石油与天然气地质 ›› 1999, Vol. 20 ›› Issue (4): 290-294.doi: 10.11743/ogg19990404

• 油气空间 • 上一篇    下一篇

中国东部幔源CO2气藏的CO2/3He比率及形成机制

许多, 周瑶琪, 朱岳年, 查明   

  1. 石油大学油气资源与环境地质研究所 山东东营 257062
  • 收稿日期:1999-05-15 出版日期:1999-12-25 发布日期:2012-01-16
  • 基金项目:

    石油大学重点科研基金

CO2/3He RATIO OF MANTLE-DERIVED CO2 GAS POOLS AND ITS FORMATION MECHANISM IN EAST CHINA

Xu Duo, Zhou Yiaoqi, Zhu Yuelian, Cha Ming   

  1. Research Institute of Petroleum Source and Environmental, Geology, Petroleum University, Dongying, Shandong
  • Received:1999-05-15 Online:1999-12-25 Published:2012-01-16

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摘要：

我国东部含油气盆地幔源CO2气藏的CO2/3He比率在107-1013之间,与幔源气体脱离玄武岩浆时恒定的CO2/3He比率(2×109～7×109)相比较发生了很大的变化。其中形成于中生代的万金塔CO2气藏,具有109～1013的高CO2/3He比率,而新生代以来形成的黄骅、济阳、苏北、三水等地的幔源CO2气藏,均以107-109的低CO2/3He比率为特征。研究表明,幔源气藏CO2/3He比率的形成受到了幔源气体的释放机制的控制。在玄武岩浆喷溢、侵入为幔源气藏的形成提供大量气源的同时,岩浆房中的幔源气体通过深切岩浆房的断裂通道直接释放,对幔源气藏的形成、幔源气体的补给以及气藏CO2/3He比率等地球化学特征的塑造具有重要作用。同时,我国东部含油气盆地中无机成因CO2气藏的CO2/3He比率特征为气藏的幔源成因提供了新的证据。

关键词: CO2/3He比率, 幔源气, 断裂, 形成机制

Abstract:

CO2/3He ratio of the mantle-derived CO2 gas pools ranges from 107 to 1013 in petroliferous basins in East China.This differs greatly from the constant CO2/3He ratio of 2?109-7?109 of the manile-derived CO2 gas while Separatng from the basalt magma. The CO2/3He ratio of Wanjingta CO2 gas pool formed in Mesozoic in Sogliao Basin ranges from 109-1013, but that of the mantle-derived CO2 gas pools formed since Cenozoic in Huangha, Jiyang, Subei and Shanshui Basins is as low as 107-109. This indicates that CO2/3He ratio of the mande-derived gas pools is controlled by release mechanism of the gases.The eruption and intrusion of the basalt magma provided a large number of gas sources for the formation of the mantle-derired gas pools; the CO2 gas in the magma chamber would release directly along fault-passages which cut the chamber deeply. This played an important role in the formaion, the gas source supplies, the CO2/3He ratio and geochemical properties of the pools. Meantime, characters of CO2/3He ratio of the inomanic origin CO2 gas pools provide a new evidence for its mantle-derived origin.

Key words: CO2/3He ratio, mantle-derived gases, fault, formation mechanism

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