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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地定北地区上古生界天然气来源

吴小奇1,2，倪春华2，陈迎宾1,2，朱建辉2，李贶2，曾华盛2   

  1. 1.中国石化石油勘探开发研究院四川地区勘探开发研究中心，四川 成都 610041；
    2.中国石化石油勘探开发研究院无锡石油地质研究所，江苏 无锡 214126
  • 收稿日期:2019-02-14 修回日期:2019-03-28 出版日期:2019-06-10
  • 作者简介:吴小奇(1982-)，男，江苏盐城人，高级工程师，博士，主要从事天然气地质与地球化学研究.E-mail：xqwu@163.com.
  • 基金资助:
    国家自然科学基金项目“含膏层系低丰度烃源岩生烃潜力与气源对比：以川西坳陷雷口坡组为例”(编号：41872122)；国家自然科学基金项目“海相含膏盐岩层系烃源岩发育特征与生烃潜力评价”(编号：U1663201)；国家科技重大专项课题“中西部地区碎屑岩层系油气富集规律与勘探方向”(编号：2016ZX05002-006)；中国科学院A类战略性先导科技专项“叠合盆地深层成藏体系与区带评价”(编号：XDA14010402)联合资助.

Source of the Upper Paleozoic natural gas in Dingbei area in the Ordos Basin

Wu Xiao-qi1,2,Ni Chun-hua2,Chen Ying-bin1,2,Zhu Jian-hui2,Li Kuang2,Zeng Hua-sheng2   

  1. 1.Research Center of Exploration and Development in Sichuan Basin,Research Institute of Petroleum Exploration and Production,SINOPEC,Chengdu 610041,China;
    2.Wuxi Research Institute of Petroleum Geology,Research Institute of Petroleum Exploration and Production,SINOPEC,Wuxi 214126,China
  • Received:2019-02-14 Revised:2019-03-28 Online:2019-06-10

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摘要： 定北地区是中国石化在鄂尔多斯盆地的重要探区之一，近年来该区上古生界天然气勘探取得了重要突破，但对该区天然气成因和来源的研究程度偏低，前人对盆地内上古生界天然气是否发生了大规模侧向运移也存在争议。天然气地球化学特征研究表明，定北地区上古生界天然气为典型干气，干燥系数(C1/C1-5)介于0.977~0.986之间，δ13C1值、δ13C2值和δD1值分别为-30.6‰~-28.6‰、-25.9‰~-24.1‰和-191‰~-177‰，CH4、C2H6碳、氢同位素组成均为正序特征。烷烃气碳、氢同位素组成等综合表明，定北地区上古生界天然气为典型煤成气。根据煤成气二阶段分馏模式计算所得RO值与定北地区上古生界烃源岩样品实测RO值一致，表明定北地区上古生界天然气主要来自原地的太原组—山西组烃源岩。位于鄂尔多斯盆地东北部的大牛地气田与定北地区相比，其天然气具有较低的δ13C1值、C1/值1-5和C1/C2+3值及更高的C2/C1值，表现出来自相对较低成熟度的烃源岩的特征而不是运移效应，这表明鄂尔多斯盆地上古生界天然气未发生大规模的侧向运移。

关键词: 鄂尔多斯盆地, 定北地区, 地球化学特征, 天然气成因, 烃源岩, 碳氢同位素

Abstract: The Dingbei area is an important exploratory area in the Ordos Basin for SINOPEC,and natural gas exploration in the Upper Paleozoic strata in the area achieved great breakthrough in recent years.However,the origin and source of natural gas are weakly studied,and there is no consensus on whether the Upper Paleozoic gas in the basin has experienced large-scale lateral migration.Studies on the geochemical characteristics of natural gas indicate that,the Upper Paleozoic natural gas in the Dingbei area is typically dry gas with the dryness coefficient (C1/C1-5) of 0.977~0.986,and the δ13C1,δ13C2,and δD1 values are in the ranges of -30.6‰~-28.6‰,-25.9‰~-24.1‰,and -191‰~-177‰,respectively,with positive carbon and hydrogen isotopic sequence between CH4 and C2H6.Carbon and hydrogen isotope compositions of alkane gas suggest that the Upper Paleozoic gas in the Dingbei area is typically coal-derived gas.The calculated RO values according to the two-stage fractionation mode of coal-derived gas is consistent with the measured RO values of the Upper Paleozoic source rocks,which indicate that the Upper Paleozoic gas in the Dingbei area was mainly derived from in-situ source rocks in the Taiyuan and Shanxi formations.Compared with the Dingbei area,natural gas from the Daniudi gas field in the northeastern Ordos Basin displays lower δ13C1,C1/C1-5 and C1/C2+3 values and higher C2/C1 ratio,suggesting the lower maturity of source rocks rather than migration effect.The Upper Paleozoic natural gas in the Ordos Basin has not experienced large-scale lateral migration.


Key words: Ordos Basin, Dingbei area, Geochemical characteristics, Origin of natural gas, Source rocks, Carbon and hydrogen isotopes

中图分类号: 

  • TE122.1
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