陕北中鸡南部2号煤组赋存特征及沉积解释  

Deposition features and sedimentary explanation of No. 2 seam group in south Zhongji of northern Shaanxi

作　　者：李明培 苗霖田[1,3] 王东东[4] 李静琴 

机构地区：[1]陕西煤田地质勘查研究院有限公司,陕西西安710026 [2]陕西能源集团研究院,陕西西安710061 [3]国土资源部煤炭资源勘查与综合利用重点实验室,陕西西安710026 [4]山东科技大学,山东青岛266590

出　　处：《煤炭科学技术》2016年第9期161-166,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41402086);陕西省地质勘查基金资助项目(61200901001);山东科技大学人才引进科研启动基金资助项目(2013RCJJ008)

摘　　要：为揭示中鸡南勘查区2号煤组的复合—分叉—复合的成因机理及聚煤规律,以沉积学的理论为指导,采用煤岩层对比和岩相古地理恢复的方法,对2号煤组的空间展布、聚煤规律进行研究。结果表明:研究区西部和东部2号煤组复合为2^(-2)煤,中部—中东部分叉为2层局部可采的2^(-2)和2^(-2)下煤层;2号煤组沉积期岩相古地理展布表明西部和东部煤层复合区主要位于三角洲平原相区,中部—中东部的分叉区主要位于三角洲前缘和滨湖相区,煤层厚度、复合—分叉—复合特征受控于煤层沉积时期可容空间增长速率与泥炭堆积速率之间的平衡性;通过聚煤规律和周边煤炭勘探开发现状分析,认为研究区西侧的2^(-2)煤层具有较大的资源潜力,是将来扩大勘查工作的潜在目标区。In order to reveal the composition- bifurcation- composition formation mechanism and coal accumulation law of No. 2 seam group in South Zhongji Survey Block,with the sedimentology theory as the guidance,the coal and rock comparison and the lithofacies and paleogeography restoration method were applied to the study on the spatial distribution and the coal accumulation law of No. 2 seam group.The results showed that No. 2 seam composition at the west part and east part of the study block was named as No. 2^-2seam and the bifurcation at the middle-middle east part of the study block would have two local mineable seams as No. 2^-2seam and No. 2^-2lowseam. The sedimentary period lithofacies and paleogeography distribution in No. 2 seam group showed that the composition block in the west part and east part of the seam was mainly located in the delta plain facies zone,the bifurcation at the middle and middle east part of the seam was mainly located at the delta leading edge and the shore lake facies and the thickness of the seam was thick. The composition-bifurcationcomposition features were controlled by the balance between the accommodation space growth rate and the peat accumulation rate in the seam sedimentary period. With the analysis on the coal accumulation law and the surrounding coal exploration and development status,the paper held that No. 2^-2seam at the west side of the study area would have a high resource potential and would be the potential target area of the late expanded survey work.

关 键 词：煤层对比 沉积环境 泥炭堆积速率 聚煤规律 延安组 

分 类 号：P618.11[天文地球—矿床学]