天然气地球科学

• 天然气地质学 •    下一篇

塔里木盆地英吉苏凹陷煤成气前景良好

戴金星,洪峰,倪云燕,廖凤蓉   

  1. 中国石油勘探开发研究院,北京 100083
  • 收稿日期:2019-05-01 修回日期:2019-05-30 出版日期:2019-06-10
  • 作者简介:戴金星(1935-),男,浙江瑞安人,中国科学院院士,教授级高级工程师,主要从事天然气地质学和地球化学研究.E-mail:djx@petrochina.com.cn.
  • 基金资助:
    中国石油天然气股份有限公司科技项目(编号:2013B-0601)资助.

Good prospect of coal-derived gas in Yingjisu Sag,Tarim Basin

Dai Jin-xing,Hong Feng,Ni Yun-yan,Liao Feng-rong   

  1. Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:2019-05-01 Revised:2019-05-30 Online:2019-06-10

摘要: 塔里木盆地英吉苏凹陷华英参1井发现了有碳同位素证据的煤成气,为该凹陷天然气勘探带来新的曙光。以往认为烃源岩成熟度主体为0.50%~0.65%,在RO>0.7%才能形成工业性油气藏观点的影响下,预测煤成气可采资源量仅有245×108m3,因而近15年来在英吉苏凹陷未进行过以煤成气为目标的钻探。英吉苏凹陷和库车坳陷侏罗系煤系泥岩、炭质泥岩和煤的TOC值相近且属中等烃源岩,故成气成藏潜力良好。在该凹陷侏罗系残余厚度为1 000~2 000m的分布区,煤岩最大厚度分布区、炭质泥岩最大厚度分布区和暗色泥岩最大厚度分布区基本重合且连续展布面积约为8 000km2,应是煤成气资源最富集区和勘探有利区,估计今后勘探将可能发现气田。

关键词: 英吉苏凹陷, 煤成气, 侏罗纪煤系, 塔里木盆地

Abstract: Coal-derived gas determined by stable carbon isotopes were found in Well HYC 1 in the Yingjisu Sag,which brings new dawn for gas exploration in this sag.Thermal maturity of the source rocks is 0.50%-0.65%.According to the traditional views that industrial oil/gas accumulations can only be formed with thermal maturity of the source rocks over 0.70%,so the recoverable resources of coal-derived gas were only 245×108m3,and there was no drilling in the last 15 years.The TOC values of the Jurassic coal-measure mudstone,carbonaceous mudstone and coal in the Yingjisu Sag are similar to those in the Kuqa Depression,and both of them belong to medium-quality source rocks,so the potential of gas generation and accumulation is good.In the Yingjisu Sag,the Jurassic residual thickness is 1 000-2 000m.The distribution area with maximum thickness of coal is basically overlapped with the distribution areas with maximum thickness of carbonaceous mudstone and dark mudstone.The continuous distribution area is about 8 000km2,which should be the richest area and the most favorable exploration area for coal-derived gas resource,and gas fields will be discovered in the future.

Key words: Yingjisu Sag, Coal-derived gas, Jurassic coal measure, Tarim Basin

中图分类号: 

  • TE132.1+1
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