

      图  2  琼东南盆地地质综合柱状图(修改自杨金海等,2019

      Fig.  2.  Schematic stratigraphic column of the study area in the Qiongdongnan basin (modified from Yang et al., 2019)

      图  3  琼东南盆地W01井测井曲线及岩心照片

      Fig.  3.  Logging curves and cores of well W01 in the Qiongdongnan basin

      图  4  琼东南盆地W03井测井曲线及岩心照片

      Fig.  4.  Logging curve and cores of Well W03 in the Qiongdongnan basin

      图  5  琼东南盆地过W01井和W03井地震剖面显示的似海底反射层(BSR)反射特征

      剖面位置见图 1AA’、BB’;其中a、b为过W01井空白剖面,a’、b’为解释剖面

      Fig.  5.  Reflection characteristics of bottom simulating reflector (BSR) in the through-well W01 and W03 seismic profile in the Qiongdongnan basin

      图  6  W01井站位冷泉露头及水合物实物样品

      Fig.  6.  Cold spring outcrops and hydrate samples from well W01

      图  7  琼东南盆地水合物气源成因分析结果(据Liang et al., 2019修改)

      Fig.  7.  Analysis of gas source origin of gas hydrate in the Qiongdongnan basin (modified from Liang et al., 2019)

      图  8  琼东南盆地南部气烟囱及断层地震反射特征

      Fig.  8.  Seismic reflection features of gas chimneys and faults in the southern Qiongdongnan basin

      图  9  琼东南盆地W01井(a)与W03井(b)井-震对比解释的天然气水合物分布特征

      Fig.  9.  Distribution characteristics of gas hydrate interpreted by well-seismic correlation of wells W01 (a) and W03 (b) in Qiongdongnan basin

      图  10  琼东南盆地低凸起及其周缘区天然气水合物发育模式示意

      Fig.  10.  Enrichment pattern of gas hydrate of low uplift and its surrounding area in Qiongdongnan basin

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