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Line 22: − {| class = "wikitable"+ − |-+ − ! Step+ − ! Action+ − |-+ − | 1+ − | Gather all available fluid data regarding production, shows, and pressures from prospective intervals.+ − |-+ − | 2+ − | On structural [[cross section]]s, plot intervals that …+ − + − + − + − + − + − + − |-+ − | 3+ − | Divide potential reservoir units on the cross sections into intervals of similar petrophysical character (flow units) using log data and, if available, porosity-[[permeability]] data. Categorize each flow unit by port type as mega-, macro-, meso-, or microporous. − |- − | 4 − | Calculate water saturation (S<sub>w</sub> ) of intervals that … − − − − − − |- − | 5 − | Estimate the height above free water for zones that appear to have oil or gas. − |- − | 6 − | Analyze the fluid data in the context of the petrophysical data. − − − |- − | 7 − | Determine whether a relationship exists between the development of reservoir-quality rocks, seal-quality rocks, and lithofacies that can be used to predict location and economic viability of prospective traps. − |}
Petrophysical analysis of lithofacies (view source)
Revision as of 20:45, 23 December 2014
, 20:45, 23 December 2014→Procedure
After lithofacies analysis, a careful petrophysical analysis of shows and production should be made and compared to lithofacies distribution. The table below suggests a procedure for petrophysical analysis.
After lithofacies analysis, a careful petrophysical analysis of shows and production should be made and compared to lithofacies distribution. The table below suggests a procedure for petrophysical analysis.
# Gather all available fluid data regarding production, shows, and pressures from prospective intervals.
# On structural [[cross section]]s, plot intervals that …
#* Were perforated
#* Had DSTs
#* Had RSTs
#* Had mud log shows
## Annotate the intervals with the results.
# Divide potential reservoir units on the cross sections into intervals of similar petrophysical character (flow units) using log data and, if available, porosity-[[permeability]] data. Categorize each flow unit by port type as mega-, macro-, meso-, or microporous.
# Calculate water saturation (S<sub>w</sub> ) of intervals that …
#* Are productive
* Were perforated
#* Had shows
* Had DSTs
#* Are potential reservoirs
* Had RSTs
## Annotate the log intervals with S<sub>w</sub> values.
* Had mud log shows
# Estimate the height above free water for zones that appear to have oil or gas.
# Analyze the fluid data in the context of the petrophysical data.
Annotate the intervals with the results.
#* Do S<sub>w</sub> values, shows, and fluid pressures make sense in context with other geological data, including hydrocarbon column height?
#* Do the shows or S<sub>w</sub> values indicate the presence of an updip or downdip trap?
# Determine whether a relationship exists between the development of reservoir-quality rocks, seal-quality rocks, and lithofacies that can be used to predict location and economic viability of prospective traps.
* Are productive
* Had shows
* Are potential reservoirs
Annotate the log intervals with S<sub>w</sub> values.
* Do S<sub>w</sub> values, shows, and fluid pressures make sense in context with other geological data, including hydrocarbon column height?
* Do the shows or S<sub>w</sub> values indicate the presence of an updip or downdip trap?
==Example: calibrating logs to cores and shows==
==Example: calibrating logs to cores and shows==