A Study on hydropulse tomography in multiphase condition in underground

为了估算地下多相条件下的三维非均质水力特性，开发了基于拟牛顿法和两相最优控制方法的数值反演程序；为了评价水力脉冲层析成像估算水力参数的可靠性，开发了压力变化率匹配的高效单相反演数值算法，并计算了程序估算的水力特性的可信区间。通过分析研究，提出了两相数值反演的压力变化率匹配算法，并进行了干砂岩和湿砂岩的室内空气脉冲试验，验证了两相反演法对压力匹配的有效性，并利用自由水区水波脉冲试验的现场压力数据验证了该程序的适用性，并将两相反演结果与单相反演结果进行了比较。

In order to estimate three dimensional heterogeneous hydraulic properties in multiphase condition in underground, numerical inversion code based on quasi-Newton method and optimal control method for two-phase condition has been developed.To evaluate the reliability on hydraulic parameters estimated by hydropulse tomography, highly efficient numerical algorithm with pressure change rate matching for single-phase inversion has been developed, and confidence intervals of hydraulic properties estimated by the code has been calculated. 'And, by analytical study, pressure change rate matching algorithm for two-phase numerical inversion has been found out to be possible to construct.Laboratory air pulse test for a dry sandstone and a wet sandstone has been carried out, and two-phase inversion method is proved to be useful for pressure matching. Also field pressure data of hydropulse test in free water zone has been used to see the applicability of the code, and two-phase inversion result has compared to single-phase inversion result.