Chinese Journal of Oceanology and Limnology

, Volume 24, Issue 3, pp 250–254 | Cite as

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

  • Ding Weiwei
  • Dai Jinxin
  • Yang Shufeng
  • Chen Hanlin


Analysis on helium isotopes in natural gas in Bohai Bay Basin showed their mantle-origin indicated by high3He/4He ratio. The span of3He/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.

Key words

Bohai Bay Basin helium isotope mantle-originated gas tectonic activity 


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Copyright information

© Science Press 2006

Authors and Affiliations

  • Ding Weiwei
    • 1
    • 2
  • Dai Jinxin
    • 1
    • 2
  • Yang Shufeng
    • 3
  • Chen Hanlin
    • 3
  1. 1.Kay Laboratory of Submarine GeoscienceState Oceanic AdministrationHangzhouChina
  2. 2.Petroleum Exploration and Development Research InstituteCNPCBeijingChina
  3. 3.The Department of Earth ScienceZhejiang UniversityHangzhouChina

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