10,323
edits
Changes
Jump to navigation
Jump to search
Line 47:
Line 47: − + − + − + − +
Quantitative fault seal analysis (view source)
Revision as of 15:17, 2 September 2014
, 15:17, 2 September 2014→Step 2: Calculate the SGR
==Step 2: Calculate the SGR==
==Step 2: Calculate the SGR==
<gallery mode=packed heights=200px widths=200px>
<gallery mode=packed heights=200px widths=200px>
file:evaluating-top-and-fault-seal_fig10-22.png|{{figure number|1}}See text for explanation.
file:evaluating-top-and-fault-seal_fig10-22.png|{{figure number|1}}Example of an SGR calculation for a portion of a fault at progressive throws of 50, 100, and 200 ft. Sands are patterned; shales are black. The black trace is an SP log.
file:evaluating-top-and-fault-seal_fig10-23.png|{{figure number|2}}See text for explanation.
file:evaluating-top-and-fault-seal_fig10-23.png|{{figure number|2}}A plot of SGR vs. throw, taken from the preceding example.
file:evaluating-top-and-fault-seal_fig10-24.jpg|{{figure number|3}}See text for explanation.
file:evaluating-top-and-fault-seal_fig10-24.jpg|{{figure number|3}}Variation in SGR for each point along the fault.
</gallery>
</gallery>
[[:file:evaluating-top-and-fault-seal_fig10-22.png|Figure 1]] is an example of an SGR calculation for a portion of a fault at progressive throws of 50, 100, and [[length::200 ft]]. Sands are patterned; shales are black. The black trace is an SP log.
[[:file:evaluating-top-and-fault-seal_fig10-22.png|Figure 1]] is an example of an SGR calculation for a portion of a fault at progressive throws of 50, 100, and 200 ft. Sands are patterned; shales are black. The black trace is an SP log.
The portion of the fault analyzed is adjacent to the R<sub>d</sub> sand in the hanging wall. The SGR is the ratio of the total sand divided by the total shale that has moved past the fault. The stratigraphy that has moved past this portion of the fault is marked in red. As the throw increases, more of the stratigraphy below the R<sub>u</sub> and R<sub>d</sub> sands moves past the fault and the SGR changes.
The portion of the fault analyzed is adjacent to the R<sub>d</sub> sand in the hanging wall. The SGR is the ratio of the total sand divided by the total shale that has moved past the fault. The stratigraphy that has moved past this portion of the fault is marked in red. As the throw increases, more of the stratigraphy below the R<sub>u</sub> and R<sub>d</sub> sands moves past the fault and the SGR changes.