东沙岛西南泥火山区的地震烃类检测

王潇; 阎贫; 于俊辉; 王彦林

doi:10.3799/dqkx.2020.069

东沙岛西南泥火山区的地震烃类检测

doi: 10.3799/dqkx.2020.069

王潇^{1, 2, 3, 4, ,},
阎贫^{1, 2, 3, , ,},
于俊辉^{1, 2, 3},
王彦林^{1, 2, 3}

1.
中国科学院边缘海与大洋地质重点实验室, 南海海洋研究所, 广东广州 510301
2.
南方海洋科学与工程广东省实验室, 广东广州 511458
3.
中国科学院海洋地质与环境重点实验室, 山东青岛 266071
4.
中国科学院大学, 北京 100049

基金项目:

“科学”号高端用户项目 KEXUE2019G10

中国科学院海洋地质与环境重点实验室开放基金课题 MGE2018KG14

中国科学院海洋地质与环境重点实验室开放基金课题 MGE2020KG01

国家自然科学基金项目 U1901217

国家自然科学基金项目 91855101

国家自然科学基金项目 41876052

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 GML2019ZD0104

广东省特支计划 2019BT02H594

详细信息

作者简介:
王潇(1994-), 男, 硕士研究生, 主要从事海洋地质和地球物理研究.ORCID: 0000-0003-3022-2037.E-mail: wangxiao@scsio.ac.cn

通讯作者:
阎贫, ORCID: 0000-0001-7138-6076.E-mail: yanpin@scsio.ac.cn

中图分类号: P618.13
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-02
- 刊出日期: 2021-02-15

Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island

Wang Xiao^{1, 2, 3, 4
,
,},
Yan Pin^{1, 2, 3
, ,
,},
Yu Junhui^{1, 2, 3},
Wang Yanlin^{1, 2, 3}

1.
Key Laboratory of Ocean and Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Guangzhou 510301, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3.
Key Laboratory of Marine Geology and Environment of Chinese Academy of Sciences, Qingdao 266071, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 近年来通过多道地震、浅剖及海底采样调查在东沙岛西南海域发现了大量喷溢甲烷的泥火山，通过研究泥火山可能会发现含气层，具有重大的油气资源指示意义.一条多道地震剖面显示，在该海域一泥火山MV3附近存在一个具有极性反转的埋藏背斜构造，其振幅绝对值随偏移距增大而增大.为探究该背斜是否含有烃类气体，开展了速度分析、AVO反演和频率吸收衰减分析.结果表明：该极性反转下方存在纵波低速层；该带在截距P及梯度G剖面表现为负值，在P、G交会图中落入第三象限，在横波反射率剖面中表现为正值，在泊松比变化率剖面中表现为高负值；该带高频成分快速衰减，低频成分相对增加.以上多属性特征预示着该带含气，可能与深部甲烷泄露有关.
- 东沙西南 /
- 泥火山 /
- 多道地震 /
- 极性反转 /
- 烃类检测 /
- 石油地质
Abstract: In recent years,a number of methane-venting mud volcanoes have been found in the southwest area of the Dongsha waters from multi-channel seismic,sub-bottom profiling and dredging survey. Studying mud volcanoes has great significance for oil and gas reserves. In this paper,a buried anticline was found near a mud volcano,MV3,with reversed polarity on a multi-channel seismic profile,where the absolute amplitude increases with offset. To detect whether it contains natural gas,velocity analysis,AVO inversion and frequency absorption attenuation analysis were carried out. There is a low P-wave velocity layer under the reflector of reversed polarity. AVO inversion shows that the polarity reversal zone features negative values in intercept and gradient sections,and falls in the third quadrant in P and G cross-plot. The polarity reversal zone features positive in S-wave reflectivity section,and is highly negative in Poisson ratio change rate section. Frequency absorption and attenuation analysis shows rapid energy loss of high frequency and relative increase of low frequency. Multiple attributes point to gas accumulation there,likely associated with the methane seepage from deep.
- southwest to the Dongsha Island /
- mud volcano /
- multi-channel seismic /
- polarity reversal /
- AVO /
- petroleum geology

HTML全文

图 1 测线位置

Fig. 1. Location of survey line

下载: 全尺寸图片幻灯片

图 2 测线MCS2504偏移剖面(a)及局部放大图(b)

蓝色方框为后续速度分析、AVO反演和频率吸收衰减分析实际范围

Fig. 2. The migrated profile of MCS2504 (a) and the snapshot (b)

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图 3 地震CDP道集

Fig. 3. Seismic channel gather

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图 4 极性反转带振幅随偏移距的变化

Fig. 4. The AVO of the polarity reversal zone

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图 5 速度分析实例和层速度剖面(CDP 8900-15000)

图a₁、b₁为速度分析双曲线拟合与反射界面同相轴的关系；图a₂、b₂为速度谱上能量团的拾取，折线拐点(叉号)旁边的每组数据分别为该能量团对应的双程旅行时(ms)、叠加速度(m/s)和层速度(m/s)

Fig. 5. Examples of velocity analysis and interval velocity profile(CDP 8900-15000)

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图 6 P剖面(a)和G剖面(b)(CDP 8900-15000)

Fig. 6. P profile (a) and G profile (b) (CDP 8900-15000)

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图 7 P、G交会图(CDP 9200-9900)

黑色高亮点大部分落在极性反转带处

Fig. 7. P, G crossplot of polarity reversal zone(CDP 9200-9900)

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图 8 (P-G)/2剖面(a)和P+G剖面(b)

Fig. 8. (P-G)/2 profile (a) and P+G profile (b)

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图 9 面积差值法原理示意图

Fig. 9. Schematic diagram of area difference method

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图 10 低频增加剖面(a)和高频衰减剖面(b)

Fig. 10. Low frequency raise profile (a) and high frequency attenuation profile (b)

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图 11 频率衰减梯度原理示意图

Fig. 11. Schematic diagram of frequency attenuation gradient

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图 12 频率衰减梯度剖面

Fig. 12. High frequency attenuation gradient profile

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图 13 MV3处采集到的嗜甲烷生物和碳酸盐岩结核

a.深海管虫b.针状海绵c.菌席d.黄铁矿

Fig. 13. Methanogens and carbonates from MV3

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东沙岛西南泥火山区的地震烃类检测

doi: 10.3799/dqkx.2020.069

作者简介:
王潇(1994-), 男, 硕士研究生, 主要从事海洋地质和地球物理研究.ORCID: 0000-0003-3022-2037.E-mail: wangxiao@scsio.ac.cn

通讯作者:
阎贫, ORCID: 0000-0001-7138-6076.E-mail: yanpin@scsio.ac.cn

计量

Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island

计量

目录

留言板

东沙岛西南泥火山区的地震烃类检测

doi: 10.3799/dqkx.2020.069

作者简介: 王潇(1994-), 男, 硕士研究生, 主要从事海洋地质和地球物理研究.ORCID: 0000-0003-3022-2037.E-mail: wangxiao@scsio.ac.cn

通讯作者: 阎贫, ORCID: 0000-0001-7138-6076.E-mail: yanpin@scsio.ac.cn

计量

出版历程

Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island

计量

出版历程

目录

作者简介:
王潇(1994-), 男, 硕士研究生, 主要从事海洋地质和地球物理研究.ORCID: 0000-0003-3022-2037.E-mail: wangxiao@scsio.ac.cn

通讯作者:
阎贫, ORCID: 0000-0001-7138-6076.E-mail: yanpin@scsio.ac.cn