sour dirt

sour dirt

[′sau̇r ¦dərt]
(petroleum engineering)
Sulfate-impregnated soil or soil characterized by escaping sulfur dioxide or hydrogen sulfide; considered an indicator of oil in the area. Also known as copper dirt.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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