衛(wèi)寧平原第四系含水層滲透結(jié)構(gòu)分析
發(fā)布時間：2018-11-07 19:57
【摘要】：對于區(qū)域滲透結(jié)構(gòu)的分析,傳統(tǒng)的做法是根據(jù)研究區(qū)水文地質(zhì)條件和鉆孔資料定性地劃分滲透結(jié)構(gòu)分區(qū)。但是針對于大區(qū)域研究區(qū)不免有些失真,尤其是在鉆孔資料不足和地質(zhì)條件比較復雜的區(qū)域,這種不確定性會放大化,建立的數(shù)值模型的不確定性也會被放大,滲透結(jié)構(gòu)的數(shù)據(jù)從而失去有效性。為避免出現(xiàn)上述情況,隨著地質(zhì)統(tǒng)計學理論和計算機技術(shù)的不斷發(fā)展,為彌補克里格估值理論存在的缺陷,條件模擬以體現(xiàn)空間數(shù)據(jù)的波動性的優(yōu)點而逐漸被廣泛應(yīng)用于礦產(chǎn)、石油、水利等各個方面。這也為傳統(tǒng)滲透結(jié)構(gòu)的不確定性向定量化方向的轉(zhuǎn)變提供了一個有效途徑。本文以衛(wèi)寧平原為研究對象,該地區(qū)區(qū)域面積較大,地質(zhì)構(gòu)造復雜,鉆孔資料較少,所以本次利用28條物探剖面線資料結(jié)合鉆孔資料,建立第四系三維地質(zhì)模型。對巖性進行變異結(jié)構(gòu)分析,對A、B區(qū)分別進行序貫高斯模擬,根據(jù)電阻率和巖性關(guān)系,利用水文地質(zhì)剖面圖和鉆孔柱狀圖對模型進行了驗證。最后,A區(qū)選擇第16次和B區(qū)選擇第20次模擬結(jié)果對衛(wèi)寧平原進行滲透結(jié)構(gòu)分析。結(jié)論如下:(1)A區(qū):垂直于黃河剖面,從研究區(qū)邊界到黃河,主要是基于山前洪積、沖洪積以及黃河的沖積形成的,所以電阻率變化不明顯,垂直方向滲透結(jié)構(gòu)變化不明顯;沿黃河兩側(cè),電阻率呈現(xiàn)高電阻低電阻相間,這主要是由于河流的二元結(jié)構(gòu)造成的,下部為粗沙和礫石組成的河床沉積物,上部為細沙或粘土組成的河漫灘沉積物;西部沙漠區(qū)為細砂、粉細砂,電阻率較低,第四系厚度較大,透水性較好;中衛(wèi)地區(qū)呈現(xiàn)單一的第四系砂粘土夾卵礫石層,有較好的含水條件,中寧一帶,沿黃河兩側(cè)呈現(xiàn)多層韻律結(jié)構(gòu),電阻率大的基本為砂礫石,電阻率較小的為砂粘土,粉細砂等,區(qū)域呈現(xiàn)多層潛水含水層結(jié)構(gòu)。(2)B區(qū):西北丘陵臺地區(qū)第四系覆蓋較薄,有第三系或者古生代地層出露,滲透性極差,富水性也較差。東南方向恩和、鳴沙以及渠口附近地區(qū)模擬出的電阻率較大,這個地段以第四系砂粘土夾卵礫石層為主。
[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.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P641.2
本文編號：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.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P641.2
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