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Petroleum Geology Acronyms

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Resistivity Phase Diff Compensated Apparent Long 400kHz (RPAL)

This is an abbreviation for a well log used in the oil and gas industry. You might have encountered this acronym RPAL in your log evaluation software or any (ASCII) log files provided by the logging company. The code stands for 'Resistivity Phase Diff Compensated Apparent Long 400kHz'. Usage of this log is not high and encountering it is a rare occasion.

Use this log to investigate the formation resistivity as measured by the phase shift of a high frequency electromagnetic wave (hundreds of KHz to several MHz, 1.1 GHz in the case of Schlumberger's EPT tool); these measurements are typically sharp (good vertical resolution) and have good dynamic range, but their depth of investigation is less than that of measurements based on attenuation. At a higher level, this can be seen as a measure of the electromagnetic propagation resistivity. This can be explained as being the formation resistivity as measured by the attenuation or phase shift of a high frequency electromagnetic wave; the frequency range for these measurements is higher than that of induction measurements, typically hundreds of KHz to several MHz, and over 1 GHz in the case of the Schlumberger EPT tool.

This log usually has the unit 'Resistivity'. This is the property of a material which resists the flow of electrical current. The ratio of electric-field intensity to current density. The reciprocal of conductivity.

Data for this log is produced by a tool that uses a electromagnetic logging technique and can be used to investigate the resistivity of the formation. Similar logs are listed below:

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