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диаграмма каротажа потенциалов самопроизвольной поляризации stresses
O&G	self-potential curve (MichaelBurov)
O&G, oilfield.	spontaneous polarization log; spontaneous SP log
O&G, sakh.	SP log; spontaneous potential log (measurement of natural potential differences between an electrode in a borehole and an electrode at the surface)
tech.	spontaneous potential log