大南湖矿区侏罗系弱胶结含水介质及水动力特征研究

发布时间：2018-06-08 03:34

本文选题：西部地区 + 侏罗系含水层　；参考：《中国矿业大学》2017年硕士论文

【摘要】：本文围绕我国西部煤炭资源高强度开发过程中,作为新疆建设的四大煤炭基地之一的哈密煤炭基地建设中所面临的特殊水文地质问题,以及对哈密煤田各矿井生产造成的重大影响和严重水害威胁等核心问题,以哈密煤田侏罗系富煤区的大南湖矿区为研究区,开展了该富煤地层的控水机制、介质特征、水动力特征及防治水关键技术等方面的基础理论研究,并应用于大南湖五号井首采面的顶板防治水工作中,主要取得了如下成果:(1)通过野外调查、水质分析、同位素分析等多种手段,系统研究了哈密煤田的区域水文地质条件及沉积演化过程,查明了以哈密煤田大南湖矿区为代表的天山雪融水为区域补给源,沙尔湖隆起缺失口为地下水补给通道的隐伏湖床的形成及演变过程,并揭示了在干旱半干旱沙漠地区隐伏湖床对煤田开采的水文地质控制规律;(2)通过扫面电镜及压汞实验获取了研究区侏罗系砂岩含水层的孔隙结构特征,测试表明:III-1含水层的孔隙度平均高达19.9%,砂岩平均孔隙度达到18.2%,远高于东部石炭-二叠系砂岩的孔隙度(1.1-2%),具有孔隙-裂隙双重发育、孔隙度高的介质特征,为地下水的赋存和运移提供较优的介质条件;(3)通过开展大型群孔抽水试验及求参,结合研究区侏罗系含水层的介质特征,采用Boulton模型计算,获取了研究区III-1含水层渗透系数K=4.33 m/d,单位涌水量q=1.18 l/s m,并揭示了该含水层具有的滞后特征及反映出的孔隙-裂隙双重介质发育的基本规律。结合水化学资料分析,获取了该含水层具有高渗透性、高矿化度、以静储量为主的水文地质特征;(4)针对研究区隐伏湖床补给含水层的介质条件、结构特征、控水机制及流场演化规律,提出了18煤开采“上防下疏”防治水关键技术,并成功应用于首采面生产实践。
[Abstract]:This paper focuses on the special hydrogeological problems in the construction of Hami coal base, one of the four major coal bases constructed in Xinjiang, in the process of high-intensity exploitation of coal resources in the western part of China. As well as the key problems such as the great influence and serious water hazard threat caused by the coal mine production in Hami coalfield, the water control mechanism and medium characteristics of the coal-rich strata are carried out in the Dananhu mining area of Jurassic coal rich area of Hami coalfield as the study area. The basic theoretical research on hydrodynamic characteristics and key technologies of water control, and its application to the roof control of the first mining surface of the No. 5 well in Danan Lake, has mainly achieved the following results: 1) through field investigation, water quality analysis, The regional hydrogeological conditions and sedimentary evolution process of Hami coalfield are systematically studied by isotopic analysis, and the Tianshan Xuejingshui, represented by Dananhu mining area of Hami coalfield, is found as the regional recharge source. The formation and evolution of the hidden lake bed with the missing mouth of the Schall Lake uplift is the groundwater recharge channel. The hydrogeological control law of hidden lake bed to coal mining in arid and semi-arid desert area is revealed. The pore structure characteristics of Jurassic sandstone aquifer in the study area are obtained by scanning electron microscope and mercury injection experiment. The test results show that the porosity of the aquifer is as high as 19.9 and the average porosity of sandstone reaches 18.20.It is much higher than that of the eastern Carboniferous Permian sandstone with porosity of 1.1-20.It has the characteristics of dual development of porosity and fissure, and high porosity. Through carrying out large group hole pumping test and obtaining parameters, combining with the characteristics of Jurassic aquifer in the study area, the Boulton model is used to calculate the characteristics of the Jurassic aquifer in the study area, so as to provide a better medium condition for the occurrence and migration of groundwater. The permeability coefficient of the III-1 aquifer K _ (4.33) m / d and the unit water inflow Q ~ (1) ~ (18) l / s ~ (m) are obtained, and the hysteresis characteristics of the aquifer and the basic law of the development of the porosity / fissure dual media are revealed. Based on the analysis of hydrochemical data, the hydrogeological characteristics of the aquifer with high permeability, high mineralization and mainly static reserves are obtained. Based on the mechanism of water control and the evolution of flow field, the key technology of water control in 18 coal mining is put forward, and it is successfully applied to the production practice of the first mining face.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745

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