姚征, 罗乾周, 李宁, 李华兵, 王强, 高骏. 陕北石炭—二叠纪富油煤赋存特征及影响因素[J]. 煤田地质与勘探, 2021, 49(3): 50-61, 68. DOI: 10.3969/j.issn.1001-1986.2021.03.007
引用本文: 姚征, 罗乾周, 李宁, 李华兵, 王强, 高骏. 陕北石炭—二叠纪富油煤赋存特征及影响因素[J]. 煤田地质与勘探, 2021, 49(3): 50-61, 68. DOI: 10.3969/j.issn.1001-1986.2021.03.007
YAO Zheng, LUO Qianzhou, LI Ning, LI Huabing, WANG Qiang, GAO Jun. Occurrence characteristics of Carboniferous-Permian tar-rich coal and its influencing factors in Northern Shaanxi[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 50-61, 68. DOI: 10.3969/j.issn.1001-1986.2021.03.007
Citation: YAO Zheng, LUO Qianzhou, LI Ning, LI Huabing, WANG Qiang, GAO Jun. Occurrence characteristics of Carboniferous-Permian tar-rich coal and its influencing factors in Northern Shaanxi[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 50-61, 68. DOI: 10.3969/j.issn.1001-1986.2021.03.007

陕北石炭—二叠纪富油煤赋存特征及影响因素

Occurrence characteristics of Carboniferous-Permian tar-rich coal and its influencing factors in Northern Shaanxi

  • 摘要: 加强我国富油煤合理开发对推进煤炭清洁高效利用、提升油气自主保障能力和实现碳达峰、碳中和目标具有重要意义。为查明陕北石炭–二叠纪煤田典型矿区富油煤赋存特征,基于煤炭勘查资料和样品测试结果,对比了可采煤层焦油产率变化特征,分析富油煤时空分布规律,探讨富油煤赋存影响因素。结果表明:可采煤层焦油产率均值呈北高南低趋势,古城矿区为9.22%~11.6%,府谷矿区为8.49%~11.02%,吴堡矿区为5.15%~6.89%;古城–府谷矿区主要发育富油煤,古城矿区富油煤分布以环带状为主,府谷矿区含油煤呈分散状发育于富油煤之间,吴堡矿区以含油煤为主、富油煤少量分布、高油煤不发育;府谷矿区7煤属富油–高油煤,其高油煤分布面积占比高达23%,且3、4、8煤中富油–高油煤分布面积占比均超过94%;随煤化程度升高,富油煤发育频率降低,中低阶煤分布区最有利于富油煤的赋存;煤焦油产率与活性组分、氢含量、灰成分中钙、镁、硫氧化物含量及镜惰比(V/I)、H/C原子比、挥发分产率呈正相关,与惰质组、石英、黏土矿物含量和灰分产率呈负相关;沉积环境的闭塞、还原和碱性程度越高,越利于富油煤生成和赋存。煤化程度、成煤物质、沉积环境和无机沉积作用共同影响着富油煤赋存特征。古城–府谷矿区富油煤资源潜力巨大,建议加强富油煤保护性开采和高效化利用。

     

    Abstract: The rational development of tar-rich coal is of great significance to promote clean and efficient utilization of coal, improve the independent guarantee ability of oil and gas, and achieve carbon emission peak and carbon neutrality. In order to find out the occurrence characteristics of tar-rich coal in the typical mining areas of Carboniferous-Permian coalfield in Northern Shaanxi, based on coal exploration data and sample test results, this paper compares the tar yield of mineable coal seams, summarizes the spatial-temporal distribution rules of tar-rich coal, and discusses the occurrence influential factors. The results show that the average tar yield of mineable coal seams is higher in the north than that in the south, with 9.22%-11.6%, 8.49%-11.02% and 5.15%-6.89% in Gucheng, Fugu and Wubu Mining Areas respectively. Tar-rich coal mainly distributes in Gucheng-Fugu Mining Area, with tar-rich coal seams mainly of circle-belt pattern in Gucheng Mining Area, and tar-containing coal seams primarily scattered between tar-rich coal seams in Fugu mining area. Wubu mining area is dominated by tar-containing coal, with a small amount of tar-rich coal distributed and high-tar coal undeveloped. No.7 coal seam in Fugu Mining Area belongs to rich-high tar coal, with the distribution area of high-tar coal accounting for 23%, and the distribution area of tar-rich and high-tar coal of No.3, No.4 and No.8 coal seams all exceeding 94%. The developmental frequency of tar-rich coal decreases with the increase of coalification degree, and distribution regions of low and middle rank coal are greatly favourable areas for tar-rich coal occurrence. Coal tar yield positively correlates with the content of reactive component, hydrogen, oxide of calcium, magnesium and sulfur in ash composition, V/I, H/C atomic ratio and volatile matter, while negatively correlates with the content of inertinite, quartz, clay minerals and ash yield. The higher the degree of occlusion, reduction and alkalinity in depositional environment, the more favourable for tar-rich coal development. Coalification degree, coal-forming material, depositional environment and inorganic deposition act together on the tar-rich coal occurrence. As tar-rich coal has great potential in Gucheng-Fugu Mining Area, it is suggested to strengthen the protective mining and efficient utilization of the special coal resource.

     

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