Changes

==Porosity==

==Porosity==

Each of the porosity tools—density, compensated neutron, sonic, and photoelectrical effect—can be used to estimate porosity when lithology and fluid properties are known. (Methods for estimating porosity from these devices individually are described in [[Standard interpretation]].) When both porosity and lithology are unknown, two or more of the devices can be used together to determine both porosity and lithology. (The most common methods for determining both porosity and lithology are described in [[Lithology from Logs]].) Table 4 shows the resolution and applications of porosity devices.

Each of the porosity tools—density, compensated neutron, sonic, and photoelectrical effect—can be used to estimate porosity when lithology and fluid properties are known. (Methods for estimating porosity from these devices individually are described in [[Standard interpretation]].) When both porosity and lithology are unknown, two or more of the devices can be used together to determine both porosity and lithology. (The most common methods for determining both porosity and lithology are described in [[Quick-look lithology from logs]].) Table 4 shows the resolution and applications of porosity devices.

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