Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin

DING Weiwei; DAI Jinxin; YANG Shufeng; CHEN Hanlin

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Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin

机译：渤海湾盆地天然气中氦同位素特征及其构造意义

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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 implied 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 reservation 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.

机译：渤海湾盆地天然气中的氦同位素分析表明，其幔源由高3He / 4He比表示。 3He / 4He比值的范围从西向东增大。这种模式暗示着与当地构造环境的密切关系。渤海湾盆地在新生代经历了强烈的新构造活动。广泛的断陷凹陷和强烈的火山喷发表现出其伸展构造。生物成因天然气可以从岩浆中释放出来，并在延伸过程中通过深层断层向上迁移。该地区的构造条件将有利于地幔起源的氦的向上侵入和保留。此外，随着太平洋板块与欧亚板块交汇率的降低，太平洋板块俯冲板块向后滑转并变陡，自然导致地幔流和其他构造活动从西向东迁移，引起同位素变化。氦比率。

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来源
《中国海洋湖沼学报（英文版）》 |2006年第3期|250-254|共5页
作者
DING Weiwei; DAI Jinxin; YANG Shufeng; CHEN Hanlin;
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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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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类海洋学;
关键词
Bohai Bay Basin; helium isotope; mantle-originated gas; tectonic activity;

机译：渤海湾盆地氦同位素地幔成因天然气构造活动;

Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin

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