淮南煤田水文地质单元划分

发布时间：2018-05-24 15:00

本文选题：淮南煤田 + 构造控水　；参考：《安徽理工大学》2015年硕士论文

【摘要】：淮南煤田是中国东部地区主要的产煤基地,构造单元属华北板块豫淮坳陷沉煤盆地,地层受构造运动改造,区内构造极其发育,岩体工程力学性质较差,饱受各种水患的侵害。原来根据南北向对冲推覆纬向断层将淮南煤田划分为南中北三个水文地质单元,分界断层是阜凤断裂和尚塘-明龙山断裂。随着淮南地区水资源的开发利用以及煤田深部煤炭资源的解放需求与日俱增,老的分区方案显得过于简单、片面,无法满足水资源开发和矿井水害防治需求。本次淮南煤田水文地质单元划分及区域水文地质图件编制,以期制定更能够反映两淮地区水文地质特征的分区方案,为区域水资源开发利用和矿井水患防治提供依据。淮南地区处华北板块南缘逆冲推覆系统的前锋带,南北向都发育有大型的阻水断裂,这些断裂两侧水文地质特征有着明显区别。大型控水断裂作为最主要的分区因素,这点与老分区方案的意图是一致的,除此之外,新方案综合考虑了区域性阻水断裂两侧水文地质特征的差异。阜凤逆冲断层以南为逆冲推覆系统的前陆位置,地层结构极其复杂,因而不同区域水文地质条件差别很大,如淮南老矿区有些区域寒武系灰岩出露地表,直接接受邻区松散层水的侧向补给和大气降水,形成降落漏斗；基岩为太古界片麻岩的区域,松散层水对原地系统的垂向补给通道开放、水量很大等。阜凤逆冲断层以北区域主要是巨厚松散层覆盖基岩,松散层厚度以及底含性质基本决定了基岩含水层的补给条件。基于地质构造、地层条件、补径排条件、水动力条件以及水化学场等多因素综合考虑,淮南地区水文地质单元划分新方案拟作三级划分,一级单元以区域性控水构造为划分依据,分为南区、中区和北区；二级单元在一级单元的基础上,分为松散层覆盖区、推覆体区以及灰岩补给区；三级单元在二级单元的基础上,松散层覆盖区分为“红层”覆盖区、四含补给区、三隔覆盖区和其他含水层覆盖区,推覆体区分为片麻岩区、推覆体灰岩区、推覆体煤系地层区,灰岩补给区分为灰岩裸露区和松散层补给灰岩区。
[Abstract]:Huainan coalfield is the main coal-producing base in eastern China. The tectonic unit is a submersible coal basin in the Yuhuai depression of North China plate. The strata are reformed by tectonic movement, the structure is extremely developed in the area, the mechanical properties of rock mass engineering are poor, and they are affected by various kinds of floods. The Huainan coalfield is divided into three hydrogeological units in the south and north according to the north and south fault. The boundary fault is the Fufeng fault and the Tongtang-Minglongshan fault. With the development and utilization of water resources in Huainan area and the increasing demand for the liberation of deep coal resources in coal fields, the old zoning plan is too simple and one-sided to meet the needs of water resources development and mine water disaster prevention. The division of hydrogeological units and the compilation of regional hydrogeological maps in Huainan coalfield are aimed at drawing up a zoning scheme which can reflect the hydrogeological characteristics of the Huanghuai area and provide the basis for the development and utilization of regional water resources and the prevention and control of mine water hazards. Huainan area is located in the front zone of the thrust nappe system in the southern margin of the North China plate. There are large water-blocking faults in the south-north direction, and the hydrogeological characteristics on the two sides of these faults are obviously different. Large-scale water-controlled fault is the most important factor in zoning, which is consistent with the intention of the old zoning scheme. In addition, the new scheme takes into account the differences of hydrogeological characteristics on both sides of the regional water-blocking fault. The south of Fufeng thrust fault is the Foreland position of thrust-nappe system, and the stratigraphic structure is extremely complex, so the hydrogeological conditions vary greatly in different regions, such as the exposed surface of Cambrian limestone in some regions of Huainan mining area. It directly receives the lateral recharge and atmospheric precipitation of the loose bed water in the adjacent area and forms a falling funnel. The bedrock is the Archean area of gneiss and the loose layer water is open to the vertical recharge channel of the in-situ system and the amount of water is very large. To the north of Fufeng thrust fault, the overburden of bedrock is mainly composed of very thick and loose layer, and the thickness of loose layer and the property of bottom bearing basically determine the recharge condition of bedrock aquifer. Based on the comprehensive consideration of geological structure, stratigraphic conditions, diameters and drainage conditions, hydrodynamic conditions and hydrochemical fields, the new scheme of hydrogeological unit division in Huainan area is proposed to be divided into three levels. On the basis of regional water control structure, the first grade unit is divided into the south, middle and north regions, the second grade unit is divided into loose overburden area, nappe area and limestone recharge area on the basis of the first class unit. On the basis of the secondary unit, the loose layer cover is divided into "red layer" coverage area, four recharge area, three cover area and other aquifer coverage area, and the nappe is divided into gneiss area and nappe limestone area, In the nappe coal measure formation area, limestone recharge is divided into bare limestone area and loose layer recharge limestone area.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.461

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