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|June 12, 2012

Summary

This summary is machine-generated.

This study introduces a low-field nuclear magnetic resonance (NMR) tomography method for non-invasively imaging water content in large geological formations. The technique is effective for monitoring subsurface CO(2) storage and nuclear waste sites.

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Area of Science:

Geophysics
Nuclear Magnetic Resonance (NMR) Spectroscopy
Fluid Dynamics

Background:

Monitoring subsurface fluid flow is crucial for applications like carbon dioxide (CO(2)) sequestration and nuclear waste disposal.
Conventional methods face challenges in imaging water content within large, electrically conductive geological formations.

Purpose of the Study:

To develop and demonstrate a low-field NMR tomographic method for non-invasively imaging water distribution in large-scale (∼1 m(3)) experiments.
To enable remote monitoring of subsurface processes in electrically conductive environments.

Main Methods:

Utilized low-field NMR with pre-polarization to enhance signal strength in Earth's magnetic field.
Employed spatially dependent field inhomogeneities from surface coils for signal localization, avoiding complex magnetic field gradients.
Implemented a setup with four surface coils and three volume coils around a large sample volume.

Main Results:

Successfully demonstrated the method's feasibility in a simulated CO(2) injection experiment.
Located and quantified the reduction in water content after gas injection in a large cylindrical sample.
Achieved a spatial resolution of approximately 10 cm.

Conclusions:

The proposed low-field NMR tomography offers a mobile, cost-effective solution for non-invasive imaging of water content in large geological formations.
This method provides a more direct estimation of fluid content compared to acoustic or electromagnetic techniques.
The technology is highly relevant for geophysical applications, including monitoring CO(2) injection sites and detecting water leakage in nuclear waste repositories.