Interparticle pore network

The positronium annihilation lifetime spectroscopy was successfiilly applied to the study of pore structure of the as-synthesized sample of MCM-41. The PALS technique can supply information about imperfections in the template structure as well as silica walls of MCM-41. The interior of cylindrical micelles encaged in the silica skeleton exhibits the presence of some kind of defects which disappear when pressure of argon increases. Howeva-, small voids present in the walls of silica network are resistant to compression and their dimensions are independent of pressure. Under mechanical pressure one can observe total destruction of interparticle pores at about 140 MPa. However, small voids in the sample are present up to 450 MPa. Temperature treatment leads to quite different effects than those observed for pressure experiment. 

The complex pore system of carbonate reservoirs ranges from microcrys-talline pores to large vugs or caverns. The petrophysical characteristics are controlled by connected networks of interparticle pores (matrix), vuggy pore space, and fracmres, where ... 

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