基于太赫兹光谱的煤岩发育程度分析研究  

Analysis of Coal and Rock Development Degree Based on Terahertz Spectrum

作　　者：张文雅 张明扬 孙红华 程兴春 王灿丹婷 吴颖 宋超 Zhang Wenya;Zhang Mingyang;Sun Honghua;Cheng Xingchun;Wang Candanting;Wu Ying;Song Chao(No.2 Mud Logging Company,BHDC,CNPC,Hebei,062522;China University of Petroleum(Beijing),State Key Laboratory of Petroleum Resources and Engineering,Beijing,102249)

机构地区：[1]中国石油渤海钻探第二录井分公司,河北062522 [2]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249

出　　处：《当代化工研究》2024年第21期39-41,共3页Modern Chemical Research

摘　　要：煤岩发育程度的快速无损分析对指导煤层气勘探开发地质工程甜点具有重要意义。利用太赫兹时域光谱和热重分析技术,分析了源于煤层气开发现场的不同发育程度煤岩,获得了煤岩的太赫兹时域光谱、热重曲线和微观形貌特征。结果表明,随着煤岩的最快热解速率温度增加,太赫兹时域光谱时间延迟增大。高变质程度煤的脂肪族化合物、烷基侧链、甲氧基和羧基等含氧官能团较少,芳香族化合物的缩合度和芳环数大,热解较难,太赫兹折射率大。因此,太赫兹时域光谱可作为评价煤系储层的重要技术补充,为煤层气勘探开发提供新理论新方法。The rapid and non-destructive analysis of coal and rock development is crucial for guiding coalbed methane(CBM)exploration and identifying geological engineering sweet spots.Terahertz time-domain spectroscopy(THz-TDS),thermogravimetric analysis(TGA),and scan-ning electron microscopy(SEM)were employed to analyze coal rocks with different development stages.The results indicate that the time delay in THz spectra increases with the rise of temperature corresponding to the fastest pyrolysis rate.High-rank coals exhibit fewer oxygen-containing func-tional groups such as aliphatic compounds,alkyl side chains,methoxyl groups,and carboxyl groups.They also show a high degree of condensation and a large number of aromatic rings in aromatic compounds,making them difficult to pyrolyze and resulting in a high THz refractive index.There-fore,THz-TDS can be a significant technical supplement for evaluating coal reservoirs,offering new theoretical and methodological insights for CBM's exploration and development.

关 键 词：太赫兹 煤系储层 发育程度 时间延迟 

分 类 号：TD82[矿业工程—煤矿开采]