Identification of Hydrogeological Parameter in Double-Porosity Fractured Aquifer Based on Single-Well Pumping Test
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摘要: 为探究双重介质含水层中单孔抽水试验水文地质参数求取方法，在不考虑井储效应的双重介质非达西流模型基础上，提出了考虑井储效应的双重介质非达西流模型，并以某野外试验场中实地进行的单孔抽水试验为例，比较了不同求参方法对单孔抽水试验参数识别的效果.结果表明，使用考虑井储的双重介质非达西流模型，反演结果与实测水位降深的吻合度最高；考虑非达西流态，更加适用于抽水流量大，地下水流场呈现非达西流的状态；考虑井储效应，能够更好地刻画出抽水过程前期地下水位迅速下降的现象；考虑双重介质结构，能够更好地刻画出抽水过程前‒中期孔隙‒裂隙介质间水量交换作用由弱变强的现象.说明本文提出的考虑井储效应的双重介质非达西流模型具有一定的适用性.Abstract: To find out a suitable equation for single-well pumping test in double-porosity aquifer, it takes wellbore storage effect into consideration and present the double-porosity non-Darian model with wellbore storage effect based on double-porosity non-Darcian model in this study. Taking a single-well pumping test as an example, the results show that the simulation curve has the highest accuracy when using the double-porosity non-Darcian model proposed in this study; taking non-Dacian effect into consideration is more suitable when the pumping rate is relatively large and the flow in aquifer shows non-Darcian property. When considering non-Darcian effect, we can have a better inversion of the instantaneous drawdown in early time; when regarding the aquifer as double-porosity, we can portray the weak to strong process of the water exchange in fracture and porosity media. In that case, the double-porosity non-Darcian model with wellbore storage effect presented in this study is suitable for single-well pumping test in double-porosity aquifer.
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图 1 不同模型水位降深s-抽水时间t曲线
Fig. 1. Drawdown-time curve of observation well using different models
图 6 不同模型对单孔抽水试验的拟合结果
Fig. 6. Curve-fit graph of single-well pumping test using different models
表 1 抽水孔代表性岩心及含水层划分
Table 1. Representative lithology and aquifer division of the hydrogeology in pumping well
岩性分层 层深（m） 地层岩性 岩心照片 含水层划分 1 0~39.5 J3ch1b凝灰岩 
风化裂隙水，水量小 风化裂隙含水层 2 39.5~306 J3ch1b凝灰岩 
相对隔水层 3 306~320 J3ch1b凝灰岩 
断层破碎带，涌水段 承压含水层 4 320~520 J3ch1b凝灰岩 
相对隔水层 
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表 2 不同模型对单孔抽水试验的拟合结果
Table 2. Curve fit results of single-well pumping test using different models
拟合结果 选用模型 考虑井储效应 不考虑井储效应 双重介质非达西流 双重介质达西流 均质含水层非达西流（Wen模型） 双重介质非达西流（Wang模型） Theis模型 n 1.117 1 1.248 1.098 1 Kq（m/s）n 7.207×10‒6 2.37×10‒5 2.35×10‒6 9.32×10‒6 2.28×10‒5 Sf（-）f 0.049 92 0.022 53 - 0.023 75 - Sm（-） 0.478 3 0.225 5 0.239 8 0.237 5 0.489 C（s‒1） 16.02 11.95 - 2.44 - RMSE 0.194 7 0.214 9 0.329 2 0.242 9 0.303 8
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