| Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin |
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| 作者姓名： | DING Weiwei DAI Jinxing YANG Chiyin TAO Shizhen HOU LU |
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| 作者单位： | [1]Key Laboratory of Submarine Geoscience of the State Oceanic Administration, Hangzhou 310012 ,China [2]Petroleum Exploration and Development Research Institute, CNPC, Beijing 100083, China [3]Dagang Oil Field of CNPC, Tianjin 300280, China [4]Faculty of Resource and Information Technology. China University of Petroleum. Beijing 102249, China |
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| 基金项目： | Acknowledgements The authors thank Xiao Dunqing and Zhang Weijiang, Dagang 0ilfield of CNPC, for their help during the sampling, and Sun Mingliang, Key Laboratory of Gas-Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, for his help during sample analyses. |
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| 摘 要： | Helium is a trace constituent in natural gases and is the lightest element of all rare gases. Formed during natural nuclear processes, helium is chemically stable. Due to its strong diffusibility and permeability, helium can be used as a very sensitive tracer. Helium has two natural stable isotopes, 3He and 4He. 3He originates from the universal nebulae when the earth was formed, and 4He mainly originates from the radioactive disintegration of elements in the crust, such as U and Th 1]. In…
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| 关 键 词： | 氦同位素 化合物 渤海湾 NWW |
| 收稿时间： | 2005-05-11 |
| 修稿时间： | 2005-05-112005-06-27 |
Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin |
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| DING Weiwei DAI Jinxing YANG Chiyin TAO Shizhen HOU LU.Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin[J].Chinese Science Bulletin,2005,50(22):2621-2627. |
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| Authors: | Weiwei Ding Jinxing Dai Chiyin Yang Shizhen Tao Lu Hou |
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| Institution: | DING Weiwei1, DAI Jinxing2, YANG Chiyin3, TAO Shizhen2 & HOU Lu4 1. Key Laboratory of Submarine Geoscience of the State Oceanic Ad- ministration, Hangzhou 310012 ,China; 2. Petroleum Exploration and Development Research Institute, CNPC, Beijing 100083, China; 3. Dagang Oil Field of CNPC, Tianjin 300280, China; 4. Faculty of Resource and Information Technology, China University of Petroleum, Beijing 102249, China |
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| Abstract: | The authors obtained 30 core samples from 15 wells in Gangxi fault belt, Huanghua Depression. Using a VG5400 mass spectrometer, the helium isotopic compositions in fluid inclusion of these samples were analysed. Interpretation of results suggests a significant amount of mantle-derived helium in the inclusions, which were likely trapped during Neocene. Mantle-derived helium have mostly accumulated in the intersections of the NWW trending Xuzhuangzi and NE trending Gangxi faults, and decreased away from the intersections. This pattern implied a close relationship to the local tectonic setting. Gangxi fault belt experienced intensive neo-tectonic activities in the Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its tectonic status of extensional stress field. Mantle uplift caused the movement of magma that carried mantle-derived gas, and the deep-rooted tension faults provided the passages for the gases to shallow crust levels. High-content abiogenic CO2 pools occurred in the study area, hence, using the helium isotopic compositions is of great significance to the exploration of abiogenic natural gases. |
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| Keywords: | Gangxi fault belt helium isotopic compositions mantle-derived tectonic abiogenic gases |
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