Tops mode - curve preview

Tops mode

Log mode is the default mode for the log curve preview tool. However, the Log Curve Pre-viewer can also correlate formation tops in formation tope mode. To enter Formation Top Mode:

·Check the "Show Tops" checkbox on the tool bar

·Select Tops>Show Tops from the menu

Selecting the formation tops to display

To select which tops appear on the Formation tops drop-down menu:

1.Verify that Show Tops is selected on the tool bar.

2.Click Tops >Select Tops. The Select Zone Item List dialog will appear.

3.Use the dialogs controls to load and select the zone items you want available from the drop-down

Changing formation top values

Moving an existing top

Tops already in the database are displayed as a single line drawn across the depth track.  As the cursor is moved over the top's line, the line turns white to indicate it is active. While a top is active (white), it can be dragged up or down on the depth axis by clicking and holding down the left mouse button. The top is redrawn at its new depth value when the right mouse button is released.

Correlating a new top

To correlate a new top, select the desired top in the tops dropdown box at the top of the screen.  Next, select the  button or Tops>Correlate on the menu bar at the top of the screen.  The cursor will jump to the center of the screen with the correlation line. Position the cursor at the appropriate depth and click the left mouse button. The screen will redraw with the new top value.   The correlation can be canceled by clicking the right mouse button instead of the left button.

Top values are not stored back to the database until (1) you reselect tops, or (2) you exit the log preview screen. In either case, you are prompted before the database is updated.

Round Tops Values - When checked, this Tops-Menu option causes top values to be rounded to the nearest whole foot or meter. This option only affects values that are changed using the cursor procedure described above.