陕北侏罗纪煤田三角洲平原沉积环境及其岩石力学特征

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英文篇名：Study on sediment environment and rock mechanics characteristics of the delta plain of Jurassic coalfield in northern Shaanxi 作者：王海军 ; 马良 英文作者：WANG Haijun;MA Liang;Xi'an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.;Department of Geology & State Key Laboratory of Continental Dynamics,Northwest University;State Key Laboratory of Continental Dynamics,Northwest University; 关键词：煤层顶板 ; 岩石力学特征 ; 岩心测试 ; 工程地质编录 ; 沉积环境 ; 陕北侏罗纪煤田 英文关键词：coal seam roof;;rock mechanics characteristic;;core test;;engineering geological record;;sedimentary environment;;Jurassic coalfield in northern Shaanxi 中文刊名：MDKT 英文刊名：Coal Geology & Exploration 机构：中煤科工集团西安研究院有限公司;西北大学地质学系;西北大学大陆动力学国家重点实验室; 出版日期：2018-09-25 15:51 出版单位：煤田地质与勘探 年：2019 期：v.47;No.273 基金：中煤科工集团西安研究院有限公司科技创新基金项目(2013XAYQN002);; 国家科技重大专项任务(2016ZX05045-002-001)~~ 语种：中文; 页：MDKT201903011 页数：9 CN：03 ISSN：61-1155/P 分类号：63-71

摘要

三角洲平原沉积环境是陕北侏罗纪煤田煤炭资源的主要形成环境之一,为获得不同环境煤层顶板岩石力学参数特征,进一步探究沉积环境与岩石力学特征之间的关系,首先从区域沉积环境分析入手,然后运用岩心精细描述、沉积构造分析、地球物理测井分析等技术,识别微相、划分顶板沉积微相类型及其组合特征;之后对不同沉积环境中不同位置、不同岩性的岩石进行系统地分层采样和测试分析;最后综合分析煤层顶板各沉积微相的岩石力学特征。结果表明,煤层直接顶板以泥岩、粉砂质泥岩为主,形成于三角洲平原亚相中的沼泽、湖泊沉积微相,局部见粉砂岩、细粒砂岩形成于分流河道和天然堤微相;基本顶主要以中–细粒砂岩为主,形成于分流河道沉积微相;沉积环境不仅控制煤层顶板岩性分布而且控制岩石力学参数及其含水层富水性的分布,其中,湖泊、沼泽相泥岩顶板区是顶板支护的重点部位,多期分流河道砂岩叠置顶板区是未来矿井防治水以及探放水的重点区域。
        Delta plain sedimentary environment is one of the coal-forming environments of the coal resources of Jurassic coalfield in northern Shaanxi. In order to get the rock mechanics parameters and characteristics of coal seam roof in different environments and to further investigate the relationship between the sedimentary environments and the rock mechanics characteristics, firstly from the analysis of the regional sedimentary environments, then by using techniques such as accurate core description, sedimentary structural analysis, facies analysis of geophysical logging, the microfacies were recognized, the sedimentary microfacies types of roof and their combination characteristics were classified. Later,rock samples of different lithology at different position were collected by layer, tested and analyzed. Finally, the rock mechanics characteristics of different microfacies of seam roof were analyzes comprehensively. The results show that sedimentary environment not only controlled coal seam roof lithologic distribution but also controlled the rock mechanics parameters and the distribution of water yield properties of aquifer. Direct roof of coal seam in the study area dominated by mudstone and silty mudstone, was formed in the delta plain sub-facies of swamps, locally siltstone and fine-grained sandstone were formed in shunt rivers and natural embankment microfacies. The basic roof lithology is dominated by medium and fine-grained sandstone formed in the branch river and onshore natural levee sedimentary microfacies, coal seam roof stability is medium, the main roof sandstone aquifer is the major risk for mine production in the future, among them, lake and swamp mudstone roof area is the key part of roof support, multi-stage distributary channel sandstone overlapping top plate area is the key area for mine water prevention and drainage in the future.

引文

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