宁东煤田红墩子矿区沉积环境对煤岩煤质的影响
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摘要
为了揭示沉积环境对煤岩煤质的影响,以宁东煤田红墩子矿区为研究区,采用沉积学和煤岩学等方法对太原组和山西组层序进行了划分,结合煤岩煤质数据,探讨了沉积环境对煤岩煤质的影响。研究结果表明:层序Ⅰ、层序Ⅱ煤层受海水潮汐作用影响,整体上硫分含量较层序Ⅲ高,镜质组和惰质组含量较低,平面上,灰分、硫分呈现出南高北低的规律,镜惰比则出现南低北高的现象;层序Ⅲ煤层受河流及物源的共同影响,高灰煤、高硫煤主要集中在矿区的南北两端,镜惰比则由于河流作用导致沼泽水动力强弱及覆水稳定的变化,出现南高北低的现象。
To reveal impacting on coal petrographic constituent and coal quality from sedimentary environment,taking the Hongdunzi mine area in the Ningdong coalfield as the subject investigated,through sedimentological and coal petrographic methods carried out sequence partitioning for the Taiyuan and Shanxi formations. Combined with coal petrographic and coal quality data,discussed impacting from sedimentary environment on coal petrographic constituent and coal quality. The result has shown that the coal seams in the sequencesⅠand Ⅱ have impacted from tidal actions,the sulfur contents are generally higher than in the sequence Ⅲ,vitrinite and inertinite contents lower. On the plane,ash and sulfur contents present a pattern of higher in the south and lower in the north,while the vitrinite/inertinite ratio( V/I ratio) on the contrary. Owing to joint impacts from fluviation and provenance,the high ash and high sulfur coals are concentrated on both south and north ends; owing to fluviation,the bog hydrodynamic intensity and overlying water stability have presented a pattern of V/I ratio higher in south and lower in north.
To reveal impacting on coal petrographic constituent and coal quality from sedimentary environment,taking the Hongdunzi mine area in the Ningdong coalfield as the subject investigated,through sedimentological and coal petrographic methods carried out sequence partitioning for the Taiyuan and Shanxi formations. Combined with coal petrographic and coal quality data,discussed impacting from sedimentary environment on coal petrographic constituent and coal quality. The result has shown that the coal seams in the sequencesⅠand Ⅱ have impacted from tidal actions,the sulfur contents are generally higher than in the sequence Ⅲ,vitrinite and inertinite contents lower. On the plane,ash and sulfur contents present a pattern of higher in the south and lower in the north,while the vitrinite/inertinite ratio( V/I ratio) on the contrary. Owing to joint impacts from fluviation and provenance,the high ash and high sulfur coals are concentrated on both south and north ends; owing to fluviation,the bog hydrodynamic intensity and overlying water stability have presented a pattern of V/I ratio higher in south and lower in north.
引文
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[2]邵龙义,董大啸,李明培,等.华北石炭—二叠纪层序-古地理及聚煤规律[J].煤炭学报,2014,39(8):1725-1734.
[3]陈全红,李文厚,郭艳琴,等.鄂尔多斯盆地早二叠世聚煤环境与成煤模式分析[J].沉积学报,2009,27(1):70-76.
[4]王双明.鄂尔多斯盆地构造演化和构造控煤作用[J].地质通报,2011,30(4):544-552.
[5]曹代勇,徐浩,刘亢,等.鄂尔多斯盆地西缘煤田构造演化及其控制因素[J].地质科学,2015,50(2):410-427.
[6]张鹏.宁夏红墩子矿区煤质特征及工业用途评价[J].中国煤炭地质,2010,22(11):1674-1803.
[7]晋香兰,张泓.鄂尔多斯盆地侏罗系成煤系统[J].煤炭学报,2014,39(S1):191-197.
[8]刘志飞,魏迎春,贾煦,等.马家滩矿区延安组层序-古地理对煤岩煤质的控制[J].煤田地质与勘探,2018,46(3):28-33.
[9]黄文辉,敖卫华,翁成敏,等.鄂尔多斯盆地侏罗纪煤的煤岩特征及成因分析[J].现代地质,2010,24(6):1186-1197.
[10]晋香兰,降文萍,李小彦,等.低煤阶煤的煤岩成分液化性能及实验研究[J].煤炭学报,2010,35(6):992-997.
[11]唐跃刚,贺鑫,程爱国,等.中国煤中硫含量分布特征及其沉积控制[J].煤炭学报,2015,40(9):1977-1988.
[12]汤达祯,杨起,周春光等.华北晚古生代成煤沼泽微环境与煤中硫的成因关系研究[J].中国科学(D辑:地球科学),2000,30(6):584-591.
[13]李小彦,武彩英,晋香兰.鄂尔多斯盆地侏罗纪成煤模式与煤质[J].中国煤炭地质,2005,17(5):18-21.
[14]秦勇,王文峰,李壮福等.海侵作用影响下的高分辨煤相序列及其古泥炭沼泽发育模式———以山西北部安太堡上石炭统太原组11号煤层为例[J].地质学报,2008,82(2):234-246.