Entering Grid Math Equations

Grids are sorted and stored by Gridding Geometry. To see additional horizon grids, select a different grid geometry file. Remember that all grids in an equation must have the same grid geometry.
Enter a name for the Target Grid, which is the horizon grid to which grid math calculations are made. It is the left-hand term in the equation box. Select an existing horizon grid from the pulldown menu or enter a new horizon grid (default is ‘HzMath01’). If you select Report Statistics Only instead of Create New Grid File, ‘Statistics =’ will appear as the left-hand term.
Active equation boxes are white. Equation for Time is active by default. To also create a Seismic Amplitude, Depth, Average Velocity or Interval Velocity grid change the Math for Time only setting. Click into an equation box to make the box active. Your cursor should be blinking on the right side of the equation.
You must define an equation for Time even if you are only interested in creating a grid on some other attribute. If you like, you may set the Time equation equal to a constant such as 1000ms.
To define the equations, do one or more of the following:

Double click on T[x], A[x], D[x], I[x], or V[x] under Select Grid to enter a Time, Amplitude, Depth, Interval Velocity or Average Velocity grid as a variable in the function.

Enter numbers or symbols from your keyboard or by clicking on the keypad.

For Clip and Rep functions, click the function button first then enter the parameters inside the "( )" separated by commas. To enter grids as parameters double click on the on T[x] or A[x] etc.

Select a Reference Horizon for the result grid. To post well tops on maps with your grids, the grid must be associated with a horizon.
Click Execute to start the grid math calculations.

See Grid Math Examples for more details.

Hit the C function button to clear one character or the AC function button to clear the entire equation.
Watch the Message area for help and hints.
Enter equation terms from left to right.
When creating amplitude ratios in grid math by dividing two horizon grid amplitudes, multiply the ratio by 100 in order for integer values to appear within the map window. Otherwise, any ratio value below ‘1’ will be displayed as a zero.

What do you want to do?