Changes

* Discriminate against invalid data. Using this technique, the user specifies minimum and/or maximum value limits for a primary trace. Then, instead of modifying actual trace values, the trace is scanned, and at depths where data occur outside the limits, flags are set in a separate discriminator trace. When applying the discriminator trace during data displays or calculations, any depths containing flags will either be eliminated from the display or be assigned default calculation values.

* Discriminate against invalid data. Using this technique, the user specifies minimum and/or maximum value limits for a primary trace. Then, instead of modifying actual trace values, the trace is scanned, and at depths where data occur outside the limits, flags are set in a separate discriminator trace. When applying the discriminator trace during data displays or calculations, any depths containing flags will either be eliminated from the display or be assigned default calculation values.

* Apply depth corrections. These fall into two categories:

* Apply depth corrections. These fall into two categories:

 

*#Depth shifting traces against each other. To do this, the user visually compares base and unshifted traces, marks corresponding data points (Figure 1), and then shifts the off-depth data to the base trace depths.

<list-item>Depth shifting traces against each other. To do this, the user visually compares base and unshifted traces, marks corresponding data points (Figure 1), and then shifts the off-depth data to the base trace depths.</list-item><list-item>Correct for true vertical depth (TVD), true vertical thickness (TVT), and/or true stratigraphic thickness (see “Preprocessing of Logging Data”).</list-item>

*#Correct for true vertical depth (TVD), true vertical thickness (TVT), and/or true stratigraphic thickness (see “Preprocessing of Logging Data”).

* Baseline the spontaneous potential (SP). Interactively flattening the SP to a shale baseline at a single value (Figure 2) allows the user to look at SP values quantitatively in order to calculate water resistivity (''R''_w) and estimate shale content.

* Baseline the spontaneous potential (SP). Interactively flattening the SP to a shale baseline at a single value (Figure 2) allows the user to look at SP values quantitatively in order to calculate water resistivity (''R''_w) and estimate shale content.

* Convert data scales (both ways): conductivity to resistivity, raw data to porosities, neutron porosities to a different matrix, metric to English depth units, percent to decimal, and so on.

* Convert data scales (both ways): conductivity to resistivity, raw data to porosities, neutron porosities to a different matrix, metric to English depth units, percent to decimal, and so on.

where

where

* Rename, copy, and delete curves.

* Rename, copy, and delete curves.

* Test and set curve values. If a trace value satisfies a criterion (such as ), then modify the value as specified.

* Test and set curve values. If a trace value satisfies a criterion (such as ), then modify the value as specified.