Pore analysis

A pore analysis method comprising the steps of:

• generating a model of a medium, the model comprising a regular array of pores, the pores being connected to adjacent ones of the pores by throats;
• modifying the sizes of the pores and throats until the model of the medium is representative of the medium;
• simulating, using the model, the effect of percolation of the medium using a fluid at a first pressure;
• repeating the simulation step with progressively increasing intrusion pressures and noting, for each pore, the intrusion pressure at which intrusion of that pore occurs;
• and
• identifying, from the information relating to the intrusion pressure at which intrusion of each pore occurs, at least one pore that should be treated, during further analysis, as comprising a cluster of voids,
• wherein the pores identified as comprising clusters of voids are identified by determining a cluster ratio value for each pore, m, for which a distribution of pore sizes of the model does not have a spike or discontinuity at a maximum pore size of the distribution of pore sizes, the cluster ratio being defined as:
• Cr=Pintr,m/Psize,m
• wherein Pintr,m is the simulated intrusion pressure of each pore, m, and Psize,m is an expected size intrusion pressure of each pore, m.