Smear-gouge ratio
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Smear-gouge ratio is the ratio of sand to shale that has moved past some critical portion of the fault plane (Skerlec, 1996). Although not simply relatable to the shale gouge ratio, the smear gouge ratio varies in an inverse manner; i.e., high shale gouge ratio corresponds to low smear gouge ratio and vice versa.
Both ratios are commonly called SGR.
http://archives.datapages.com/data/bulletns/1997/06jun/0897/0897.htm?q=%2BauthorStrip%3Ayielding
Skerlec, G. M., 1996, Risking fault seal in the Gulf Coast (abs.): AAPG Annual Convention Program and Abstracts, v. 5,
p. A131.