准噶尔盆地南缘煤储层多尺度孔缝结构差异及影响因素

doi:10.3969/j.issn.1006-6535.2026.04.004

特种油气藏 ›› 2026, Vol. 33 ›› Issue (4): 23-31.DOI: 10.3969/j.issn.1006-6535.2026.04.004

准噶尔盆地南缘煤储层多尺度孔缝结构差异及影响因素

李文杰^1,2, 吴锦彪^1,2, 龙宇^1,2, 马能辉^1,2, 田瑞星^1,2, 廖正凯^1,2, 孔芳^1,2, 宿静怡^1,2

1.新疆亚新煤层气资源技术研究有限责任公司,新疆乌鲁木齐 830000;
2.新疆煤层气勘探开发重点实验室,新疆乌鲁木齐 830000

收稿日期:2025-07-02 修回日期:2026-05-25 出版日期:2026-08-25 发布日期:2026-10-15
作者简介:李文杰(1972—),男,高级工程师,1997年毕业于石油大学(华东)石油工程(采油)专业,现主要从事常规/非常规油气勘探开发工作。
基金资助:
新疆维吾尔自治区重大科技专项“准南深部煤层气地质-工程一体化技术应用及先导示范”(2023A01004-5);丝绸之路经济带创新驱动发展试验区与乌昌石国家自主创新示范区科技发展计划项目“新疆深层煤层气赋存机理与开发关键技术研究”(2023LQ01005);新疆维吾尔自治区重点研发项目“深部煤层气可采性评价与工程技术体系研究”(2024B01017-3)

Multi-scale differences in pore-fracture structures of coal reservoirs in the southern margin of the Junggar Basin and their influencing factors

Li Wenjie^1,2, Wu Jinbiao^1,2, Long Yu^1,2, Ma Nenghui^1,2, Tian Ruixing^1,2, Liao Zhengkai^1,2, Kong Fang^1,2, Su Jingyi^1,2

1. Xinjiang Yaxin Coalbed Methane Resources Technology Research Co.,Ltd.,Urumqi,Xinjiang 830000,China;
2. Key Laboratory of Xinjiang Coalbed Methane Exploration and Development,Urumqi,Xinjiang 830000,China

Received:2025-07-02 Revised:2026-05-25 Online:2026-08-25 Published:2026-10-15

摘要/Abstract

摘要： 准噶尔盆地南缘(简称准南)煤层气资源丰富,主要赋存于侏罗系八道湾组和西山窑组。为探明准南阜康矿区八道湾组和齐古断褶带西山窑组煤储层孔缝发育特征差异及其影响因素,通过CT扫描、扫描电镜、高压压汞、低温氮气吸附、二氧化碳吸附等实验,利用全孔径拼接技术开展研究。结果表明:研究区煤岩均发育烟煤,反射率相近,且均为中阶煤,阜康矿区(镜质组含量为81%～88%)煤质略优于齐古断褶带(镜质组含量为70%～78%),齐古地区煤化程度略高。阜康矿区煤储层裂缝发育少,孔隙类型以组织孔为主,局部发育少量气孔,理论吸附能力更强,平均兰氏体积为18.75 cm³/g,平均比表面积为74.13 m²/g,但受煤岩煤质影响,灰分的充填作用导致煤储层总孔容减少;齐古断褶带煤储层孔隙类型以气孔为主,介孔和大孔占比更高,平均兰氏体积为10.83 cm³/g,平均比表面积为68.05 m²/g。强烈的构造作用为裂缝的发育提供了条件,整体割理裂隙发育,呈现高孔渗、低损害的储层物性特征。综合分析认为,阜康矿区吸附性较好,含气量高,但裂缝发育程度不高,游离气难以富集,气体解吸难度大;齐古地区具有较大的开发潜力。该研究成果可为研究区煤层气的高效勘探开发提供理论依据。

关键词: 煤层气, 煤储层, 数字岩心, 孔缝结构, 全孔径表征, 准噶尔盆地南缘

Abstract: Coalbed methane resources are abundant in the southern margin of the Junggar Basin(hereafter referred to as the southern Junggar Area),and are mainly hosted in the Jurassic Badaowan Formation and Xishanyao Formation.To clarify the differences in pore-fracture development characteristics and their influencing factors for coal reservoirs in the Badaowan Formation of the Fukang mining area and in the Xishanyao Formation of the Qigu fault-fold belt in the southern Junggar area,CT scanning,scanning electron microscopy (SEM),high-pressure mercury intrusion,low-temperature nitrogen adsorption and carbon dioxide adsorption experiments were conducted,and a full-aperture stitching technique was applied for analysis.The results show that the coals in the study area are all bituminous coals with similar reflectance and medium coal rank.The coal quality of the Fukang mining area(vitrinite content of 81%-88%)is slightly better than that of the Qigu fault-fold belt(vitrinite content of 70%-78%),while the coalification degree in the Qigu area is slightly higher.In the Fukang mining area,the coal reservoirs have few developed fractures;pores are dominated by tissue pores,with a small number of gas pores locally developed.The theoretical adsorption capacity is stronger with an average Langmuir volume of 18.75 cm³/g and an average specific surface area of 74.13 m²/g;however,affected by coal quality,the infilling effect of ash reduces the total pore volume pores are dominated by gas pores with higher proportions of mesopores and macropores.In the Qigu fault-fold belt, the average Langmuir volume is 10.83 cm³/g and the average specific surface area is 68.05 m²/g.Intensive tectonism provides conditions for fracture development;cleats and fractures are well developed overall,resulting in the advantageous reservoir physical properties of high porosity and permeability and low damage.Comprehensive analysis indicates that the Fukang mining area has better adsorption and high gas content,but fractures are not well developed,free gas is difficult to accumulate,and gas desorption is difficult;the Qigu Area has longer-term and more stable development potential.These results provide a theoretical basis for efficient exploration and development of coalbed methane in the study area.

Key words: coalbed methane, coal reservoir, digital core, pore-fracture structure, full-aperture characterization, southern margin of the Junggar Basin

中图分类号:

李文杰, 吴锦彪, 龙宇, 马能辉, 田瑞星, 廖正凯, 孔芳, 宿静怡. 准噶尔盆地南缘煤储层多尺度孔缝结构差异及影响因素[J]. 特种油气藏, 2026, 33(4): 23-31.

Li Wenjie, Wu Jinbiao, Long Yu, Ma Nenghui, Tian Ruixing, Liao Zhengkai, Kong Fang, Su Jingyi. Multi-scale differences in pore-fracture structures of coal reservoirs in the southern margin of the Junggar Basin and their influencing factors[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 23-31.

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准噶尔盆地南缘煤储层多尺度孔缝结构差异及影响因素

Multi-scale differences in pore-fracture structures of coal reservoirs in the southern margin of the Junggar Basin and their influencing factors

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