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Quantitative fault seal analysis (view source)
Revision as of 22:11, 18 February 2014
, 22:11, 18 February 2014→Determine SGR threshold
==Determine SGR threshold==
==Determine SGR threshold==
[[file:evaluating-top-and-fault-seal_fig10-25.png|thumb|{{figure number|4}}See text for explanation.]]
The SGR threshold for a basin is defined by determining the SGR for known sealing and leaking faults in producing fields. The empirical threshold can then be used to assess prospects and plays and well as develop fields. SGR thresholds vary among basins.
The SGR threshold for a basin is defined by determining the SGR for known sealing and leaking faults in producing fields. The empirical threshold can then be used to assess prospects and plays and well as develop fields. SGR thresholds vary among basins.
The following example of an SGR threshold plot for the U.S. Gulf Coast directly assigns fault seal risk based upon the variation in SGR and seal behavior observed in a data set of approximately 160 faults. The plot shows the percent of faults cross sealing for oil as a function of changing SGR. The actual SGR values have been deleted intentionally.
The example in [[:file:evaluating-top-and-fault-seal_fig10-25.png|Figure 4]] of an SGR threshold plot for the U.S. Gulf Coast directly assigns fault seal risk based upon the variation in SGR and seal behavior observed in a data set of approximately 160 faults. The plot shows the percent of faults cross sealing for oil as a function of changing SGR. The actual SGR values have been deleted intentionally.
Above a specific SGR value, 100% of all faults in the Gulf Coast cross-leak oil. Below a specific SGR value, 100% of the faults cross-seal oil. A narrow transition zone defines the threshold for seal/leak. Separate thresholds exist for cross-seal/-leak, dip-seal/-leak, oil, and gas.
Above a specific SGR value, 100% of all faults in the Gulf Coast cross-leak oil. Below a specific SGR value, 100% of the faults cross-seal oil. A narrow transition zone defines the threshold for seal/leak. Separate thresholds exist for cross-seal/-leak, dip-seal/-leak, oil, and gas.
==See also==
==See also==