1. Exploration and Development Research Institute of Huabei Oilfield Company,PetroChina,Renqiu　 062552,China;2. School of Energy Science and Engi-neering,Henan Polytechnic University,Jiaozuo　 454000,China;3. Collaborative Innovation Center of Coalbed Methane (Shale Gas) in Central Plains Econom-ic Zone,Jiaozuo　 454000,China;4. Exploration and Development Research Institute of Huabei Oilfield Company,PetroChina,Changzhi　 046000,China

以山东腾南煤田金源矿为研究区,采集不同煤体破坏程度的煤样,通过溶剂分级萃取实验,利用X射线衍射（XRD）和核磁共振（NMR）测试技术,对比分析了萃取前后煤样的微晶结构参数,探讨了化学结构特征参数的变化规律。研究表明:（1）在不同溶剂的分级萃取下,不同煤体结构煤的累计萃取率从小到大依次为原生结构煤、碎裂煤、碎粒煤、糜棱煤,其中THF溶剂对各类煤样的萃取率最大;（2）溶剂萃取后,各类煤样的碳原子网面间距(d002)、堆砌度（Lc）和延展度（La）均大于原煤。随着萃取级数的增加,各煤样的碳原子网面间距(d002)呈现较复杂的变化趋势,BSU的堆砌度（Lc）除了糜棱煤随着萃取的深入有略微减小外,总体上随着萃取级数的增加呈现增大的趋势;（3）随着构造变形的增强,构造煤的芳碳率呈增大的趋势,而脂碳率的数值变化有明显减小的趋势。溶剂的萃取作用中,脂族类的小分子化合物更容易溶出,芳香环上的小分子化合物萃取率较低。

Based on the coal samples with different coal body structures in Jinyuan mine,Shandong Province,the ex- periment of coal extraction has achieved by different solvent fractionated extractions. Also,the microcrystalline struc- ture parameters of coal samples were analyzed by means of X-ray diffraction (XRD) and the variation characteristics of chemical structure of tectonic coal and residues were studied with the nuclear magnetic resonance (NMR) technolo- gy. The research shows that under the fractional extraction by different solvents,the extraction rates of coal samples with different coal body structures ( from low to high) are as follows:raw coal,cataclastic coal,granulated coal,and mylonitic coal. Meanwhile the extraction rate by tetrahydrofuran (THF) is the largest. After the extraction,the parame- ters of d002 ,La and Lc of coal samples are larger. As the deformation degree of coal body structures increases,the aro- matic lamellae spacing (d002 ) in aromatic fused ring of coal shows a complicated trend,but the stack height (Lc ) appears an increasing trend except the Lc of mylonitic coal decreases slightly. And the aromatic-carbon ratio (fa ) also in- creases,but the aliphatic carbon ratio ( fal ) shows a decreasing trend. Furthermore,the research concludes that the small molecular compounds of aliphatic strip easily,the extraction rate of small molecular compounds of aromatic rings is low during the process of extraction.

国家自然科学基金资助项目(41372162)；河南省高校科技创新团队支持计划资助项目(14IRTSTHN002)；

Yang Yanhui,Zhang Xiaodong,Yang Yanlei,et al. Change characteristics of microcrystalline and chemical structure parameters of tectonic coals under solvents extraction[J]. Journal of China Coal Society,2016,41(10):2638-2644.