| 砂岩韵律层理对地下水封洞库水封效果的影响 |
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| 引用本文： | 李印,陈雪见,姜俊浩.砂岩韵律层理对地下水封洞库水封效果的影响[J].油气储运,2022(2). |
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| 作者姓名： | 李印 陈雪见 姜俊浩 |
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| 作者单位： | 中国石油天然气管道工程有限公司 |
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| 摘 要： | 随着国家战略储备规模的不断扩大,中国块状结晶岩体的可选范围受到诸多因素限制,突破砂岩区地下水封洞库建设技术可以极大提高地下洞库选址适用范围。为探究在砂岩区建库的可行性,以西南某砂岩区建库选址为背景,利用FEFLOW软件建立水平层理、倾斜10°层理、倾斜50°层理3种工况对应的砂岩区地下水封洞库渗流场模型,并假定2~3条厚层泥岩,放大低渗透性泥岩层对于水封环境的破坏程度,模拟分析砂岩韵律层理对地下洞库水封效果的影响。结果表明:厚层泥岩对于倾斜50°层理工况的影响最小,对于水平层理工况的影响最大,而厚层泥岩已成为地下水环境中的隔水层,严重影响甚至破坏了水封环境。基于此,在模型中针对性设置水平水幕孔、垂直水幕或斜向水幕系统,模拟结果表明:水封效果得到明显改善。在实际工程中,可通过下移水平水幕系统、特定区域增设垂直水幕或斜向水幕系统等实现更好的水封效果。研究成果可为砂岩区地下储油洞库水封设计及选址提供理论参考。
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| 关 键 词： | 地下水封洞库 砂岩 层理 厚层泥岩 渗流场 |
Influence of sandstone bedding on water-sealed effect of underground water-sealed caverns |
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| LI Yin,CHEN Xuejian,JIANG Junhao.Influence of sandstone bedding on water-sealed effect of underground water-sealed caverns[J].Oil & Gas Storage and Transportation,2022(2). |
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| Authors: | LI Yin CHEN Xuejian JIANG Junhao |
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| Institution: | (China Petroleum Pipeline Engineering Corporation) |
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| Abstract: | With the continuous expansion of national strategic reserve scale, less massive crystalline rock mass is available in China due to the limitation of various factors. Therefore, making a breakthrough in the construction technology of an underground water-sealed cavern in sandstone area can greatly broaden the site available for the underground caverns. In order to study the feasibility of cavern construction in sandstone area, the seepage field models of underground caverns in sandstone area under three working conditions of horizontal bedding, inclined 10° bedding and inclined 50° bedding were established with the FEFLOW software under the background of site selection for cavern construction in a sandstone area in southwest China. It is assumed that 2 to 3 layers of thick mudstone exist in the sandstone to amplify the damage degree of low-permeability mudstone layers to the water-sealed environment, so as to better study the design technology of water seal for the underground caverns in sandstone area. The simulation results show that the thick mudstone layers have the least influence on the inclined 50° bedding and the greatest influence on the horizontal bedding. The thick mudstone layers, as the water barrier in the groundwater environment, seriously affect or even destroy the water-sealed environment. By adjusting the model in a targeted way such as setting horizontal water curtain holes and a vertical or oblique water curtain system, the water-sealed effect is improved obviously. In the actual project, water seal can be realized by moving down the horizontal water curtain system, or setting a vertical or oblique water curtain system in specific areas. The results can provide theoretical reference for the design and site selection of underground water-sealed caverns in sandstone area. |
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| Keywords: | underground water-sealed cavern sandstone bedding thick mudstone seepage field |
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