基于地质表征的非均质冲积含水层水文地质初步概念模型的建立

M. Gomo, G. V. Tonder
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引用次数: 2

摘要

通过露头测绘和现场15个钻孔的岩性测井分析,对非均质冲积河道含水层进行了地质表征。研究的目的是建立一个初步的水文地质概念模型。利用降头渗透率仪在实验室测试了12个岩性样品,以确定每个松散岩性单元的水力导电性。在研究现场观察到页岩和钙质露头。该地点的露头测绘也表明,在上面的松散沉积物和下面基岩的页岩之间存在一个接触面,在那里形成了地下水排放区。地质测井表明,冲积河道含水层由三种不同的层状松散沉积物质(钙质、粘土粉砂、砂砾沉积地层)组成,它们覆盖在低渗透页岩地层上。地质岩性揭示了钻孔间松散沉积物的性质和类型的空间差异,这些松散沉积物会影响含水层系统中地下水的赋存和流动。由大中型卵石组成的砂砾含水层在概念上是主要的水力导电性单元,实验室测定的平均水力导电性为8.5米/天。利用井眼组合计算的水力梯度范围为0.013-0.022。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a Preliminary Hydrogeology Conceptual Model for a Heterogeneous Alluvial Aquifer using Geological Characterization
Geological characterization of a heterogeneous alluvial channel aquifer was conducted using outcrop mapping and analysis of lithological logs from 15 boreholes drilled at the site. The study was aimed at developing a preliminary hydrogeology conceptual model. A total of 12 lithological samples were tested in the laboratory using falling head permeameter to determine the hydraulic conductivity of each unconsolidated lithology unit. Shale and calcrete outcrops were observed on the study site. Outcrop mapping on the site also indicated the presence of a contact plane between the overlying unconsolidated sediments and the shale of the underlying bedrock where a groundwater discharge zone has been created. Geology logs show that the alluvial channel aquifer comprises of three distinct layered unconsolidated sediment materials (calcrete, clay-silt, sand-gravel deposited formations) that overlie low permeable shale formation. Geological lithology revealed the spatial variation in the nature and type of unconsolidated sediments deposits between boreholes that can influence groundwater occurrence and flow in the aquifer system. The gravel-sand aquifer layer that consists of medium to large pebbles is conceptually the main hydraulically conductive unit with an average laboratory determined hydraulic conductivity of 8.5 m/day. Hydraulic gradient calculated using a combination of boreholes ranges from 0.013-0.022.
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