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曲建军, 曹彪, 宋大钊, 杨连枝, 何生全. 近海地下石油储备库海水入侵风险研究[J]. 水文地质工程地质, 2023, 50(6): 184-192. doi: 10.16030/j.cnki.issn.1000-3665.202212006
引用本文: 曲建军, 曹彪, 宋大钊, 杨连枝, 何生全. 近海地下石油储备库海水入侵风险研究[J]. 水文地质工程地质, 2023, 50(6): 184-192. doi: 10.16030/j.cnki.issn.1000-3665.202212006
shu
QU Jianjun, CAO Biao, SONG Dazhao, YANG Lianzhi, HE Shengquan. Study on the risk of seawater intrusion in offshore underground oil reserve[J]. Hydrogeology & Engineering Geology, 2023, 50(6): 184-192. doi: 10.16030/j.cnki.issn.1000-3665.202212006
Citation: QU Jianjun, CAO Biao, SONG Dazhao, YANG Lianzhi, HE Shengquan. Study on the risk of seawater intrusion in offshore underground oil reserve[J]. Hydrogeology & Engineering Geology, 2023, 50(6): 184-192. doi: 10.16030/j.cnki.issn.1000-3665.202212006
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近海地下石油储备库海水入侵风险研究

  • 1.

    中化能源物流有限公司，浙江 舟山　316000

  • 2.

    北京科技大学土木与资源工程学院，北京　100083

  • 基金项目: 国家自然科学基金项目（51774023）
详细信息
    作者简介: 曲建军（1972-），男，高级工程师，主要从事地下石油储运研究。E-mail： qujianjun@sinochem.com
    通讯作者: 曹彪（1998-），男，硕士研究生，主要从事地下石油储运研究。E-mail： caobiao0323@163.com

  • 中图分类号: P641

Study on the risk of seawater intrusion in offshore underground oil reserve

  • 1.

    Sinochem Energy Logistics Co. Ltd., Zhoushan, Zhejiang　316000, China

  • 2.

    School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing　100083, China

More Information

    摘要

  • 地下石油储备库于近海处建立，可降低石油运输成本，同时有较强的军事意义。但是临近海岸线，海水易入侵库区，导致库区内金属结构腐蚀，使储备库的使用年限降低。以某近海地下石油储备库工程为背景，构建了综合断层、节理密集带、导水通道等15种地质结构的精细化三维水文地质模型，研究了库区自然状态下和运行期的地下水渗流场及溶质运移场，模拟海水入侵风险。研究表明：（1）自然状态下地下石油储备库无海水入侵。（2）运行期只在洞库顶部以上25 m处设置四周超出洞室50 m、水幕孔间距为10 m、孔径0.11 m的水平水幕时，不能有效防治海水入侵。（3）洞库运行9 a时，3#洞室东南侧Cl−物质的量浓度超过7 mol/m3，海水开始入侵洞室群；运行22~23 a时，海水入侵速率最快；运行41 a 时，3#洞室东南侧Cl−物质的量浓度超过143 mol/m3，海水入侵达到对钢筋的强腐蚀程度；运行50 a时，除1#洞室外其余所有洞室均受到海水入侵，3#、4#洞室有部分区域达到强腐蚀程度，海水入侵最严重。建议增设垂直水幕等设施，以增强对海水入侵的防治。研究成果可为近海地区地下石油储备库抑制海水入侵提供借鉴。

    Underground oil reserves are established near the sea, which can reduce the cost of oil transportation and have strong military significance. However, the proximity to the coastline makes it easy for seawater to intrude into the reservoir area, resulting in corrosion of the metal structure in the reservoir area, thus reducing the service life of the reservoir. A simulation study on the risk of seawater intrusion was carried out with an offshore underground oil reserve project as the background. A refined three dimensional hydrogeological model with 15 geological structures such as integrated faults, jointed dense zones and water conduction channels was constructed, and the groundwater seepage field and solute transport field in the reservoir area under the natural state and during the operation period were studied. The study shows that (1) there is no seawater intrusion in the undergroundoilreserve in the natural state. (2) During the operation period, a horizontal water curtain with a distance of 10 m and a diameter of 0.11 m was only set at 25 m above the top of the cavern reservoir, exceeding the cave by 50 m around, which could not effectively prevent seawater intrusion. (3) When the cave reservoir was running for 9 a, the Cl− mole concentration on the southeast side of 3# cavern room exceeded 7 mol/m3, and seawater began to invade the cavern group; when it was running for 22 a to 23 a, the seawater invasion speed was the fastest; when it was running for 41 a, the Cl− mole concentration on the southeast side of 3# cavern room exceeded 143 mol/m3, and the seawater invasion reached the strong corrosion degree of steel; when it was running for 50 a, all the cavern rooms except 1# cavern room were invaded by seawater, 3# and 4# cavity rooms have some areas to reach strong corrosion degree, seawater invasion is the most serious. It is suggested to set up additional facilities such as vertical water curtain to enhance the prevention and control of seawater intrusion. The research results can provide reference for the suppression of seawater intrusion in underground oil reserves in offshore areas.

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  • 图 1  库区断层及节理密集带分布图

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  库区三维水文地质模型

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  断层及节理密集带有限元网格

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  洞室周围水平水幕系统布置示意图

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    图 5  降水分区示意图

    Figure 5. 

    下载: 全尺寸图片 幻灯片

    图 6  自然状态库区地下水位等值线与实测水位对比图

    Figure 6. 

    下载: 全尺寸图片 幻灯片

    图 7  洞室自然状态Cl−物质的量浓度等值线

    Figure 7. 

    下载: 全尺寸图片 幻灯片

    图 8  运行期地下水位等值线

    Figure 8. 

    下载: 全尺寸图片 幻灯片

    图 9  洞库运行50 a洞室顶部和底部及周边岩体Cl−物质的量浓度

    Figure 9. 

    下载: 全尺寸图片 幻灯片

    图 10  海水入侵前后时期洞室底部及周围岩体的Cl−物质的量浓度

    Figure 10. 

    下载: 全尺寸图片 幻灯片

    图 11  运行期3#洞室O点50 a Cl−物质的量浓度

    Figure 11. 

    下载: 全尺寸图片 幻灯片

    表 1  渗流场和溶质运移场各材料参数

    Table 1.  Parameters of each material in the percolation and solute transport fields

    材料 渗透系数
    /（m·s−1）    		 孔隙率
    /%    		 分子扩散系数
    /（m2·s−1）    		 纵向弥
    散度/m    		 横向弥
    散度/m
    断层 8.54E-7 10.0 2E-7 2 0.5
    节理密集带 1.00E-7 10.0 2E-7 2 0.5
    碎石节理带 1.00E-7 15.0 2E-7 2 0.5
    碎石土 8.54E-7 15.0 2E-7 2 0.5
    强风化二长花岗岩 8.54E-7 12.0 2E-7 2 0.5
    强风化片麻状花岗岩 5.00E-7 12.0 2E-7 2 0.5
    强风化辉长岩 5.00E-7 12.0 2E-7 2 0.5
    中风化二长花岗岩 4.00E-7 2.0 2E-8 1 0.1
    中风化片麻状花岗岩 1.00E-7 2.0 2E-8 1 0.1
    中风化辉长岩 1.00E-7 2.0 2E-8 1 0.1
    微风化二长花岗岩 9.00E-8 0.2 2E-8 1 0.1
    微风化片麻状花岗岩 8.50E-9 0.2 2E-8 1 0.1
    微风化辉长岩 8.50E-9 0.2 2E-8 1 0.1
    大陆架 1.00E-8 5.0 2E-8 1 0.1
    导水通道 2.00E-6 10.0 2E-7 50 1.0
    下载: 导出CSV

    表 2  钢筋腐蚀等级表[29]

    Table 2.  Steel corrosion grade table[29]

    腐蚀等级微腐蚀弱腐蚀中度腐蚀强腐蚀
    Cl−物质的量浓度/（mol·m−3）（0,3]（3,14.3]（14.3,143]（143, +∞）
    下载: 导出CSV
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收稿日期:  2022-12-03
修回日期:  2023-03-01
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