To globally create delta phi
curvesYou can create delta phi curves for all wells in a cross section. Delta_Phi equals neutron porosity less density porosity and is used to map gas effect in a cross section. If there is no density porosity curve, sonic porosity can be used as a second curve. If there is no density or sonic porosity curves, you can create them from RHOB or DT using the unique matrix DT or the matrix interval transit time. For details, click Globally Creating Density Porosity Curves.
To globally create delta phi
curves
1. From the Global menu, select Globally create Delta Phi curves.
The Selection
dialog box appears.
2. Select the neutron porosity curve in the basic curve drop-down box and the density porosity (or sonic porosity) curve in the second curve drop-down box then click OK.
Note: You cannot shift the delta phi curve by
depth or edit its values. Instead, these are automatically updated when
you modify the basic and second curves.
Delta Phi curves are created for all the wells with the basic and second curve you selected.
Using Delta_Phi curves as shale indicatorsFor reservoir rocks with a gamma radiation variation that isn't associated with presence of clay, generate a Delta Phi curve and use this instead of the GR curve as the shale indicator. After creating the Delta Phi curve, double-click the log to display the Single Well Properties dialog box and select the Shale tab. Select Delta_Phi in the shale indicator drop-down box and then type values in the clean rock and shale value boxes for each well (usually the minimum and maximum of the Delta Phi curve.) |
