地震研究

为了研究不同井水位气压效率计算方法的原理及差异性,基于2019年2月1日至2020年7月28日云南高大井的气压与水位数据,使用Clark方法、Rahi方法、回归反卷积法和Acworth方法计算了该井的气压效率BE值,分别为:0.439 5、0.496 8、0.617 4和0.665 4,平均值为0.554 8。对比分析结果表明:Clark方法和Rahi方法的优点是计算简单方便,但是没有考虑时间滞后的影响; 回归反卷积法可以获得BE值随滞后时间的变化情况,但是极易受到降水、蒸散发等信号的影响; Acworth方法考虑了固体潮信号并且避免了降水、蒸散发等信号的干扰,但是该方法仅适用于承压和半承压含水层中。最后,根据4种方法的特点和适用性,对不同目的下的井水位气压效应分析给出了相应的建议。

On the basis of the data of barometric pressure and water level in Gaoda Well in Yunnan from February 1,2019 to July 28,2020,we calculated the well's barometric-efficiency values with the Clark method,the Rahi method,the regression deconvolution method,and the Acworth method,and compared the calculated values from these four methods,so as to study the principles and difference of these four methods.The barometric-efficiency values were 0.4395,0.4968,0.6174 and 0.6654 respectively,and the average is 0.5548.The calculation of the Clark method and the Rahi method is simple and convenient,but the effect of time lag is neglected by these two methods.The variation of the barometric-efficiency values with lag time can be obtained by the regression deconvolution method,but this method is highly susceptible to the influence of signals like precipitation and evapotranspiration.The Acworth method takes into account the earth tide signal and avoids the interference of precipitation and evapotranspiration signals,but it is only applicable to confined and semi-confined aquifers.Finally,according to the characteristics and applicability of the four methods,we proposed suggestions for the selection of different methods of calculating the barometric efficiency under different conditions.

引言
1 气压效应原理
2 观测井概况和数据收集
3 基于不同方法计算气压效率
4 气压效率结果对比
5 结论

图1 承压含水层井孔气压效应示意图<br/>Fig.1 Schematic diagram of the wellbore barometric pressure effect in the confined aquifer

图1 承压含水层井孔气压效应示意图
Fig.1 Schematic diagram of the wellbore barometric pressure effect in the confined aquifer

图2 高大井岩性及钻孔剖面示意图<br/>Fig.2 Lithology and wellbore structure of Gaoda Well

图2 高大井岩性及钻孔剖面示意图
Fig.2 Lithology and wellbore structure of Gaoda Well

图3 2019年2月—2020年7月高大井水位(a)和气压(b)时间序列图<br/>Fig.3 Time series of water level(a)and barometric pressure(b)in Gaoda Well from February 2019 to July 2020

图3 2019年2月—2020年7月高大井水位(a)和气压(b)时间序列图
Fig.3 Time series of water level(a)and barometric pressure(b)in Gaoda Well from February 2019 to July 2020

图4 高大井水位埋深与气压变化关系图<br/>Fig.4 The relationship between the depth of water table and the barometric pressure in Gaoda Well

图4 高大井水位埋深与气压变化关系图
Fig.4 The relationship between the depth of water table and the barometric pressure in Gaoda Well

图5 使用Clark方法(a)和Rahi方法(b)计算的高大井水位与气压变化量之和<br/>Fig.5 Sum of water level and barometric pressure variation of Gaoda Well by the Clark method(a)and the Rahi method(b)

图5 使用Clark方法(a)和Rahi方法(b)计算的高大井水位与气压变化量之和
Fig.5 Sum of water level and barometric pressure variation of Gaoda Well by the Clark method(a)and the Rahi method(b)

图6 高大井采样间隔为1 min的气压响应函数<br/>Fig.6 Barometric response function with 1-minute sampling interval for Gaoda Well

图6 高大井采样间隔为1 min的气压响应函数
Fig.6 Barometric response function with 1-minute sampling interval for Gaoda Well

表1 使用Acworth方法计算的高大井各个分量结果<br/>Tab.1 Calculated parameters of Gaoda Well by the Acworth method

表1 使用Acworth方法计算的高大井各个分量结果
Tab.1 Calculated parameters of Gaoda Well by the Acworth method

图7 高大井水位(a)、气压(b)和理论固体潮(c)的傅立叶频谱图<br/>Fig.7 Fourier spectra of water level(a),barometric pressure(b),and theoretical earth tide(c)in Gaoda Well

图7 高大井水位(a)、气压(b)和理论固体潮(c)的傅立叶频谱图
Fig.7 Fourier spectra of water level(a),barometric pressure(b),and theoretical earth tide(c)in Gaoda Well

表2 4种方法计算气压效率的结果<br/>Tab.2 Calculated barometric efficiency with the four methods

表2 4种方法计算气压效率的结果
Tab.2 Calculated barometric efficiency with the four methods

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备注

引言

1 气压效应原理

2 观测井概况和数据收集

3 基于不同方法计算气压效率

4 气压效率结果对比

5 结论

期刊信息