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

Volume 46 Issue 2

Feb. 2021

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Wang Xiao, Yan Pin, Yu Junhui, Wang Yanlin, 2021. Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island. Earth Science, 46(2): 621-631. doi: 10.3799/dqkx.2020.069

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Wang Xiao, Yan Pin, Yu Junhui, Wang Yanlin, 2021. Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island. Earth Science, 46(2): 621-631. doi: 10.3799/dqkx.2020.069

Wang Xiao, Yan Pin, Yu Junhui, Wang Yanlin, 2021. Seismic Detection for Hydrocarbon in Mud Volcano-Rich Area Southwest to the Dongsha Island. Earth Science, 46(2): 621-631. doi: 10.3799/dqkx.2020.069

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

doi: 10.3799/dqkx.2020.069

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

Received Date: 2020-01-02
Publish Date: 2021-02-15

Abstract

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

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

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