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首页> 外文期刊>Chinese science bulletin >Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin
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Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin

机译：渤海湾盆地黄hua凹陷港西断裂带流体包裹体中的氦同位素组成

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摘要

The authors obtained 30 core samples from 15 wells in Gartgxi fault belt, Hoanghua Depression. Using a VG5400 mass spectrometer, the helium isotopk 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 crest levels. High-content abiogenic CO_2 pools occurred in the study area, hence, using the helium isotopic compositions is of great significance to the exploration of abiogenic natural gases.
机译：作者从黄花De陷Gartgxi断裂带的15口井中获得了30个岩心样品。使用VG5400质谱仪分析这些样品的流体包裹物中的氦同位素组成。结果解释表明，包裹体中存在大量的地幔来源的氦气，这些氦气很可能在新世时期被捕获。地幔来源的氦大部分聚集在西北向徐庄子和东北向冈西断层的交汇处，并从交汇处逐渐减少。这种模式暗示着与当地构造环境的密切关系。赣西断裂带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应力场的构造状态。地幔隆起引起岩浆的运动，岩浆携带着来自地幔幔源的气体，而根深蒂固的张力断层为气体提供了到达浅波峰水平的通道。研究区出现了高含量的非生物CO_2气藏，因此，使用氦同位素组成对非生物天然气的勘探具有重要意义。

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