Support Center Email Support Knowledge Base Videos
Geoscience > Main Launcher > Seismic Menu > Seismic Viewer > Zoom Window > Mistie

Seismic Viewer: Mistie Analysis

The Mistie Analysis dialog is used to perform interactive mistie analysis between two or more seismic lines, or between a seismic line and a synthetic. The mistie results are generated by analyzing only the data encompassed in the Zoom window.

ClosedHow do I perform a mistie analysis?
  1. Launch the Mistie Analysis dialog in one of the following ways:
    1. The Zoom Window: Click in the Mistie icon or select Mistie Analysis from the Edit menu.
    2. The Seismic Viewer: Click on the Mistie icon , and then click, hold and drag to define a zoom window. 

  2. The Mistie dialog that appears will have initial Estimates for Phase/Shift/Gain changes that need to be applied. 

  3. At the top of the dialog ensure you have the correct line in the Active and Reference fields.   All changes will be applied to the Active line.

  4. Tie the data:
    1. To let SeisWare tie the data: Click to apply all of these change. Each time the Estimate is applied, the data in the zoom window used for analysis changes, so there may be new estimates. Doing multiple iterations improves the results.
    2. To tie the data manually: Use the Phase/Gain Sliders to apply user defined changes.
    The zoom window and the cross correlation will update automatically with the changes to show how they affect your data.

  5. (Optional) To help get an optimal tie, you can apply a frequency filter.

  6. Once satisfied with the tie you can , which will store the changes in memory only, or  which will create a new permanently altered version of the line.

General Information


Mistie Datasets

Reference:  This specifies the dataset that will serve as the reference for balancing your seismic data.

Active:  This specifies the dataset that will have the new phase, static shift, and gain applied to it.

Mistie Tab

Filter reference data: When checked, this applies the filter found on the Frequency tab to the reference dataset.

Filter active data: When checked, this applies the filter found on the Frequency tab to the active dataset.

Iterate... Opens a dialog that allows the user to apply the mistie estimates iteratively to more quickly arrive at a machine generated best guess.  The user has the option to apply any combination of phase, static shift and gain estimates.



Phase: The phase slider and text area allow the user to specify a phase to apply to the active line to balance the data.

Adjust Phase: This button will apply the phase in the Estimates box to the dataset.  The estimate is a value calculated to produce an optimal cross correlation.

Static Shift: The static shift slider and text area allow the user to specify a new static shift to apply to the active line being displayed.

Adjust Shift: This button will apply the static shift in the Estimates box to the dataset.  The estimate is a value calculated to produce an optimal cross correlation.

Gain: The gain slider and text area allow the user to specify a gain to apply to the active line to attempt to match the amplitude of the reference line.

Adjust Gain: This button will apply the gain in the Estimates box to the dataset.  The estimate is a value calculated to give the active line the same RMS as the reference line.

Gain Exponent: The gain exponent slider and text area allow the user to specify a gain exponent to apply to the active line.  A gain exponent greater than 1 will apply a higher gain as you go down the trace.

Reference RMS: This is the resulting RMS of the reference dataset.

Active RMS: This is the resulting RMS of the active dataset.

Cross Correlation Window

The cross correlation window provides a cross correlation graph to aid the user in balancing their data.  The black line represents the cross correlation.  The red line represents the amplitude envelope of the cross correlation.  A balanced dataset will have the cross correlation centered over the green axes in the window.  The cross correlation is calculated over the window of data being displayed in the  zoom window. Ideally, the cross-correlation should appear as a zero-phase wavelet centered on the cross-hairs. The peak of the amplitude envelope should appear at the peak of this zero phase wavelet.


Correlation Coefficient: The correlation coefficient value represents the degree of cross correlation.  This value will vary between -1.0 and 1.0.  A negative correlation coefficient value indicates the two lines are out of phase.

Zoom In: This button zooms in the cross correlation graph over the center of the graph.  The zoom is only performed in the horizontal direction.

Zoom Out: This button zooms out the cross correlation graph after a has been performed.

Number of Traces: This specifies the number of traces on either side of the intersection of the two datasets to use for the cross correlation.

Processing  Data

Apply To Main: This applies the current mistie parameters to the main window and exits out of mistie analysis. It store the changes in memory only and looses the change when you close the Seismic Viewer. To apply these changes after applying to main but before exiting the Seismic Viewer, select Quick Processing from the Edit menu.

Process Active...: Clicking this button will launch a batch processing dialog to perform processing on the entire Active Line.  The batch job will contain the parameters from the mistie analysis dialog.  After processing the line, the new version will be defined as the working set and any subsequent seismic displays will display the processed line rather than the current version.

Save: Saves the current intersection to the database, so that it can be used with an Automatic Mistie Analysis run. This intersection can also be used for the displaying mistie dots on the Basemap. Note: The values resulting from the mistie are not saved.

Close: Close the dialog and undo any mistie parameters applied to the data.

Frequency Tab

This tab allows you to interactively adjust the frequency of the data to get a more accurate mistie.


Filtering Preferences

Filter reference data: When checked, this applies the filter to the reference dataset.

Filter active data: When checked, this applies the filter to the active dataset.

Apply filter to batch processing: When checked, this will apply the filter to the data when you choose to batch process it using the Process Active button.  Often you will want to leave this button unchecked so only the phase, shift and gain are applied when processing the data into a new disk file.


Filtering Parameters

Low Truncation: All frequencies below this value are removed.  Frequencies between this and the Low Cut frequency are smoothly ramped up using a cosine taper.

Low Cut: Frequencies between the Low Truncation and this frequency are smoothly ramped up using a cosine taper. Frequencies between this and the High Cut frequency are left unchanged.

High Cut: Frequencies between the Low Cut and this frequency are left unchanged. Frequencies between this and the High Truncation frequency are smoothly ramped down using a cosine taper.

High Truncation: Frequencies above this value are removed.  Frequencies between the High Cut and this frequency are smoothly ramped down using a cosine taper. 

Lock: When checked the first toggle will maintain the difference between the Low Truncation and Low Cut frequencies.  When checked the second toggle will maintain the difference between the Low Cut and High Cut frequencies.  When checked the third toggle will maintain the difference between the High Cut and High Truncation frequencies.

Note: If you find that the slider bars seem sluggish, it is recommended that you physically narrow the size of the pop up zoom window.  This will reduce the amount of drawing performed, improving the interactivity of the adjustments.

Also See

— MORE INFORMATION

Copyright © 2020 | SeisWare International Inc. | All rights reserved