天然气地球科学

• 天然气地质学 • 上一篇    下一篇

琼东南盆地深水区崖城组煤系烃源岩定量评价

熊波,苏龙,张功成,沈怀磊,郑建京   

  1. 1.中国科学院大学渗流流体力学研究所,河北 廊坊 065007;
    2.中国石油勘探开发研究院廊坊分院,河北 廊坊 065007;
    3.中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    4.中海石油(中国)有限公司北京研究中心,北京 100027
  • 收稿日期:2013-10-24 修回日期:2013-01-25 出版日期:2014-04-10 发布日期:2014-04-10
  • 通讯作者: 熊波xiongb69@petrochina.com.cn E-mail:xiongb69@petrochina.com.cn
  • 作者简介:熊波(1979-),男,湖北荆州人,博士研究生,主要从事油气田开发研究. E-mail:xiongb69@petrochina.com.cn.
  • 基金资助:

    中国科学院“西部之光”人才培养计划项目(编号:2008ZX05018-003);国家科技重大专项(编号:2011ZX05008-002-23;004-11);
    中国科学院油气资源研究重点实验室开放基金(编号:KFJJ2013-04)联合资助.

Quantitative Evaluation for Coal-bearing Source Rocks of Yacheng Formation in the Deepwater Area of the Qiongdongnan Basin

XIONG Bo,SU Long,ZHANG Gong-cheng,SHEN Huai-lei,ZHENG Jian-jing   

  1. 1.Institute of Porous Flow and Fluid Mechanics,University of Chinese Academy of Sciences,Langfang 065007,China;
    2.Langfang Branch of Research Institute of Petroleum Exploration and Development,Langfang 065007,China;
    3.The Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,
    Lanzhou 730000,China;4.CNOOC Research Center,Beijing 100027,China
  • Received:2013-10-24 Revised:2013-01-25 Online:2014-04-10 Published:2014-04-10

摘要:

油气勘探揭示,琼东南盆地深水区下渐新统崖城组属于海陆过渡相煤系烃源岩,是主力气源岩之一。选择崖城组煤系烃源岩样品开展全岩热解实验,定量评价生气极限和生烃动力学特征。结果表明,崖城组煤系烃源岩的主生气期镜质体反射率(RO)值为0.96%~2.74%,生气极限RO值为4.38%,该值对应处ΔRO的最大值为0.83%,且累积和阶段产率变化不大,预示煤系烃源岩生气过程基本结束。通过实验结果与收集到的钻井实测RO值对比,认为在中央坳陷边缘及其邻区,崖城组煤系烃源岩仍具有生成天然气的巨大潜力。该项研究对于深水区盆地的油气勘探具有重要的理论和现实意义。

关键词: 琼东南盆地, 煤系烃源岩, 生气极限, 生烃动力学

Abstract:

Oil and gas exploration of the Qiongdongnan Basin in South China Sea have revealed that source rocks in Lower Oligocene Yacheng Formation in the deepwater area,as one of the main gas source rocks,are coal-bearing source rocks of transitional facies.Based on the controlling factors for medium-sized gas fields in deepwater basin,we carried out the whole rock pyrolysis for coal-bearing source rocks of Yacheng Formation,and conducted study on quantitative evaluation for both the upper limit of maturity for gas generation (ULMGG) or “the deadline of gas generation” and quantitative dynamic model.Linked to geological background,we tested the thermal evolution of coal-bearing source rocks under different conditions and natural gas generation.The results show that the upper limit of maturity for gas generation of the whole rock is equal to 4.38% for vitrinite reflectance (VR),where the gas generation rates change little with the increase of maturation,the ΔRO-value is 0.83% of the maximum related to VR of 4.38%Ro,and the process of gas generation from source rock nearly ends while Ro is over 4.38%.At the same time,we obtained the quantitative dynamic model for coal-bearing source rocks of Yacheng Formation under different evolution stages.By comparing to both the conclusions of pyrolysis experiments and the data of VR from the source rock of Yacheng Formation on a series of selected 8 wells in the shallow-water continental shelf basins,it indicates that the most source rocks are still far from reaching ULMGG of the whole rock for type Ⅱ kerogen.The coal-bearing source rocks of Yacheng Formation in the local areas of the deepwater basin still have preferable natural gas generation potential,especially in the areas along the central depression belt from the depocenter to both the margin and its adjacent areas.It has both theoretical and practical significance to oil and gas exploration and development in the other basins with low exploration degree in the northern South China Sea.

Key words: Qiongdongnan Basin, Coal-bearing source rocks, The upper limit of maturity for gas generation, Kinetics

中图分类号: 

  • TE121.1+1

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