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天然气勘探与开发 >

2023 , Vol. 46 >Issue 3: 131 - 139

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2023.03.016

非常规油气

吐哈盆地低煤阶煤岩孔隙结构精细表征及吸附性主控因素评价

  • 杨强 ,
  • 徐少立 ,
  • 周红飞 ,
  • 冯鹏 ,
  • 高义兵
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  • 1.中国石油西南油气田公司勘探开发研究院;
    2.中国地质大学（北京） 非常规天然气地质评价与开发工程北京市重点实验室;
    3.中国石油测井公司西南分公司
杨强,男,1995年生,汉族,硕士,助理工程师;主要从事非常规油气储层评价方面的研究工作。地址：（610041）四川省成都市高新区天府大道北段12号。Email：lychee@petrochina.com.cn

修回日期: 2023-06-25

  网络出版日期: 2023-09-21

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Fine characterization on pore structure and evaluating influential factors on absorptivity in low-rank coals, Turpan-Hami Basin

  • YANG Qiang ,
  • XU Shaoli ,
  • ZHOU Hongfei ,
  • FENG Peng ,
  • GAO Yibing
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  • 1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China;
    2. Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, China University of Geosciences (Beijing), Beijing 100083, China;
    3. Southwest Company, CNPC Logging Corporation, Chongqing 401147, China

Revised date: 2023-06-25

  Online published: 2023-09-21

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摘要

为研究吐哈盆地低煤阶煤岩孔隙结构及其吸附特性,探讨煤岩吸附性能主控因素,通过高压压汞、低温液氮、核磁共振及等温吸附实验,对该盆地主要含煤地区低煤阶煤的孔隙结构及其甲烷吸附性影响因素进行了精细表征与分析。结果表明：①低煤阶煤岩发育多种吸附—脱附曲线,孔隙类型主要以细颈瓶状的一端封闭型孔为主,连通性较差。②吸附孔比表面积主要由微孔贡献,而吸附孔孔容主要由小孔提供,比表面积等孔隙结构参数差异大。③核磁共振实验表明煤样发育多种孔裂隙系统,但主要以微、小孔为主,中大孔及裂隙相对发育。④煤岩吸附性能受煤岩煤质及吸附孔孔隙结构共同控制,灰分及水分不利于甲烷的吸附。⑤镜质组孔隙发育,与最大吸附气量呈正相关关系;不同尺度吸附孔隙的吸附性能差异明显,小孔孔容及比表面积与最大吸附气量呈正相关关系,是吐哈盆地低煤阶煤岩吸附性能的主要贡献者。

关键词： 吐哈盆地; 低煤阶煤; 孔隙结构; 弛豫时间; 等温吸附; 吸附能力

本文引用格式

杨强 , 徐少立 , 周红飞 , 冯鹏 , 高义兵 . 吐哈盆地低煤阶煤岩孔隙结构精细表征及吸附性主控因素评价[J]. 天然气勘探与开发, 2023 , 46(3) : 131 -139 . DOI: 10.12055/gaskk.issn.1673-3177.2023.03.016

Abstract

In this study, fine characterization on pore structure and methane absorptivity was conducted and analyzed for low-rank coals in the main coal-bearing areas of Turpan-Hami Basin through some approaches, like high-pressure mercury intrusion, low-temperature liquid nitrogen adsorption, nuclear magnetic resonance (NMR) and isothermal adsorption experiments. Moreover, the major influential factors on this absorptivity were discussed. Results show that (i) there exhibit diversified adsorption-desorption isotherms in the low-rank coals whose pore structure is dominated by closed-end pores with narrow neck and poor connectivity; (ii) for absorptive pores, the specific surface is primarily stemmed from micropores, and their volume is mostly afforded by tiny pores. Such specific surface concerning pore structure reveals a great difference; (iii) NMR experiments indicate multiple sorts of pores and fissures well developed in coal samples with micropores and tiny pores as the soul, followed by medium to large pores and fissures; (iv) the absorptivity is jointly controlled by coal quality and absorptive pore structure. Ash and moisture content is unfavorable for methane adsorption; and (v) vitrinite in organic carbon supposes more developed pores, which is positively correlated with the maximum absorbability of natural gas. Absorptive pores with different size are significantly distinct in their absorptivity. For tiny pores, both pore volume and specific surface are positively correlated with the maximum absorbability. Thus, these tiny pores serve as leading contributors to the absorptivity of low-rank coals in Turpan-Hami Basin.

Key words： Turpan-Hami Basin; Low-rank coal; Pore structure; Relaxation time; Isothermal adsorption; Absorptivity

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