卫宁平原第四系含水层渗透结构分析
发布时间：2018-11-07 19:57
【摘要】：对于区域渗透结构的分析,传统的做法是根据研究区水文地质条件和钻孔资料定性地划分渗透结构分区。但是针对于大区域研究区不免有些失真,尤其是在钻孔资料不足和地质条件比较复杂的区域,这种不确定性会放大化,建立的数值模型的不确定性也会被放大,渗透结构的数据从而失去有效性。为避免出现上述情况,随着地质统计学理论和计算机技术的不断发展,为弥补克里格估值理论存在的缺陷,条件模拟以体现空间数据的波动性的优点而逐渐被广泛应用于矿产、石油、水利等各个方面。这也为传统渗透结构的不确定性向定量化方向的转变提供了一个有效途径。本文以卫宁平原为研究对象,该地区区域面积较大,地质构造复杂,钻孔资料较少,所以本次利用28条物探剖面线资料结合钻孔资料,建立第四系三维地质模型。对岩性进行变异结构分析,对A、B区分别进行序贯高斯模拟,根据电阻率和岩性关系,利用水文地质剖面图和钻孔柱状图对模型进行了验证。最后,A区选择第16次和B区选择第20次模拟结果对卫宁平原进行渗透结构分析。结论如下:(1)A区:垂直于黄河剖面,从研究区边界到黄河,主要是基于山前洪积、冲洪积以及黄河的冲积形成的,所以电阻率变化不明显,垂直方向渗透结构变化不明显;沿黄河两侧,电阻率呈现高电阻低电阻相间,这主要是由于河流的二元结构造成的,下部为粗沙和砾石组成的河床沉积物,上部为细沙或粘土组成的河漫滩沉积物;西部沙漠区为细砂、粉细砂,电阻率较低,第四系厚度较大,透水性较好;中卫地区呈现单一的第四系砂粘土夹卵砾石层,有较好的含水条件,中宁一带,沿黄河两侧呈现多层韵律结构,电阻率大的基本为砂砾石,电阻率较小的为砂粘土,粉细砂等,区域呈现多层潜水含水层结构。(2)B区:西北丘陵台地区第四系覆盖较薄,有第三系或者古生代地层出露,渗透性极差,富水性也较差。东南方向恩和、鸣沙以及渠口附近地区模拟出的电阻率较大,这个地段以第四系砂粘土夹卵砾石层为主。
[Abstract]:For the analysis of regional osmotic structure, the traditional method is to divide the percolation structure qualitatively according to the hydrogeological conditions and borehole data in the study area. But there is some distortion in the study area of large area, especially in the area where the borehole data is insufficient and the geological conditions are complicated, the uncertainty will be magnified, and the uncertainty of the established numerical model will be magnified. Osmosis the structure of the data thus losing validity. In order to avoid the above situation, with the continuous development of geostatistics theory and computer technology, in order to make up for the shortcomings of Kriging valuation theory, conditional simulation has gradually been widely used in mineral resources to reflect the advantages of spatial data volatility. Oil, water conservancy, etc. It also provides an effective way to change the uncertainty of the traditional osmotic structure to the quantitative direction. In this paper, the Weining Plain is taken as the research object. The area is large, the geological structure is complex, and the borehole data are less. Therefore, the Quaternary three-dimensional geological model is established by using the data of 28 geophysical profiles combined with the borehole data. According to the relationship between resistivity and lithology, the model was verified by hydrogeological profile and borehole histogram. Finally, the osmotic structure of Weining Plain was analyzed by the simulation results of the 16th and the 20th times of A and B, respectively. The conclusions are as follows: (1) area A: perpendicular to the profile of the Yellow River, from the boundary of the study area to the Yellow River, the resistivity change is not obvious because it is mainly based on the frontal flood, alluvial and alluvial deposits of the Yellow River. The perpendicular osmotic structure change is not obvious; Along the two sides of the Yellow River, the resistivity is interphase with high resistivity and low resistance, which is mainly caused by the binary structure of the river. The lower part of the river is composed of coarse sand and gravel, and the upper part is the alluvial sediment composed of fine sand or clay. The western desert area is fine sand, fine silty sand, low resistivity, large Quaternary thickness and good water permeability. In Zhongwei area, there is a single quaternary sand clay gravelly layer with good water content. In Zhongning area, along the two sides of the Yellow River, there is a multi-layer rhythmic structure, the resistivity of which is mostly sandy gravel, and the resistivity is relatively low, such as sand clay, fine silt, etc. (2) area B: the Quaternary in the northwest hilly area is thin, the Tertiary or Paleozoic strata are exposed, the permeability is very poor, and the water rich is poor. In the southeast, the resistivity of Enhe, Mingsha and the area near the canal mouth is large, and this area is dominated by the quaternary sand clay and gravel layer.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.2
本文编号：2317413
[Abstract]:For the analysis of regional osmotic structure, the traditional method is to divide the percolation structure qualitatively according to the hydrogeological conditions and borehole data in the study area. But there is some distortion in the study area of large area, especially in the area where the borehole data is insufficient and the geological conditions are complicated, the uncertainty will be magnified, and the uncertainty of the established numerical model will be magnified. Osmosis the structure of the data thus losing validity. In order to avoid the above situation, with the continuous development of geostatistics theory and computer technology, in order to make up for the shortcomings of Kriging valuation theory, conditional simulation has gradually been widely used in mineral resources to reflect the advantages of spatial data volatility. Oil, water conservancy, etc. It also provides an effective way to change the uncertainty of the traditional osmotic structure to the quantitative direction. In this paper, the Weining Plain is taken as the research object. The area is large, the geological structure is complex, and the borehole data are less. Therefore, the Quaternary three-dimensional geological model is established by using the data of 28 geophysical profiles combined with the borehole data. According to the relationship between resistivity and lithology, the model was verified by hydrogeological profile and borehole histogram. Finally, the osmotic structure of Weining Plain was analyzed by the simulation results of the 16th and the 20th times of A and B, respectively. The conclusions are as follows: (1) area A: perpendicular to the profile of the Yellow River, from the boundary of the study area to the Yellow River, the resistivity change is not obvious because it is mainly based on the frontal flood, alluvial and alluvial deposits of the Yellow River. The perpendicular osmotic structure change is not obvious; Along the two sides of the Yellow River, the resistivity is interphase with high resistivity and low resistance, which is mainly caused by the binary structure of the river. The lower part of the river is composed of coarse sand and gravel, and the upper part is the alluvial sediment composed of fine sand or clay. The western desert area is fine sand, fine silty sand, low resistivity, large Quaternary thickness and good water permeability. In Zhongwei area, there is a single quaternary sand clay gravelly layer with good water content. In Zhongning area, along the two sides of the Yellow River, there is a multi-layer rhythmic structure, the resistivity of which is mostly sandy gravel, and the resistivity is relatively low, such as sand clay, fine silt, etc. (2) area B: the Quaternary in the northwest hilly area is thin, the Tertiary or Paleozoic strata are exposed, the permeability is very poor, and the water rich is poor. In the southeast, the resistivity of Enhe, Mingsha and the area near the canal mouth is large, and this area is dominated by the quaternary sand clay and gravel layer.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.2
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