Some articles on total porosity, porosity:
... form the grain volume, with all other components constituting core analysis “total porosity” (notwithstanding comments in (6) below) ... This core total porosity will generally be equivalent to the total porosity derived from the density log when representative values for matrix and fluid density are used ... space, then neutron logs will overestimate porosity in argillaceous rocks by sensing OH− as part of the pore space ...
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