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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

中国西北地区侏罗系煤成气地球化学特征与勘探潜力

李剑1,2,郝爱胜1,2,齐雪宁1,2,陈旋3,国建英1,2,冉启贵1,2, 李志生1,2,谢增业1,2,曾旭1,2,李谨1,2,王瑀1,2,4，刘如红1,2,4   

  1. 1.中国石油勘探开发研究院天然气地质所，河北 廊坊 065007；
    2.中国石油天然气集团公司天然气成藏与开发重点实验室，河北 廊坊 065007；
    3.中国石油吐哈油田分公司勘探开发研究院，新疆 哈密 839009;
    4.中国科学院大学，北京 100049
  • 收稿日期:2019-05-01 修回日期:2019-05-28 出版日期:2019-06-10
  • 通讯作者: 郝爱胜（1987-），男，山东聊城人, 工程师，硕士，主要从事天然气成藏研究. E-mail:haoas2012@petrochina.com.cn
  • 作者简介:李剑（1966-），男，河北怀安人，教授级高级工程师，博士生导师，主要从事天然气地球化学与成藏研究.E-mail：lijian69@petrochina.com.cn.
  • 基金资助:
    “十三五”国家科技重大专项项目“大气田富集规律与勘探关键技术”（编号：2016ZX05007）；中国石油股份公司“十三五”科技重大项目“大中型天然气田（区）勘探关键技术及目标评价”（编号：2016B-06）联合资助.

Geochemical characteristics and exploration potential of Jurassic coal-formed gas in northwest China

Li Jian1,2,Hao Ai-sheng1,2,Qi Xue-ning1,2,Chen Xuan3,Guo Jian-ying1,2,Ran Qi-gui1,2,Li Zhi-sheng1,2,Xie Zeng-ye1,2,Zeng  Xu1,2, Li  Jin1,2, Wang Yu1,2,4, Liu Ru-hong1,2,4   

  1. 1.Institute of Natural Gas Geology，PetroChina Research Institute of Petroleum Exploration and Development，Langfang065007，China;2.Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007,China;
    3.Petroleum Exploration and Development Research Institute,PetroChina Tuha Oilfield Company,Hami 839009,China;
    4.University of Chinese Academy of Sciences，Beijing 100049,China

  • Received:2019-05-01 Revised:2019-05-28 Online:2019-06-10

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摘要： 中国西北地区侏罗系煤系地层广泛发育，主要分布于塔里木、准噶尔、柴达木和吐哈等盆地，煤成气资源非常丰富。中国西北地区侏罗系虽然具有相似的构造及沉积背景，但其形成的煤成气地球化学特征既有相似性，又有差别，因此，分析总结不同盆地侏罗系含油气系统的煤成气地球化学特征和勘探潜力，对寻找不同类型的煤成气藏具有重要的借鉴意义。通过综合对比分析认为中国西北地区侏罗系煤成气的干燥系数呈现“湿气单峰型”、“湿气—干气双峰型”和“干气单峰型”3种类型；δ13C1值分布范围大，对应烃源岩从低熟到过成熟完整的序列；出现的部分C2和C3的同位素倒转主要是混源作用和生物作用造成的；烃源岩成熟度是造成不同地区天然气地球化学差异的主要原因。西北地区侏罗系煤成气勘探潜力大，构造气藏的勘探程度相对较高，构造—岩性、岩性气藏是西北地区侏罗系煤成气未来的主要勘探类型；塔里木盆地库车坳陷的侏罗系、准噶尔盆地南缘的白垩系—侏罗系、吐哈盆地侏罗系高成熟煤成气和柴达木盆地侏罗系高—过成熟煤成气勘探潜力大，是未来西北侏罗系煤成气勘探的重要领域。

关键词: 中国西北地区, 侏罗系煤成气, 地球化学特征, 勘探潜力

Abstract: Jurassic coal-measure strata are widely developed in northwest China,mainly distributed in the Tarim Basin,Junggar Basin,Qaidam Basin and Turpan-Hami Basin.The Jurassic coal-formed gas resources are abundant in northwest China.Although the tectonic and sedimentary environments of Northwest China were similar,the characteristics of Jurassic coal-formed gas in northwest China vary greatly.Therefore,the analysis and summary of the geochemical characteristics of coal-formed gas in Jurassic petroleum systems in different basins is of great significance for searching for  searching for different types of coal-formed gases.The drying coefficient of Jurassic coal-formed gas in western China showed three types:“unimodal type of wet gas”,“unimodal type of dry gas” and “bimodal type of dry gas and wet gas”.Carbon isotope values of Jurassic coal-formed methane in northwest China have wide range indicating source rock with maturity of low to over mature stages.The carbon isotope of coal-formed gas in northwest China is generally a positive carbon isotope series,partly with δ13C2-δ13C3 inversion.δ13C2-δ13C3 inversion was mainly caused by mixture of gases generated from different maturity or organic matter and bacterial effects.Maturity is the main reason for the great difference of Jurassic coal-formed gas in northwest China,and mixture of gases is also another important factor.The exploration degree of structural gas reservoirs is relatively high.Structural-lithological and lithological gas reservoirs and deep strata are important exploration reservoir types in the Lower Jurassic System in northwest China.Jurassic in Kuqa Depression,Cretaceous to Jurassic in Junggar Basin,mature to high mature Jurassic coal-formed gas in Tuha Basin and high to over mature Jurassic coal-formed gas in Qaidam Basin are potential exploration fields in northwest China.

Key words: Northwest China, Jurassic coal-formed gas, Geochemical Characteristics, Exploration potential

中图分类号: 

  • TE122.1+13
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