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Three-dimensional geostatistical inversion of flowmeter and pumping test data.

Wei Li¹, Andreas Englert, Olaf A Cirpka

¹Swiss Federal Institute of Aquatic Science and Technology (Eawag), Uberlandstrasse 133, 8600 Dübendorf, Switzerland.

|February 13, 2008

Summary

This study introduces a geostatistical method to estimate hydraulic conductivity by jointly inverting flowmeter and pumping test data. The approach improves the three-dimensional (3D) subsurface conductivity structure compared to using pumping tests alone.

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Area of Science:

Hydrogeology
Geostatistics
Environmental Science

Background:

Accurate estimation of hydraulic conductivity is crucial for groundwater flow and contaminant transport modeling.
Traditional methods often rely on limited data or require extensive pre-processing.
Integrating diverse field data sources can enhance subsurface characterization.

Purpose of the Study:

To develop and apply a joint geostatistical inversion method for estimating 3D hydraulic conductivity.
To leverage flowmeter and pumping test data synergistically.
To improve the resolution and accuracy of subsurface hydraulic conductivity models.

Main Methods:

Joint inversion of steady-state pumping test drawdowns and flowmeter discharge profiles.
Geostatistical analysis to integrate vertical and horizontal conductivity information.
Application to field data from the Krauthausen test site.

Main Results:

The joint inversion successfully estimated hydraulic conductivity without needing depth-averaged measurements.
Flowmeter data provided relative vertical conductivity distributions.
Pumping test data informed horizontal variations in depth-averaged conductivity.
The resulting 3D geostatistical model showed improved structural detail compared to inversions using only pumping test data.

Conclusions:

Joint inversion of flowmeter and pumping test data is an effective method for characterizing 3D hydraulic conductivity.
This integrated approach enhances the understanding of subsurface heterogeneity.
The method offers a more comprehensive subsurface characterization for hydrogeological studies.