鄂尔多斯盆地大宁—吉县区块深层8 号煤夹矸特征及其与产能关系分析

doi:10.3969/j.issn.1672-7703.2025.04.008

摘要/Abstract

摘要： 鄂尔多斯盆地东部大宁—吉县区块深层8号煤具有良好的勘探潜力，但煤层夹矸发育，其分布特征及对产能的影响机制尚不清楚。通过对本区8口井的全直径螺旋CT 扫描，并结合煤岩的工业分析、孔隙结构、矿物成分等测试资料，对8号煤层夹矸进行高精度识别和表征，进而对夹矸发育特征及其与含气量、储层敏感性和产能的关系进行了综合评价。结果表明：大宁—吉县区块8号煤夹矸广泛发育，单井夹矸厚度占比约25.16%，发育密度约2.3 层/m，单层厚度为0.02～1.57m，一般厚度小于1m，夹矸累计厚度为0.20～2.66m ；夹矸含碳量低、微孔占比少、吸附性差，导致其生气能力及吸附能力均弱于煤层；夹矸中黏土矿物含量平均为61.61%，且以伊/ 蒙混层、高岭石及伊利石为主，容易发生水敏及速敏，对压裂后渗流通道的稳定性与有效性产生不利影响；夹矸含量、平均厚度、单层最大厚度与日产气量呈较好的负相关关系，分析认为夹矸的发育不仅降低了煤层总体的有机质含量，同时增强了煤层非均质性和敏感性，并影响了单井产能。研究成果可以为大宁—吉县区块深层煤层气压裂方案设计及合理排采措施制定提供科学依据。

关键词: 大宁—吉县区块, 深层, 8号煤, 螺旋CT 扫描, 夹矸, 分布特征, 含气性, 产能

Abstract: The deep No.8 coal seam in Daning–Jixian block in the eastern Ordos Basin demonstrates promising exploration potential. However, there is unclear understanding of the distribution characteristics and influence mechanisms on production capacity of the well-developed coal gangues. The high-precision identification and characterization of gangues in No.8 coal seam have been conducted by full-diameter spiral CT scanning for core section from eight wells in the study area, as well as coal rock laboratory data such as proximate analysis, pore structure, and mineral composition. Furthermore, a comprehensive evaluation has been performed on the development characteristics of gangues and their relationship with gas content, reservoir sensitivity, and production capacity. The results indicate that gangues in No.8 coal seam are extensively distributed in Daning–Jixian block, with a thickness proportion of approximately 25.16% in individual wells, a density of about 2.3 layers/m, a single-layer thickness of 0.02–1.57 m (generally <1 m), and the cumulative thickness of 0.20–2.66 m. The gangues are featured by low carbon content, low proportion of micropores, and poor adsorption performance, resulting in weaker gas generation and adsorption capacity compared to coal seams. The average clay mineral content in gangues is 61.61%, dominated by illite/montmorillonite mixed-layer minerals, kaolinite,and illite, which are prone to water and velocity sensitivity, adversely affecting the stability and effectiveness of post-fracturing flow pathways.It shows distinctly negative correlation between gangue content, average thickness, maximum single-layer thickness, and daily gas production.The study concludes that the gangues not only reduce the overall organic content of coal seams but also enhance reservoir heterogeneity and sensitivity, ultimately reducing well production capacity. These findings provide a scientific basis for optimizing hydraulic fracturing design and rational drainage strategy of deep coalbed methane in Daning–Jixian block.

Key words: Daning–Jixian block, deep formation, No.8 coal seam, spiral CT scanning, gangue, distribution characteristics, gas content, production capacity

中图分类号:

TE122.2

黄红星, 石军太, 陈国辉, 王峰, 陶自强, 刘莹, 朱文涛, 李小刚, 赵浩阳, 常益行, 林海鲲, 何睿. 鄂尔多斯盆地大宁—吉县区块深层8 号煤夹矸特征及其与产能关系分析[J]. 中国石油勘探, 2025, 30(4): 106-117.

Huang Hongxing, Shi Juntai, Chen Guohui, Wang Feng, Tao Ziqiang, Liu Ying, Zhu Wentao, Li Xiaogang, Zhao Haoyang, Chang Yihang, Lin Haikun, He Rui. Characteristics of gangues in deep No.8 coal seam and their relationship with production capacity in Daning–Jixian block, Ordos Basin[J]. China Petroleum Exploration, 2025, 30(4): 106-117.

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