| Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin |
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| 作者姓名： | 丁巍伟 戴金星 杨树锋 陈汉林 |
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| 作者单位： | Kay Laboratory of Submarine Geoscience State Oceanic Administration Hangzhou 310012 China，The Department of Earth Science Zhejiang University Hangzhou 310027 China，Kay Laboratory of Submarine Geoscience State Oceanic Administration Hangzhou 310012 China，Petroleum Exploration and Development Research Institute CNPC Beijing 100083 China，The Department of Earth Science Zhejiang University Hangzhou 310027 China，The Department of Earth Science Zhejiang University Hangzhou 310027 China，The Department of Earth Science Zhejiang University Hangzhou 310027 China |
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| 基金项目： | Supported by Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX-SW-234) and Key Laboratory Program of CAS (MSGL0609). |
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| 摘 要： | 1 INTRODUCTION Helium is a trace element in natural gas and the lightest element of all rare gases. It is formed during natural nuclear processes and it is chemi- cally stable. Because of its strong diffusibility and permeability, it is used as a very sen…
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| 关 键 词： | 渤海 氦 同位素 天然气 |
| 收稿时间： | 2004-10-18 |
| 修稿时间： | 2005-01-16 |
Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin |
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| Ding Weiwei,Dai Jinxin,Yang Shufeng,Chen Hanlin.Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin[J].Chinese Journal of Oceanology and Limnology,2006,24(3):250-254. |
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| Authors: | Ding Weiwei Dai Jinxin Yang Shufeng Chen Hanlin |
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| Institution: | (1) Kay Laboratory of Submarine Geoscience, State Oceanic Administration, 310012 Hangzhou, China;(2) Petroleum Exploration and Development Research Institute, CNPC, 100083 Beijing, China;(3) The Department of Earth Science, Zhejiang University, 310027 Hangzhou, China |
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| Abstract: | Analysis on helium isotopes in natural gas in Bohai Bay Basin showed their mantle-origin indicated by high 3He/4He ratio. The span of 3He/4He ratio increased from west to east. This pattern im- plied a close relationship to the local tectonic setting. Bohai Bay Basin experienced intensive neo-tectonic activities in the Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its extensional tectonics. Abiogenic natural gas could be released from magmas and migrate upward through deep faults during the extension. Tectonic conditions in the area would favor upward invasion and reser- vation of mantle-originated helium. Furthermore, with decrease of convergence rate between the Pacific and the Eurasia Plate, the subduction slab of the Pacific Plate rolled back and became steeper, resulting in mantle flow and other tectonic activities migrating from west to east in nature, and caused the variation in isotopic helium ratios. |
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| Keywords: | Bohai Bay Basin helium isotope mantle-originated gas tectonic activity |
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