天然气地球科学

• 天然气地质学 • 上一篇    下一篇

四川盆地龙岗气田长兴组和飞仙关组气藏天然气来源

秦胜飞,杨雨,吕芳,周慧,李永新   

  1. 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油西南油气田分公司,四川 成都 610051
  • 收稿日期:2015-03-04 修回日期:2015-04-27 出版日期:2016-01-10 发布日期:2016-01-10
  • 作者简介:秦胜飞(1969-),男,安徽五河人,高级工程师,博士,主要从事天然气地质与地球化学和油气成藏研究. E-mail:qsf@petrochina.com.cn.
  • 基金资助:

    国家自然科学基金项目(编号:41372150);中国石油勘探开发研究院科技创新项目(编号:2012Y-001);中国石油天然气股份有限公司科技项目(编号:2014B-0608);重大专项(编号:2014E-3201)联合资助.

The gas origin in Changxing-Feixianguan gas pools of Longgang Gasfield in Sichuan Basin

Qin Sheng-fei,Yang Yu,Lv Fang,Zhou Hui,Li Yong-xin   

  1. 1.PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2.PetroChina Southwest Oil and Gas Company, Chengdu 610051, China
  • Received:2015-03-04 Revised:2015-04-27 Online:2016-01-10 Published:2016-01-10

摘要:

采用地球化学方法对龙岗气田长兴组和飞仙关组天然气来源进行了详细研究,天然气干燥系数很高,乙烷等重烃含量极低,非烃气体中除了少量的N2和CO2以外,普遍含有H2S气体。气田范围内长兴组和飞仙关组本身不具生烃能力。天然气地球化学特征与来自志留系和寒武系烃源岩天然气差异很大,也不可能来自志留系和寒武系烃源岩。气藏中普遍含有储层沥青,被认为是原油裂解的产物。因储层沥青与甲烷碳同位素之间没有明显分馏关系,甲烷并非直接来自原油裂解气。气藏中甲烷和乙烷碳同位素组成都很重,为高—过成熟的煤型气,天然气主要来自龙潭组煤系。与川西坳陷高—过成熟须家河组煤系烃源岩生成的天然气相比,龙岗气田甲烷碳同位素组成异常偏重,是由于烃源岩高演化程度和水溶气脱气混入这2个因素叠加而成,并不是目前多数研究者认为的是由TSR作用造成,因为甲烷碳同位素值和H2S含量没有明显的相关性。

关键词: 四川盆地, 龙岗气田, 长兴组, 飞仙关组, 天然气, 气源

Abstract:

The origin of natural gas in Changxing-Feixianguan Formations of Longgang Gasfield was studied in detail using geochemical methods in this paper.The gas has a very high dryness coefficient,very low ethane and other heavy hydrocarbons.Apart from a small amount of N2 and CO2,the non-hydrocarbon gases,it generally contains H2SWithin the field location,Changxing-Feixianguan Formations themselves do not have hydrocarbon-generation potential.Near the edge of the Kaijiang-Liangping Trough,there developed Dalong Formation,but it also has very low TOC content in the area of Longgang Gasfield,cannot act as effective source rock.The geochemistry of natural gas is much different from the gases generated by Silurian and Cambrian source rocks.So it is impossible that the gas in Longgang Gasfield is from Silurian and Cambrian source rocks.Gas reservoirs generally contain bitumen,which is considered a product of crude oil cracking.That the carbon isotope fractionation between the bitumen and methane is not distinct indicates that the gas is not directly from oil cracking.The carbon of methane and ethane has isotopically heavy value,which is considered from high-over mature coal-formed gas,mainly from Longtan Formation coal measures.Compared with the gas from high-over mature Xujiahe coal measure source rock in western Sichuan Depression,the methane in Longgang Gasfield has abnormal heavier carbon isotopic value.It is due to the superposition of these two factors together:Higher evolution of source rocks and mixing of gas degassing from water.It is not caused by TSR that most researchers believed at present because the methane carbon isotopic values have no relationship with H2S content.

Key words: Sichuan Basin, Longgang Gasfield, Changxing-Feixianguan Formations, Natural gas, Gas origin

中图分类号: 

  • TE122.1

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