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Attributes In Seismic Data Displays

ProductName calculates instantaneous amplitude, frequency, and phase, apparent polarity, and the cosine of instantaneous phase on the fly and displays them on your seismic window. Display one attribute in color, and the other with an overlaid wiggle display. By default, both the active and inactive attributes are the seismic amplitude.

You can display two attributes at a time: one active, and the second inactive. If you pick on an attribute display, the values of the active attribute will be written to your pick file. The attribute display is scaled for maximum dynamic range.

Available attributes

The following attributes are available ProductName:

• Seismic amplitude - This is the default attribute that ProductName uses, as it is most commonly used in data interpretation.
• Instantaneous amplitude - Choose this attribute to represent reflectivity. It is also an effective discriminator for bright spots, which can indicate sequence boundaries.
• Instantaneous Phase - Choose this attribute to calculate the phase at each sample location. Like instantaneous frequency, it emphasizes the spatial continuity or discontinuity of the reflectors, by making the stro?ng and weak events appear to have equal strength. This helps in highlighting discontinuities of reflectors, faults, and pinch-outs.
• Cosine of Instantaneous Phase - Choose this attribute to calculate the phase at each sample location. Your data is displayed as continually smooth, with the peaks and troughs retaining the same position, but the strong and weak events having equal strength.
• Instantaneous Frequency - (optional calculation parameters can be set). Choose this attribute when you want physical information like bed thickness, presence of hydrocarbons, and fracture zones. Your data will appear in a time derivative form that emphasizes spatial continuity and discontinuity for reflections by making weak and strong events appear with equal strength.
• Apparent Polarity - Choose this attribute when you need to be sensitive to the quality of the data, and assume its zero phase. You can use it with other attributes as a good indicator for hydrocarbons. It's a good seismic attribute to distinguish between various kinds of hotspots.

Displaying Attributes

1. Select a color display mode with an overlaid wiggle trace:

• Overlaid Wiggle AreaO
• Overlaid Wiggle o
• Colored AreaC

2. From the Seismic Menu Bar select Display | Display Attribute .
3. Select which attribute you would like to be the active attribute. That is, which attribute you would like to be the source for your amplitude picks. Select the inactive attribute. This is, the attribute you would like to be displayed but not picked as an amplitude. Choose to display each attribute as a wiggle or in color.

• You can set the upper frequency limit and the smoothing gate for instantaneous frequency by clicking on <Options> in the attribute window. Enter an upper limit between 0 and 250 Hz and a smoothing gate between 0 and 100 ms.
• You can use the Copy And Paste parameters to transfer your attribute display parameters to new seismic window.
• The status line in the lower left-hand corner of the main window reports the values for the active attribute as you pass your cursor over the seismic window.

What do you want to do?

• Change the seismic display mode