MEASUREMENT OF PERMEABILITY OF TIGHT ROCKS

An improved method for simultaneously determining the permeability k a nd porosity rp of tight rock samples (k < 10(-4) mu m(2)) using unstea dy state liquid flow through porous media (pulse technique) has been d eveloped. This method uses a history matching routine based on the met hod of variation of parameters for matching experimental data with sim ulated data (data generated by the computer program). A relationship b etween porosity and permeability has been developed which does not req uire initial guesses for porosity and permeability to run the iteratio n procedure. This method was applied to determine the permeability of three tight rocks at different confining pressures and the results are presented.