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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 ...
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View a machine-translated version of the Spanish article. Machine translation, like DeepL or Google Translate , is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Johnson's new chart of national emblems. Print showing the flags of various countries, those flown by ships, and the "Signals for Pilots." In the top left corner is the "United States" 37-star flag, in the top right corner is the "Royal Standard of the United Kingdom Great Britain & Ireland"; in the bottom left corner is the "Russian Standard ...
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.
Naval jack of Spain. This is a list of active Spanish Navy ships, complete and correct as of December 2016, partially updated to January 2024. [1] [2]There are approximately 139 vessels in the Navy, including minor auxiliary vessels.