木里煤田西部聚煤期层序古地理特征与聚煤作用

发布时间：2018-08-26 19:13

【摘要】：为了深入认识木里煤田煤系沉积环境及聚煤规律,在已有研究成果的基础上通过野外踏勘及钻井等资料分析,对木里煤田西部地区聚煤期早中侏罗世含煤岩系进行了层序古地理特征及聚煤作用分析。结果表明:木里煤田西部地区中—下侏罗统可划分为4个3级层序;中侏罗世早中期(即层序2—层序3沉积期)是整个木里煤田西部的主要聚煤期,沉积相多以辫状河三角洲平原、三角洲前缘和浅湖相为主,物源主要来自于NE向;其中以中侏罗世早期的聚煤环境最好,形成了聚乎更聚煤中心;中侏罗世中期成煤环境相对变差,煤层厚度变薄层数增多,聚煤中心西移至雪霍立、哆嗦公玛。沉积相及古地理特征对聚煤作用具有显著的影响和控制,这一认识对木里煤田西部煤及煤系矿产勘查开发具有重要指导意义。
[Abstract]:In order to deeply understand the sedimentary environment and coal accumulation law of coal measures in Muli coalfield, the field exploration and drilling data are analyzed on the basis of existing research results. The sequence paleogeographic characteristics and coal accumulation process of the early and middle Jurassic coal-bearing rock series in the western part of Muli coal field were analyzed. The results show that the Middle and Lower Jurassic in the western part of Muli coalfield can be divided into 4 3-order sequences, and the early and middle Middle Jurassic (I. E. sequence 2-sequence 3 depositional period) is the main coal accumulation stage in the western part of Muli coalfield. The sedimentary facies are braided river delta plain, delta front and shallow lacustrine facies, and the provenance mainly comes from the NE direction, in which the coal accumulation environment in the early Middle Jurassic is the best, and the coal accumulation center is formed, and the main sedimentary facies are the braided river delta plain, the delta front and the shallow lacustrine facies. In the middle of Middle Jurassic, the coal-forming environment became worse, the thickness of coal seam increased, and the coal accumulation center moved westward to Xueholi, shivering Gongma. Sedimentary facies and paleogeographic features have significant influence and control on coal accumulation, which is of great significance to the exploration and development of coal and coal measures in the western part of Muli coalfield.
【作者单位】：西安科技大学地质与环境学院;青海煤炭地质局;
【基金】：国家自然科学基金面上项目(41472234) 中国煤炭地质总局科技发展专项(2011-1-03)~~
【分类号】：P618.11

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