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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. The log works by measuring small electric potentials (measured in millivolts) between depths with in the borehole and a grounded electrode at the surface.
As established earlier, static SP is defined as follow: SSP = −K log (R mfe /R we) Static SP (SSP) can be obtained directly from the SP curve if the bed is clean, thick, porous, permeable, and only moderately invaded. When these conditions are not met, the recorded SP will need to be corrected. Various correction charts are available for this ...
The SP log, known variously as a "Spontaneous Potential", "Self Potential" or "Shale Potential" log is a voltmeter measurement of the voltage or electrical potential difference between the mud in the hole at a particular depth and a copper ground stake driven into the surface of the earth a short distance from the borehole.
The Nasdaq fell 3% at Monday's open, and the S&P 500 fell half that. But as our Chart of the Week shows, the market returned — almost exactly — to where it was last Friday. ... you might log ...
A linear chart of the S&P 500 daily closing values from January 3, 1950, to February 19, 2016 A logarithmic chart of the S&P 500 index daily closing values from January 3, 1950, to February 19, 2016 A daily volume chart of the S&P 500 index from January 3, 1950, to February 19, 2016 Logarithmic Chart of S&P 500 Index with and without Inflation and with Best Fit and other graphs to Feb 2024
The upper cluster has two roughly parallel curvy plots using S&P 500 Monthly $ MAXIMUM values for the upper line and $ MINIMUM values for the lower line 1/1950 to latest on chart. The upper cluster has 2 straight lines a Best Fit Upper, and Best Fit Lower, which in effect represent one line with thickness or separation, value see chart legend.
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