spontaneous-potential well logging
spontaneous-potential well logging[spän′tā·nē·əs pə′ten·chəl ¦wel ‚läg·iŋ]
The recording of the natural electrochemical and electrokinetic potential between two electrodes, one above the other, lowered into a drill hole; used to detect permeable beds and their boundaries. Also known as SP logging.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.