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24 de jun. de 2015 · If the currents could be interrupted by hypothetical insulating plugs (see the upper part of Fig. 1), the potential observed in the mud would be the total spontaneous potential. This idealized SP deflection is called the static SP (or SSP).
Spontaneous potential log, commonly called the self potential log or SP log, is a passive measurement taken by oil industry well loggers to characterise rock formation properties.
Spontaneous potentials (SP) are usually caused by charge separation in clay or other minerals, due to presence of semi-permeable interface impeding the diffusion of ions through the pore space of rocks, or by natural flow of a conducting fluid through the rocks.
24 de jun. de 2015 · Most wireline resistivity-logging tools also have the ability to measure and record small differences in electrical potential that occur spontaneously in conductive muds as a continuous SP curve.
28 de jul. de 2016 · The spontaneous potential (SP) log was developed next and was presented along with resistivity logs. It is a measurement of the voltage difference between a movable electrode in the wellbore and a fixed electrode at the surface.
7 de sept. de 2018 · SP log is one of the first tools used for formation evaluation. It measures the difference in potential or DC voltage between two points. One point is the electrode on the surface. Second point is the electrode taken downhole by wireline (Fig.1.)
The SP log is a record of direct current (DC) voltage (or potential) that develops naturally (or spontaneously) between a moveable electrode in the well bore and a fixed electrode located at the surface (Doll, 1948). It is measured in millivolts (mV).
