资源与产业 ›› 2018, Vol. 20 ›› Issue (4): 52-55.DOI: 10.13776/j.cnki.resourcesindustries.20180727.008

• “煤层气资源评价与开发”主题专辑 • 上一篇    下一篇

沁水煤田玉溪井田煤层气赋存特征及地面抽采潜力 

吴 静    

  1. (中煤科工集团西安研究院有限公司,陕西 西安 710054) 
  • 收稿日期:2018-02-04 修回日期:2018-05-26 出版日期:2018-08-20 发布日期:2018-10-10
  • 通讯作者: 吴静(E-mail: wujing@cctegxian.com)
  • 基金资助:
    国家油气重大专项(2016ZX05045-002) 

CBM OCCURRENCE FEATURES AND GROUND-PUMPING POTENTIALS OF YUXI WELL FIELD IN QINSHUI COALFIELD 

WU Jing    

  1. (Xi'an Research Institute Co. , Ltd. , China Coal Technology & Engineering Group, Xi'an 710054, China) 
  • Received:2018-02-04 Revised:2018-05-26 Online:2018-08-20 Published:2018-10-10
  • Supported by:
     

摘要: 沁水煤田是我国规模最大的煤层气资源开发利用区块,已进行了大量的煤层气勘探及开发工作,但是其中玉溪井田地面煤层气开发的相关研究较少。基于沁水煤田玉溪井田3号煤的储层地质特征,分析3号煤的含气性及煤层气赋存规律,研究其含气量与煤变质程度、煤厚、埋深、煤层顶底板、构造之间的关系,并采用数值模拟方法预测了地面压裂直井的产气量和采收率,评价了3号煤煤层气的地面抽采潜力。结果表明:玉溪井田构造简单,断层较少,煤层厚度较大,埋深适中,含气量较高,渗透性较好,吸附性强,储层地质条件较好;井田构造为一单斜,3号煤的顶底板岩性致密,有利于煤层气的富集储存;3号煤含气量随厚度、埋深和煤变质程度的增加而增大;预测垂直压裂井15年累计产气量为410.53×10^4 m^3,采收率达60%,且能将工作面含气量降至8 m^3/t以下,煤层气地面抽采潜力较大。研究成果可为玉溪井田的煤层气开发和瓦斯治理提供参考和借鉴。 

 

关键词: 煤层气;抽采潜力;产能预测;玉溪井田 

Abstract: Qinshui coalfield as China's largest developed block of CBM resource has been extensively explored and developed, but receives less research in its Yuxi well field. This paper, based on its No.3 coal seam geology, studies its gas and CBM occurrence, and relation among gas content and coal metamorphism, coal thickness, buried thickness, coal bed top and bottom and structure, and applies simulation to forecast ground fractured vertical well gas production and recovery, assesses the ground pumping potential of No.3 coal seam. Results show that the structures are simple with less faults, thick coal seam, medium buried depth, high gas content, good permeability, strong absorbability, and favorable reservoir geology. The well field is a monocline with compact top and bottom, good for gas enrichment. Gas content rises as thickness, buried depth and coal metamorphism increase. It is predicted that the vertical fractured well would have an accumulative gas production up to 410.53×10^4 m^3 in 15 years at a recovery at 60%, and the working face gas content may be lowered below 8 m^3/t. This research offers references for CBM development and gas controls in Yuxi well field.  

Key words: CBM, pumping potential, production forecast, Yuxi well field 

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