青海哆嗦公马矿区中侏罗统沉积环境及聚煤规律

发布时间：2018-02-26 18:14

本文关键词： 木里煤田中侏罗世沉积环境聚煤规律　出处：《煤炭科学技术》2017年01期 　论文类型：期刊论文

【摘要】：基于沉积环境与聚煤规律存在着密切的关系,为得出哆嗦公马矿区的聚煤规律,通过实测野外地层剖面及钻孔岩心观察,运用沉积学、煤田地质学的基本理论及方法,研究了哆嗦公马矿区中侏罗世含煤岩系的岩相类型、沉积环境及煤层展布规律。结果表明,该区含煤岩系发育辫状河、辫状河三角洲和湖泊三种沉积环境类型,区域上的厚煤层主要形成于辫状河三角洲沉积环境中。聚煤作用明显受古构造及沉积环境的控制,印支运动控制了侏罗系沉积基底的演化,燕山运动则影响了整个湖盆的发育,此时沿湖泊边缘发育的辫状河三角洲聚煤环境较为发育,从而形成了该区主采煤层下2煤及下1煤。富煤带呈北西-南东向的条带状展布,聚煤中心位于研究区东南部的ZK0-3及ZK11-3钻孔附近。
[Abstract]:Based on the close relationship between sedimentary environment and coal accumulation law, in order to obtain the coal accumulation law in the Jijigongma mining area, the basic theory and method of sedimentology and coal geology are applied through the observation of field stratigraphic profile and drilling core. The lithofacies type, sedimentary environment and distribution of coal seam in the Middle Jurassic coal-bearing rock series of Shijiangma mining area are studied. The results show that there are three types of sedimentary environment: braided river, braided river delta and lake in the coal-bearing rock series in this area. The thick coal seam is mainly formed in the sedimentary environment of braided river delta. Coal accumulation is obviously controlled by paleotectonics and sedimentary environment. Indosinian movement controls the evolution of Jurassic sedimentary basement, while Yanshanian movement affects the development of the whole lake basin. The coal accumulation environment of braided river delta along the lake margin is relatively developed, thus forming 2 coal and 1 lower coal under the main coal seam in this area. The coal accumulation center is located near the ZK0-3 and ZK11-3 boreholes in the southeast of the study area.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;青海煤炭地质一五勘探队;青海煤炭地质局;
【基金】：中国地质调查局油气资源调查中心资助项目(1212011220794)
【分类号】：P618.11

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