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宁树正,张 莉,徐小涛,等. 新疆北部早、中侏罗世富油煤分布规律及控制因素[J]. 煤炭科学技术,2024,52(1):244−254

. DOI: 10.12438/cst.2023–0638
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宁树正,张 莉,徐小涛,等. 新疆北部早、中侏罗世富油煤分布规律及控制因素[J]. 煤炭科学技术,2024,52(1):244−254

. DOI: 10.12438/cst.2023–0638
NING Shuzheng,ZHANG Li,XU Xiaotao,et al. Distribution of early and middle Jurassic tar-rich coal and its geological controls in Northern Xinjiang[J]. Coal Science and Technology,2024,52(1):244−254. DOI: 10.12438/cst.2023–0638
Citation: NING Shuzheng,ZHANG Li,XU Xiaotao,et al. Distribution of early and middle Jurassic tar-rich coal and its geological controls in Northern Xinjiang[J]. Coal Science and Technology,2024,52(1):244−254. DOI: 10.12438/cst.2023–0638

新疆北部早、中侏罗世富油煤分布规律及控制因素

Distribution of early and middle Jurassic tar-rich coal and its geological controls in Northern Xinjiang

  • 摘要: 新疆北部富油煤资源丰富,约占全国富油煤资源的一半左右,富油煤资源的合理开发利用,是我国煤制油气用煤资源的重要补充。以往对本区煤炭资源的研究忽视了其油气资源属性,对其富油煤质特征和成因规律认识不清。在系统整理新疆北部6个赋煤带富油煤地质资料的基础上,补充采样测试数据137组,分析早、中侏罗世富油煤的煤岩煤质特征和分布规律,进一步探讨了富油煤形成的控制因素。通过对焦油产率的研究发现,新疆北部地区东北部、西部、中部部分地区焦油产率相对较高,东北部地区八道湾组高油煤呈不连续带状分布。按照煤的焦油产率由高到低依次为巴里坤–三塘湖赋煤带、准南赋煤带、伊犁赋煤带、准北赋煤带、吐哈赋煤带和准东赋煤带。新疆北部地区早、中侏罗世富油煤的形成主要受到成煤沉积环境、煤化程度和煤的显微组分等主要控制因素的影响。覆水还原环境为富油煤的富集提供了良好的条件,富油煤主要形成于相对覆水还原的泥炭沼泽环境,还原性越强,越利于富油煤生成和富集。煤的焦油产率随着镜惰比(V/I)的增加呈现升高的趋势,并且与挥发分和镜质组呈现正相关关系。镜质组最大反射率在生油高峰之前与焦油产率之间存在正相关性,随着煤化程度的升高,煤的焦油产率逐渐增加。煤的显微组分中含量相对较高的镜质组对焦油产率具有明显的正向促进作用,其中,富氢镜质组为富油煤的发育提供了良好物质基础。

     

    Abstract: The tar-rich coal resources in northern Xinjiang are rich, accounting for about half of the country's tar-rich coal. The rational development and utilization of tar-rich coal resources in this region is an important supplement to Chinese coal resources for coal-to-oil and gas. Previous studies on coal resources in this area have ignored their oil and gas resource attributes, and the characteristics and genetic laws of tar-rich coal are unclear. On the basis of systematically collecting the geological data of tar-rich coal in the six coal bearing belts of Northern Xinjiang, 137 groups of samples were collected and tested, the occurrence characteristics of early and middle Jurassic tar-rich coal was analyzed, and the geological controls of tar-rich coal were further discussed. The tar yield in the northeastern, western and central parts of northern Xinjiang was relatively high, while the high-oil coal was distributed in discontinuous bands in the Badaowan Formation in the northeast region. According to the tar yield of coal from high to low, the six coal bearing belts in northern Xinjiang are Balikun-Santanghu coal bearing zone, Zhunnan coal bearing zone, Yili coal bearing zone, zhunbei coal bearing zone, Turpan-Hami coal bearing zone and Zhundong coal bearing zone, respectively. The formation of tar-rich coal is affected by some factors, such as coal-forming environment, degree of coalification and coal macerals. The tar yield of coal is positively correlated with total sulfur content, volatile matter and vitrinite, and indicates an increasing trend with the increase of the ratio of vitrinite and inertinite (V/I). The reducing water environment provides good conditions for the enrichment of tar-rich coal. The tar-rich coal is mainly developed in the relatively reducing swamp environment. The stronger the reducibility of overlying water, the more conducive to the formation and enrichment of tar-rich coal. There is a positive correlation between maximum vitrinite reflectance and tar yield before the peak of oil generation. The tar yield of coal increases gradually with the increase of coalification degree. The relatively high vitrinite in coal macerals has a significant positive role in promoting tar yield, among these, hydrogen rich vitrinite provides a good material basis for the development of tar-rich coal.

     

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