天然气地球科学

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地东部地区侏罗系烃源岩及其低熟气形成条件

张明峰,熊德明,吴陈君,马万云,孙丽娜,妥进才   

  1. (1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.中国科学院大学,北京 100049;3.新疆油田公司实验检测研究院,新疆 克拉玛依 834000)
  • 收稿日期:2015-06-12 修回日期:2015-07-24 出版日期:2016-02-10 发布日期:2016-02-10
  • 作者简介:张明峰(1979),男,甘肃兰州人,副研究员,博士,主要从事油气地质和地球化学研究. E-mail:zhangmingfeng_9@hotmail.com.
  • 基金资助:

    中国科学院西部行动计划项目(编号:KZCX2XB312);中国科学院先导科技专项(编号:XDB01030403);甘肃省重点实验室专项(编号:1309RTSA041)联合资助.

Source rock condition and the formation of Jurassic lowmaturitygases in the eastern Junggar Basin

Zhang Mingfeng,Xiong Deming,Wu Chenjun,Ma Wanyun,Sun Lina,Tuo Jincai   

  1. (1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;3.Research Institute of Experiment
    and Detection,Xijiang Oilfield Company,Karamay 834000,China)
  • Received:2015-06-12 Revised:2015-07-24 Online:2016-02-10 Published:2016-02-10

摘要:

源岩条件是低熟气形成的重要因素,准噶尔盆地东部地区侏罗系烃源岩分布范围广,厚度大,有机质为腐殖型烃源岩,RO值绝大多数都小于1.0%,具备有利于低熟气形成的源岩基础。通过地球化学分析,发现侏罗系烃源岩埋深为2 200~4 500m, RO值变化幅度很小,基本都在0.5%~0.8%之间。同一口井和不同区域的侏罗系烃源岩,都表现出随着埋深增加RO值变化范围较小,还未达到常规意义上的生气高峰阶段,并且在此演化阶段保持了很长的地质历史时间。针对实际地质情况,开展温度和时间条件下低熟气形成的热解生烃模拟实验研究,实验结果表明,330℃和350℃时,烷烃气产量较低,随着时间增加(3~30d)产气量变化很小,加热温度370℃和390℃,随着时间增长,气体增加量在14~21d达到最高峰,之后到30d呈缓慢增加或基本保持不变,相对同一温度3d时产气量增加2~2.5倍,即RO值增高0.2%~0.3%时,烷烃气生成量有显著增加,说明时间效应对低熟气形成有重要作用,并且受温度条件的限制。

关键词: 准噶尔盆地东部, 侏罗系烃源岩, 热解模拟实验, 时间和温度效应, 低熟气形成

Abstract:

Source rock condition is an important factor in the formation of lowmature gas.The Jurassic source rocks are widely distributed with large thickness in the eastern Junggar Basin.The organic matter type is Ⅲ,and its maturity is less than 1.0%.Geochemical analysis showed that RO(%) changes slightly,basically between 0.5% and 0.8% from 2 200m to 4 500m.The RO(%) variation is small with the increase of the depth of source rocks,indicating that it has not reached the gas generation peak,and this evolutionary stage holds a long geological history of time.To obtain information about the influences of heating time and temperature during the evolution of sedimentary organic matter,with hydrous pyrolysis,twenty experiments were conducted at different temperatures and heating time.The results showed that alkane gas production is low and change little with increasing pyrolysis time (330days) at 330℃ and 350℃.With the increase of  simulation temperature (370℃ and 390℃),the alkane gas production reaches the peak at 1421 days,and after that to the day 30 it showed a slow increase or nearly unchanged,relative to the same temperature for 3 days,the gas production increased 23 times,i.e.,RO increased by 0.2%0.3%.The amount of hydrocarbons gas increased significantly.That means,the effect of time on the evolution of lowmature gas may be related to the maturity.

Key words: Eastern Junggar Basin, Source rock of Jurassic, Hydrous pyrolysis experiments, Pyrolysis time and temperature, Lowmaturity gases formation

中图分类号: 

  • TE122.1

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