Abstract: The conventional methods of coring, wash oil and dry sample for making cast thin section from clay sandstone enriched with smectite tend to shape artificial fractures, hence should not reflect the real porosity in it. This paper presents a new method for making such a cast thin section that can be of fidelity by avoiding the artificial porosity and fractures of such a sample due to dehydration and shrinkage.

Key words: smectite, thin section, porosity, method