石油与天然气地质 ›› 2009, Vol. 30 ›› Issue (3): 324-329.doi: 10.11743/ogg20090311

• 西部油气地质 • 上一篇    下一篇

塔东地区天然气地球化学特征及运聚探讨

兰晓东1, 朱炎铭1, 冉启贵2, 程宏岗2   

  1. 1. 中国矿业大学, 资源与地球科学学院, 江苏, 徐州, 221008;
    2. 中国石油天然气股份有限公司勘探开发研究院, 廊坊分院, 河北, 廊坊, 065007
  • 收稿日期:2008-12-31 出版日期:2009-06-25 发布日期:2012-01-16
  • 基金项目:

    国家重点基础研究发展(973)计划项目(2007CB209503).

A discussion on the geochemical characteristics and migration and accumulation of natural gas in the eastern Tarim Basin

Lan Xiaodong1, Zhu Yanming1, Ran Qigui2, Cheng Honggang2   

  1. 1. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China;
    2. Langfang Branch of PetroChina Exploration & Development Research Institute, Langfang, Hebei 065007, China
  • Received:2008-12-31 Online:2009-06-25 Published:2012-01-16

摘要:

塔东地区存在两套烃源岩,根据对样品组分、碳氢同位素及轻烃组分等方面的综合分析,塔东地区天然气属于有机海相油型气,来自于寒武系—奥陶系烃源岩,形成温度较高,属于高温裂解气。结合碳同位素特征和天然气运移指数ΔR3对该区天然气运聚规律进行了探讨,大致方向由构造低部位向构造高部位运移。从英南2井来看,其气藏充注过程至少有两次。

关键词: 同位素组成, 成因类型, 地球化学特征, 天然气运移和聚集, 塔东地区

Abstract:

There are two sets of source rocks in eastern Tarim Basin.Comprehensive analysis of components,isotopes of carbon and hydrogen,and light hydrocarbon constituents of the samples from the basin indicates that natural gas there is marine organic oil-prone gas derived from the Cambrian and Ordovician source rocks.The gas was formed at a very high temperature and therefore can be classified as cracked gas.Study on gas accumulation and migration patterns based on character of carbon isotope and gas migration index(ΔR3) shows that the direction of gas migration is generally from structural low to high.Data of the well Yingnan-2 show that the reser-voirs there had experienced at least two times of hydrocarbon charges.

Key words: isotopic composition, genetic type, geochemical characteristics, gas migration and accumulation, eastern Tarim Basin

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