岩性油气藏 ›› 2021, Vol. 33 ›› Issue (2): 1–8.doi: 10.12108/yxyqc.20210201

• 油气地质 •    下一篇

内蒙古地区典型煤储层吸附特征

姚海鹏1,2,3,4,5, 于东方1,2,5, 李玲1,2,5, 林海涛1,2,5   

  1. 1. 内蒙古自治区煤田地质局, 呼和浩特 010000;
    2. 内蒙古自治区非常规天然气工程技术研究中心, 呼和浩特 010000;
    3. 中国矿业大学 煤层气资源与成藏过程教育部重点实验室, 江苏 徐州 221116;
    4. 中国矿业大学 资源与地球科学学院, 江苏 徐州 221116;
    5. 内蒙古煤勘非常规能源有限责任公司, 呼和浩特 010000
  • 收稿日期:2020-01-28 修回日期:2020-09-28 出版日期:2021-04-01 发布日期:2021-03-31
  • 通讯作者: 于东方(1988—),男,硕士,工程师,主要从事煤层气勘查开发技术研究工作。Email:1064220843@qq.com。 E-mail:1064220843@qq.com
  • 作者简介:姚海鹏(1982—),男,博士,教授级高级工程师,主要从事非常规天然气勘查开发方面的研究工作。地址:(010000)内蒙古呼和浩特市赛罕区腾飞南路32号煤勘大厦。Email:goldhowk@qq.com
  • 基金资助:
    国家重大专项“大型油气田及煤层气开发”子课题“内蒙古含煤区中低煤阶煤层气规模开发区块优选评价”（编号：2016ZX05041-003002）、内蒙古自治区科技创新引导奖励资金项目“内蒙古自治区牙克石-五九煤田煤系气资源评价体系研究”（编号：KCBJ-2018070）联合资助

Adsorption characteristics of typical coal reservoirs in Inner Mongolia

YAO Haipeng1,2,3,4,5, YU Dongfang1,2,5, LI Ling1,2,5, LIN Haitao1,2,5   

  1. 1. Coalfield Geological Bureau of Inner Mongolia Autonomous Region, Hohhot 010000, China;
    2. Research Center of Unconventional Natural Gas Engineering Technology in Inner Mongolia Autonomous Region, Hohhot 010000, China;
    3. Key Laboratory of Coalbed Methane Resources and Accumulation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    4. College of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    5. Inner Mongolia Coal Exploration Unconventional Energy Co., Ltd., Hohhot 010000, China
  • Received:2020-01-28 Revised:2020-09-28 Online:2021-04-01 Published:2021-03-31

PDF (PC)

191

摘要： 为研究内蒙古地区不同煤阶的典型煤储层吸附性特征，采集鄂尔多斯盆地北部地区、二连盆地白音华煤田、海拉尔盆地牙克石-五九煤田3个代表性地区的煤样，进行不同温度和压力条件下的平衡水法等温吸附测试。结果表明：①在各自储层温度条件下，牙克石-五九煤田长焰煤吸附能力最强，鄂尔多斯盆地北部高阶煤次之，白音华煤田褐煤吸附能力最小。② 3个煤样吸附性均随温度的升高而下降，且存在一个吸附性影响大的敏感温度，其敏感温度由高到低依次为鄂尔多斯盆地北部、牙克石五九煤田、白音华煤田。③煤化过程中羟基和羧基官能团数量的变化及应力压实作用是煤储层吸附能力差异的主要因素。④敏感温度的差异与煤变质程度、孔隙结构紧密相关。鄂尔多斯盆地北部，煤变质达到贫煤阶段，煤储层为连通性差、纳米级孔隙优势发育型储层，其吸附性敏感温度高；牙克石-五九煤田，煤变质达到长焰煤阶段，煤储层为连通性较好、纳米级优势发育型储层，其吸附性敏感温度中等；白音华煤田，煤未变质，处于褐煤阶段，煤储层为连通性好、纳米级—微米级孔隙均等发育型储层，其吸附性敏感温度低。该研究成果为探索煤储层改造提供了其他的可能性，不再局限于压裂改造的技术手段。

关键词: 煤储层, 吸附性, 等温吸附, 敏感温度, 鄂尔多斯盆地, 二连盆地, 海拉尔盆地

Abstract: In order to study the adsorption characteristics of typical coal reservoirs of different coal ranks in Inner Mongolia,coal samples from three representative areas including the northern areas in Ordos Basin,Baiyinhua coalfield in Erlian Basin group and Yakeshi-Wujiu coalfield in Hailar Basin group were conducted isothermal adsorption tests at different temperatures and pressures. The results show that:(1) Under the reservoir temperature, the adsorption capacity of long flame coal in Yakeshi-Wujiu coalfield is the strongest,followed by high-rank coal in northern Ordos Basin,and the adsorption capacity of lignite in Baiyinhua coalfield is the smallest.(2) The adsorbability of the three coal samples decreased with the increase of temperature,and it decreased rapidly within a certain temperature range called sensitive temperature. The sensitive temperature of coal reservoirs in northern Ordos Basin is the highest,followed by Yankeshi-Wujiu coalfield and Baiyinhua coalfield.(3) The variation of the number of hydroxyl and carboxyl functional groups and the stress compaction are the main factors affecting the adsorption capacity of coal reservoirs.(4) The difference of adsorptive sensitivity temperature of coal reservoir is closely related to coal metamorphism and pore structure. In northern Ordos Basin,the coal metamorphism reaches lean coal stage,and the coal reservoir is with poor connectivity and dominantly developed nano-sized pores,with high adsorption sensitivity temperature. In Yakeshi-Wujiu coalfield,the coal metamorphism reaches long flame coal stage,and the coal reservoir is with good connectivity and dominantly developed nano-sized pores,with medium adsorption sensitivity temperature. In Baiyinhua coalfield,the coal is not metamorphosed and is in lignite stage,and the coal reservoir is with good connectivity and well-developed nano-micron pores, with low adsorption sensitive temperature. The research results provide other possibilities for coal reservoir transformation, makes it no longer limited to fracturing technology.

Key words: coal reservoirs, adsorbability, isothermal adsorption, sensitive temperature, Ordos Basin, Erlian Basin, Hailar Basin

中图分类号: 

  • TE122
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