la diffusion des rayonnement électromagnétique aux petits angles permet d'obtenir une courbe de distribution des pores, même s'ils sont fermés. Sinon les méthodes BET peuvent aussi être utilisées. CVoir les méthodes employées par les pédologues.

You might want to have a look here: http://www.ged.rwth-aachen.de/index.php?cat=Research&subcat=Nanoporosity&page=Nano_porosity_overview

There are several papers published and in press regarding this subject by the Aachen Group, including an evaluation on Woods Metal porosimetry in clays.

You can measure the bulk volume of the clay rocks and the real volume (volume of solid materials) the difference between them is the void volume. You can use water saturation technique for determination.

Water saturation technique is unacceptable if swelling clay minerals are present in the clay!

A solution for the clay-swelling effects could be the use of non-polar fluids like heptane or isooctane. Anyway, the mentioned Archimedes method is not appropriated for investigations on the pore size distribution in clay rocks.

Non-wetting phase/non adsorptive phase mercury and gas capillary injection measurements have been used in the past on shale samples to estimate pore size (actually pore throat) distribution. For example Hg, vs. N2, vs He injection methods.

Nano-CT can complement other techniques if available to you, but tight claystones are a field of their own. I would recommend looking for papers that discuss your available equipment at the Society for Core Analysis (it may have slightly different name?).

Thanks, will have o look at that.

You’re asking the question is good generally the clay was porous nature materials, but the pore size of the clay was place to place change but the distribution in clay rock method is GRI technique of measuring total porosity and the pore-size distribution (PSD).