And, an increase in a porosity log might indicate that the formation has porosity and is permeable.Ĥ POROSITY LOG TYPES 3 Main Log Types Bulk density Sonic (acoustic)Ĭompensated neutron These logs do not measures porosity directly. An increase in resistivity may indicate the presence of hydrocarbons. For example, a decrease in radioactivity from the gamma ray log could indicate the presence of a sandstone formation. Gamma ray Resisitivity Porosity Increasing radioactivity resistivity porosity Shale Oil sand An engineer or geologist can interpret the log readings to reach certain conclusions about the formation. The information is processed by a computer in the logging vehicle, and is interpreted by an engineer or geologist.
The logging tools measure different properties, such as spontaneous potential and formation resistivity, as the sonde is brought to the surface.
A wireline truck with a spool of logging cable is setup so that the sonde (measuring equipment) can be lowered into the wellbore. Well Log SP Resistivity This figure depicts the basic setup of the logging process.
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