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[[File:Shale-gouge-ratio-fig3.png|thumb|300px|{{figure number|3}}Gouge ratio algorithms for estimating likelihood of clay entrainment in the fault gouge zone. The gouge ratio reflects the proportion of the sealing lithology in the rock interval that has slipped past a given point on the fault. (a) Calculation for explicit shale/clay beds in an otherwise shale-free sequence; Dz is the thickness of each shale bed. (b) Calculation for a sequence of reservoir zones; Dz is the thickness of each reservoir zone and Vcl is the clay volume fraction in the zone.]]

[[File:Shale-gouge-ratio-fig3.png|thumb|300px|{{figure number|3}}Gouge ratio algorithms for estimating likelihood of clay entrainment in the fault gouge zone. The gouge ratio reflects the proportion of the sealing lithology in the rock interval that has slipped past a given point on the fault. (a) Calculation for explicit shale/clay beds in an otherwise shale-free sequence; Dz is the thickness of each shale bed. (b) Calculation for a sequence of reservoir zones; Dz is the thickness of each reservoir zone and Vcl is the clay volume fraction in the zone.]]

The shale gouge ratio is simply the percentage of shale or [[clay]] in the slipped interval. [[:File:Shale-gouge-ratio-fig3.png|Figure 3a]] illustrates how this would be calculated, at a given point on a fault surface, for explicit shale beds (Equation 4):

The [[shale gouge ratio]] is simply the percentage of shale or [[clay]] in the slipped interval. [[:File:Shale-gouge-ratio-fig3.png|Figure 3a]] illustrates how this would be calculated, at a given point on a fault surface, for explicit shale beds (Equation 4):

<math>\text{SGR} = \frac{\Sigma (\text{shale bed thickness})}{\text{fault throw}} \times 100%</math>

<math>\text{SGR} = \frac{\Sigma (\text{shale bed thickness})}{\text{fault throw}} \times 100%</math>