POROSITY LOGGING

POROSITY LOGGINGThe POROSITY of a zone can be estimated either from a single POROSITY log (sonic, density , neutron, or magnetic resonance log) or a combination of porositylogs, in order to correct for variable lithology effects in complex reservoirs. In thecarbonates, mineral mixtures are primarily drawn from calcite, dolomite, andquartz (either as sand grains or as chert); anhydrite and gypsum may also using a single POROSITY log, the true POROSITY is calculated frominterpolation between the values for the matrix mineral and the pore fluid(usually equated with mud filtrate, because of the shallow investigation of theporosity tools). density log: POROSITY is calculated from the mass-balance relationship:where pb is the bulk density , 0 is the POROSITY , pma is the matrix density , and pfis the pore fluid density . If a sandstone, then the matrix density is gm/cc(quartz), if a limestone, the matrix density is gm/cc (calcite); if a dolomite,then the matrix density is about gm/cc.

porosity tools). Density log: Porosity is calculated from the mass-balance relationship: where pb is the bulk density, 0 is the porosity, pma is the matrix density, and pf is the pore fluid density. If a sandstone, then the matrix density is 2.65 gm/cc (quartz), if a limestone, the matrix density is 2.71 gm/cc (calcite); if a dolomite,

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  Bulk, Density, Porosity, Bulk density

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