新疆石油地质 ›› 2006, Vol. 27 ›› Issue (6): 699-702.

• 油气勘探 • 上一篇    下一篇

川中磨溪气田烷烃气组分和碳同位素系列倒转成因

李登华a, 汪泽成b, 李军b   

  1. 中国石油石油勘探开发科学研究院: a.研究生部; b.地质所, 北京 100083
  • 收稿日期:2006-01-16 修回日期:2006-04-20 出版日期:2006-12-01 发布日期:2020-10-21
  • 作者简介:李登华(1972-), 男, 山东金乡人, 在读博士研究生, 石油地质,(Tel) 010-62093647(E-mail) dragon-vip99@163.com.

Origin of Reversal of δ13C Series and Component of Biogenic Alkane Gas in Moxi Gas Field of Central Sichuan

LI Deng-hua1, WANG Ze-cheng2, LI Jun2   

  1. 1. Graduate Department, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    2. Institute of Geology, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2006-01-16 Revised:2006-04-20 Online:2006-12-01 Published:2020-10-21

摘要: 正常状态下, 有机烷烃气的碳同位素值(δ13C) 依碳数递增而递增, 其组分含量依碳数递增而递减, 而川中磨溪气田中三叠统雷口坡组一段气藏, 有机烷烃气的组分含量和碳同位素系列却出现了倒转。通过对混合成因、生物成因、原油裂解成因、运移成因和散失成因等多种可能性的深入分析, 认为该气藏倒转主要是散失成因造成的。相邻的威远气田也存在有机烷烃气碳同位素系列倒转现象, 研究认为可能同样是散失成因导致的。

关键词: 磨溪气田, 烷烃, 碳同位素, 组分, 成因

Abstract: In normal state, δ13C in biogenic alkane gas increases, while its component content decreases, with increase of the carbon numbers. In Section-1 gas pool of Leikoupo formation of Middle Triassic in Moxi gas field of central Sichuan, both of the component content andδ13C series appear reversals. This paper analyzes the possible origins such as mixed origin, biologic origin, oil-cracked origin, migrated origin and leaked origin in detail. It is believed that such reversals in the gas field are primarily resulted from leaked origin. In adjacent Weiyuan gas field such reversals are also found. The research shows that it possibly attributes to the leaked origin.

Key words: Moxi gas field, alkane, carbon isotope, component, origin

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