新疆三塘湖盆地控煤因素分析

发布时间：2019-04-02 16:21

【摘要】：三塘湖煤田位于新疆维吾尔自治区东部的哈密地区,是新疆维吾尔自治区为数不多的尚未开发的整装煤田之一。本文利用2006-2012年新疆煤田地质局一六一煤田地质勘探队在三塘湖、淖毛湖等地区开展工作取得的煤炭勘查资料,分析煤田大地构造、地层层序、成煤环境、沉积演化、聚煤规律等控煤因素,为煤田的进一步勘探开发及类似煤田的找煤工作提供参考。取得的主要认识如下:(1)通过对2个重要不整合面和2个局部不整合面、冲刷面的识别,将三塘湖盆地中下侏罗统划分为3个三级层序,并根据地层叠置样式、岩相、岩性的变化从而细分出了低位、湖侵以及高位体系域,共划分为9个体系域,其中,SQ1相当于八道湾组,SQ2相当于三工河组,SQ3相当于西山窑组。这种层序划分方法可在全区的钻井剖面之间进行良好地对比。(2)从中、下侏罗统地层颜色、化石和孢粉资料中分析,中下侏罗世为亚热带潮湿气候环境,盆地中绿色植物大量的生长繁殖给各个成煤期提供了非常丰富的物质来源。北缘大哈普提克山、苏图海山、双燕山提供了主要的物源。(3)通过对岩芯样品、测井资料和分析化验资料等的研究,确定研究区中的目的层段主要发育三角洲、扇三角洲、沼泽、湖泊、泛滥平原等5种主要相类型,并细分为10种亚相和22种微相。(4)研究了等时地层格架下的沉积相特征,并通过剖面相、单井相、砂地比等值线和砂岩等值线等基础图件编制,明确了9个体系域的沉积相展布。三塘湖盆地侏罗纪沉积相类型丰富多彩,变化复杂但很有规律,沉积相带的展布格局受构造控制,各层序沉积时期的沉积相展布格局具有继承性。(5)应用基准面和可容空间变化理论建立三塘湖盆地侏罗纪中下统层序构成模式,分析层序格架下的聚煤规律。厚煤层发育主要受湖平面变化、古地貌和沉积环境的控制,在低位和高位时期的三角洲平原区是最有利的成煤区。
[Abstract]:The Santanghu coalfield is located in the Hami area of the eastern part of the Xinjiang Uygur Autonomous Region. It is one of the few complete coal fields that have not been developed in the Xinjiang Uygur Autonomous Region. This paper makes use of the coal exploration data of the geological exploration team of the coal-field geological bureau of Xinjiang from 2006 to 2012 to carry out the work in the areas such as the Santanghu Lake and the Qinghai Lake, to analyze the coal-control factors such as the coal-field geotectonics, the stratigraphic sequence, the coal-forming environment, the sedimentary evolution, the coal-gathering law and so on. It provides a reference for further exploration and development of the coal field and the coal-finding of similar coal fields. The main recognition results are as follows: (1) The middle and lower Jurassic in the Santanghu basin are divided into three third-order sequences by the identification of the two important non-integral surfaces and the two local non-integral surfaces and the erosion surface, and the low-order is broken down according to the change of the stacking pattern, the lithofacies and the lithology of the base area, The area of the lake and the high-order system is divided into 9 system domains, where SQ1 is equivalent to the three-working group, SQ2 is equivalent to the three-work group, and SQ3 is equivalent to the Xishan kiln group. The sequence division method can be well compared between the drilling sections in the whole region. (2) From the analysis of the formation color, the fossil and the spore-pollen data from the middle and lower Jurassic, the middle and lower Jurassic is a subtropical humid climate environment, and the growth and propagation of the green plants in the basin provide a very rich source of material for each coal-forming period. The main source of material is provided in the northern edge of the Daban Mountain, the Su Tuhai Mountain and the double-Yanshan. (3) Five main types of facies, such as delta, fan delta, marsh, lake, and flood plain, are determined by the study of core sample, logging data and analysis and test data, and 10 subfacies and 22 micro-phases are subdivided. (4) The characteristics of the sedimentary facies under the isochronal formation framework are studied, and the sedimentary facies distribution of the nine system domains is defined by the profile facies, the single well phase, the sand ground ratio contour line and the sandstone contour. The type of the Jurassic sedimentary facies in the Santanghu basin is rich and colorful, the change is complicated but very regular, the distribution pattern of the sedimentary facies belt is controlled by the structure, and the distribution pattern of the sedimentary facies in the sedimentary period of each sequence has the inheritance. (5) Using the theory of reference plane and volume change theory to establish the model of the middle and lower sequence of the three-tango-lake basin, the regularity of the coal-coal in the sequence framework is analyzed. The development of thick coal seam is mainly controlled by the change of the lake level, the ancient geomorphic and the sedimentary environment, and the delta plain area in the low and high periods is the most favorable coal-forming area.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11

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