Numerical Simulation of Oscillating Pore Pressure Experiments and Inversion for Permeability
Numerical Simulation of Oscillating Pore Pressure Experiments and Inversion for Permeability
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振荡孔隙压力实验数值模拟及渗透率反演
作者：
A. Hasanov;B. Dugan;M. Batzle
渗透率的准确知识对于地下水、石油资源和地下污染物修复的成功管理至关重要。振荡孔隙压力法是一种常用的多孔岩石样品渗透率测量方法。我们开发了一种新的数据处理方法，利用广泛的多频率范围的数据，并对其进行渗透率反演。我们重新处理了已发布的数据，并证明我们的方法优于传统的数据简化技术，因为我们的反演结果更适合压力趋势。为了更好地理解频率对相位和振幅数据的影响，并验证我们的反演方法，我们数值模拟了四个岩石样品的振荡孔隙压力实验。我们记录了从0.3 Hz振荡频率开始实验获得的相位数据的强烈偏差。这种偏差的一个可能解释是压力扩散过程中的孔弹性耦合。该方法可用于渗透率的鲁棒性测定和数值模拟实验结果的快速预测，最终提高实验渗透率测量的分析水平。
Accurate knowledge of permeability is crucial for successful management of groundwater, petroleum resources, and subsurface contaminant remediation. The oscillating pore pressure method is a popular laboratory technique for permeability measurements of porous rock samples. We develop a novel data processing approach that utilizes a broad, multifrequency range of data and inverts it for permeability. We reprocess published data and demonstrate that our methodology outperforms traditional data reduction techniques, as our inversion results show a better fit to pressure trends. To better understand the effect of frequency on phase and amplitude data and to verify our inversion approach, we numerically simulate oscillating pore pressure experiments for four rock samples. We document a strong deviation of experimentally obtained phase data starting at 0.3 Hz oscillation frequency. A possible explanation for this deviation is poroelastic coupling during pressure diffusion. Our method can be used for robust determination of permeability and rapid prediction of experimental results using numerical simulation, ultimately improving the analysis of experimental permeability measurements.