天然气地球科学

• 非常规天然气 • 上一篇    下一篇

川中地区须家河组水溶气形成及脱气成藏有利地质条件分析

秦胜飞,李金珊,李伟,周国晓,李永新   

  1. 1.中国石油勘探开发研究院,北京 100083;
    2.北京科技大学土木与资源工程学院,北京 100083
  • 收稿日期:2017-05-17 修回日期:2018-05-31 出版日期:2018-08-10 发布日期:2018-08-10
  • 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);中国石油天然气股份有限公司科技项目(编号:2014B-0608)联合资助.

Analysis on favorable geologic conditions for water-soluble gas formation and degassing in central Sichuan Basin

Qin Sheng-fei,Li Jin-shan,Li Wei,Zhou Guo-xiao,Li Yong-xin   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    (2.Civil and Resource Engineering School,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2017-05-17 Revised:2018-05-31 Online:2018-08-10 Published:2018-08-10

摘要:

针对川中地区须家河组煤系烃源岩生气强度比较低但仍形成了一系列大气田(藏)的事实,针对其成藏研究存在的问题,采用地球化学分析手段对川中地区须家河组天然气、地层水进行了详细的研究。结合地质背景,对川中地区须家河组水溶气形成地质条件进行了详细剖析。研究表明,川中地区须家河组地层水比较发育,多层煤系烃源岩与多套砂岩相互叠置,具备很好的水溶气形成条件。气藏中地层水为CaCl2型,矿化度高,H、O同位素值远离大气降水线,天然气在独立的成藏系统中近距离成藏,说明地层水保存条件较好。喜马拉雅期的构造运动使川中地区大幅度抬升,上覆地层遭受剥蚀,地层水中溶解的天然气发生减压脱溶作用,释放出天然气可为已有的气藏补充额外的天然气,或在储集层高部位形成游离气藏。经过计算,须家河组整体抬升后,每立方米地层水大概可以释放出2.4m的甲烷。

关键词: 川中地区, 须家河组, 煤系, 水溶气, 形成条件, 成藏

Abstract:

In this paper,though according to the fact that the gas generation intensity of the Xujiahe coal measure source rocks in the middle of Sichuan Basin is relatively low,still a series of large gas fields (reservoirs) have been proved.Aiming at the problems existing in the study of reservoir formation,the geochemical analysis is used on the natural gas and formation water for a detailed study.Based on the geological background,the geological conditions for the formation of water-soluble gas in the Xujiahe Formation in central Sichuan Basin were analyzed in detail.The study shows that the Xujiahe Formation water in the middle Sichuan Basin is much developed,and the multi-layered coal-bed source rocks and multiple sets of sandstones are superimposed on each other.The Xujiahe Formation has good conditions for the forming of water-soluble gas.The formation water in Xujiahe Formation is CaCl2 type,with high salinity.The H and O isotope value are far away from the atmospheric precipitation line,indicating that the formation water has been well preserved.The dissolved natural gas in water can be well preserved together with the formation water.The tectonic movement of the Himalayan period has caused a significant uplift in the central Sichuan area,and the big erosion of the overlying strata.The decompression of the formation water caused the gas releasing from water.The released gas can either add additional natural gas to the existing gas reservoir,or form a free gas pool itself at higher site in the reservoir.After calculation,one cubic meter of formation water can probably release 2.4m3 of methane during Xujiahe Formation uplift.

 

Key words: Central Sichuan, Xujiahe Formation, Coal measures, Water-soluble gas, Forming condition, Gas accumulation

中图分类号: 

  • TE132.2

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