黄道军, 许浩, 虎建玲,等.鄂尔多斯盆地中东部地区8号煤内生裂隙控制因素与发育规律[J].河南理工大学学报（自然科学版）,2026,45(1):10-17.

HUANG D J, XU H, HU J L, et al.Controlling factors and development patterns of cleats in No. 8 coal seam in the central-eastern Ordos Basin[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(1):10-17.

鄂尔多斯盆地中东部地区8号煤内生裂隙控制因素与发育规律

黄道军1, 许浩2,3, 虎建玲1, 吴小卓2,3, 焦鹏帅1, 陈世达2,3, 王彦卿1, 董煜2,3, 戴贤铎1, 武衡2,3

1.中国石油长庆油田分公司勘探开发研究院， 陕西 西安  710018；2.中国地质大学（北京） 能源学院， 北京  100083；3.煤层气开发利用国家工程研究中心， 北京  100083

摘要: 目的 内生裂隙是深部煤层中流体产出的主要通道，也是游离气重要的储集空间，其发育特征直接影响甲烷的赋存状态与渗流能力。 方法 以鄂尔多斯盆地中东部深部煤层为研究对象，基于钻井岩心精细描述和CT扫描成像技术，系统刻画了煤层内生裂隙特征。结合煤岩显微组分、矿物含量和镜质组反射率数据，综合探讨了内生裂隙的形成机制与主控因素。 结果 结果表明，内生裂隙发育程度受宏观煤岩类型、无机矿物含量和变质程度控制。由光亮煤转为暗淡煤过程中，内生裂隙密度逐渐降低，其中，光亮煤中内生裂隙最发育，平均达19.7条/5 cm，暗淡煤中基本不发育内生裂隙，内生裂隙只局限于镜质组内部，不切穿其他组分。随着矿物含量增加，内生裂隙发育程度逐渐降低。煤层镜质组反射率R_o为1.2%~1.8%时内生裂隙最发育，根据时间匹配分析，结合主要构造活动时期的应力场演化特点，推测研究区面割理走向呈NW-SE向。基于控制因素的空间展布规律圈定了研究区内生裂隙发育区域，研究区中部内生裂隙最为发育。 结论 本研究揭示了鄂尔多斯盆地中东部深部煤层内生裂隙的控制因素与空间分布规律，明确了煤岩类型、无机矿物含量及变质程度对裂隙发育的主控作用，为深部资源的勘探开发提供了科学依据。

关键词:内生裂隙;宏观煤岩类型;矿物含量;煤变质程度;深部煤层

doi:10.16186/j.cnki.1673-9787.2025060006

基金项目:国家自然科学基金资助项目（42172188）；中国石油天然气股份有限公司攻关性应用性科技专项（2023ZZ18）；中国石油长庆油田公司重大科技专项（2023DZZ01）

收稿日期:2025/06/03

修回日期:2025/08/18

出版日期:2025-12-03

Controlling factors and development patterns of cleats in No. 8 coal seam in the central-eastern Ordos Basin

Huang Daojun1, Xu Hao2,3, Hu Jianling1, Wu Xiaozhuo2,3, Jiao Pengshuai1, Chen Shida2,3, Wang Yanqing1, Dong Yu2,3, Dai Xianduo1, Wu Heng2,3

1.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company， Xi’an  710018， Shaanxi， China；2.School of Energy Resource， China University of Geosciences （Beijing）， Beijing  100083， China；3.National Engineering Research Center of CBM Development and Utilization， China University of Geosciences， Beijing  100083， China

Abstract: Objectives Cleats serve as the primary conduits for fluid production and the key storage spaces for free gas in deep coal seams. Their characteristics directly influence methane occurrence state and flow capacity. Methods Through detailed drill core descriptions and CT scanning， cleats in the deep coal seams of the central-eastern Ordos Basin were systematically characterized. By integrating analyses of coal macrolithotypes， mineral content， and vitrinite reflectance （R_o）， formation mechanisms and main controlling factors of cleats were comprehensively investigated. Results The results indicate that cleat development is controlled by macrolithotypes， mineral content， and coal metamorphism degree. Cleat frequency decreases progressively from bright to dull coal，with cleats most developed in bright coal （averaging 19.7 cleats per 5 cm） and largely absent in dull coal. Cleats are confined to vitrinite and do not penetrate other components. An increase in mineral content gradually reduces cleat development. Cleats are most developed when the vitrinite reflectance （R_o） ranges between 1.2% and 1.8%. Based on temporal matching analysis and the stress field evolution during major tectonic events， it is inferred that the face cleats in the study area trend NW-SE. Spatial distribution of these controlling factors was used to delineate cleat development zones， showing most intensive development in the central study area. Conclusions This study clarifies controlling factors and spatial distribution patterns of cleats in deep coal seams， confirming the dominant influence of coal macrolithotypes，mineral content， and metamorphism degree on cleat development. The findings provide a scientific basis for deep resource exploration and development.

Key words:cleats;macrolithotypes;mineral content;coal metamorphism degree;deep coal seam