self-potential sonde (spontaneous potential sonde, SP sonde) A well-logging instrumental package that measures the electrochemical activity of the rocks within a borehole. Formations yielding a high and true SP log response include clay-rich sediments and sulphide minerals. The SP method cannot be used for logging wells in offshore areas, where saltwater-based drilling muds are used.
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Potential Instability , Skip to main content potential instability Reduction Potential , Skip to main content reduction potential Chemical potential , chemical potential See WATER POTENTIAL. chemical potential See water potential. Biotic Potential , biotic potential (intrinsic rate of natural increase) The maximum reproductive potential of an organism, symbolized by the letter r. The difference b… Pressure Potential , Skip to main content pressure potential Voltmeter , voltmeter Instrument for measuring the voltage (potential difference) between two points in an electrical circuit. Voltmeters are always connected in…
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