Changes

==Clay smear calculation==

==Clay smear calculation==

Clay smear is clay that is found in the fault segment and is one of the inhibiting factors for hydrocarbon migration. However, according to Yielding, et al, (1997) there are factors that determine the formation of clay smears, namely:

Clay smear is clay that is found in the fault segment and is one of the inhibiting factors for hydrocarbon migration. However, according to Yielding et al.<ref name=Yieldingetal_1997 /> there are factors that determine the formation of clay smears, namely:

* Thick coated claystone will result in a thicker clay spread.

* Thick coated claystone will result in a thicker clay spread.

* Shale Smear Factor (SSF) or clay smear factor is how far the vertical displacement is to the thickness of the claystone that is cut by the fault, and SSF does not become a seal if it is > 7. SSF is considered effective when applied to a simple single fault plane (not multiple fault planes) and only one clay layer is enlarged<ref name=Fossen_2010>Fossen, H., 2010, Structural Geology: Cambridge University Press, Cambridge, 463 p.</ref>.  

* Shale Smear Factor (SSF) or clay smear factor is how far the vertical displacement is to the thickness of the claystone that is cut by the fault, and SSF does not become a seal if it is > 7. SSF is considered effective when applied to a simple single fault plane (not multiple fault planes) and only one clay layer is enlarged<ref name=Fossen_2010>Fossen, H., 2010, Structural Geology: Cambridge University Press, Cambridge, 463 p.</ref>.  

 

::<math>\text{SSF} =  \frac{\text{Fault Offset}}{\text{Thickness of clay layer}}</math>

SSF =  (Fault Offset)/(Thickness of clay layer                 (3.1)

* Shale Gouge Ratio (SGR) or the ratio of crushed clay is the percentage thickness of the clay layer that is in the fault segment to the vertical displacement (throw). The higher the SGR value, the more potential it becomes a barrier.

* Shale Gouge Ratio (SGR) or the ratio of crushed clay is the percentage thickness of the clay layer that is in the fault segment to the vertical displacement (throw). The higher the SGR value, the more potential it becomes a barrier.

 

::<math>\text{SGR} = \Sigma \frac{\text{Thickness of clay layer}}{\text{fault throw}}</math>

SGR = Σ Thickness of clay layer/fault throw                   (3.2)

* Clay Smear Potential (CSP) is the amount of clay present in the fault segment which is given to each layer of clay that is cut by the fault. The more the CSP value, the further the displacement is indicated.

* Clay Smear Potential (CSP) is the amount of clay present in the fault segment which is given to each layer of clay that is cut by the fault. The more the CSP value, the further the displacement is indicated.

 

::<math>\text{CSP} =   \Sigma \frac{\text{Thickness of clay layer}^2}{\text{Distance to clay layer}}</math>

CSP = Σ Thickness of clay layer²/Distance to clay layer     (3.3)

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