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Right-Click menu
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Task
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Curve Color
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Changes the color of the curve on the Log Curve Pre-viewer. This does not change the logs' display color for the cross-section or anywhere else in the project.
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Previous Zoom
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Returns to the last zoomed view
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Zoom In By 2X
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Zooms in on the upper part of the log curves.
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Zoom Out By 2X
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Zooms out
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Scroll Up
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Scrolls up through the logs
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Scroll Down
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Scrolls down through the logs
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Default Depth Range
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Resets the depth range to the defaults set on the Main Module's Logs tab.
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Show Curve Header Info
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Displays log information: depths, step interval, total number of data points, depth units, and various statistical measurements.
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Set Log Curve Scale
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Opens the Set Log Track Scale and Data Correction Tool
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Corrections and Rescale
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Opens the Set Log Track Scale and Data Correction Tool
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Stats Histogram
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Displays a frequency histogram of the selected log showing data range, mean, standard deviation, mode, and sample counts.
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Query Depths
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Displays a small window with the start and stop depth, step increment, and the total number of points in the well.
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Delete Log Curve
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Deletes the selected log from the project database.
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Merge Log Curves
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Merges the data from a "Source" log into a "Target" log. Follow the prompts at the bottom of the screen to first click the left mouse button on the "source" and then the "target" log. To cancel the merge operation, click the right mouse button.
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Copy Curve
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Creates a copy of the curve with a different name.
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Draw Curve
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Draws in a log curve. After selecting this option, the curser turns to a pen icon. Click once to start drawing, and again to add successive points. Right click to stop drawing points.
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Draw Curve Shift
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Graphically moves the selected log curve.
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Interpolate Nulls - Linear
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Interpolates between null values by simply drawing a straight line between the adjacent data points.
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Interpolate Nulls - Cubic
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Interpolates between null values by fitting a curve to the nearest adjacent data points.
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Null Curve Section
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Sets log digit values to a null over a given depth interval. The depth interval is defined using the depth range selection technique described earlier.
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Shift Curve Starting Depth
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Used to shift the starting depth of a log up or down by a given amount. A positive shift amount shifts the log deeper while a negative value shifts the log shallower.
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Shift Using Depth Pairs
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Shifts the log curve's depths with a set of drawn depth pairs. Note that Petra will stretch and squeeze the log in order to accommodate multiple depth pairs.
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Smooth Log Curve
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Smoothes or filters the selected log digits with a triangular smoothing filter. The number of filter coefficients can be set from 3 to 25 by selecting Logs>Set Smoothing Strength on the menubar at the top of the screen.
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De-Spike Curve
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Clips anomalous data outside a rectangular region drawn on a curve. The user draws a rectangle over the curve section that defines the depth range and low and high amplitude values allowed. Curve values falling outside the rectangle (either to the left or right side) are first set to null then new values are interpolated for each of the null values using the remaining good data samples.
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Change Depth Units
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Changes the depth units of the selected well. Note that this will affect all curves with the logs definition.
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Alter Sample Rate
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Changes the sample rate of the selected curve.
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Cutoff Line
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Simply draws a straight line at the specified value. This can be useful for evaluating curves or for finding anomalous values. To remove the line, enter a cutoff of "0."
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Drop Curve From Display
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Removes the selected log from the screen (does not delete the curve from the database).
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Move Curve Left 1 Track
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Moves the curve one track to the left.
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Move Curve Right 1 Track
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Moves the curve one track to the right.
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Restore Original Curve
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Restores the the original log digits from the log database. Any changes made to the log are not saved.
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or hold down the Shift key then click and hold the left mouse button at the minimum depth. Drag the mouse over the desired depth interval and release the button at the maximum depth. Once in zoom mode, you can scroll the screen up or down by 1/3 of the screen height. A pop up menu displayed with a right mouse button click provides additional zoom and scrolling options.