1887

Abstract

The prediction of hydraulic conductivity (K) from NMR measurements (Phi, T2) can be applied successfully on sandstones. For hydrological applications in the near surface unconsolidated material is more common. This material generally shows less variability in porosities but a larger range of pore sizes compared to sandstones. The known (semi-)empiric K-T2 relations have often be extended to this field of application but their validity needs to be verified. In this work we present a simple model based on tube pores, which is valid for the whole range of laminar flow from silt to gravel. By considering the slow diffusion regime we are able to estimate a maximum K from a measured T2 time. The model replaces the empiric factors in known K-T2 relations with (petro-)physical parameters. This enables to separate effects caused by variations of the surface relaxivity, a material characteristic that links T2 to the inner surface of the material, from variations of other parameters. This may help to reduce the range of the predicted K-values from NMR measurement on similar materials and enable to incorporate results from ofter methods.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20144437
2011-09-12
2024-03-29
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20144437
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error