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 (This is for a stand-alone four-component rotation. It can be skipped if the full Anisotropy Wizard will be run as it is also part of that processworkflow.)

i. In the Geophysics Toolbar, expand the options for Anisotropy processing (click the inverted triangle on the lower right corner of the button)

Figure B1: Window showing the Four-component rotation button in the Geophysics toolbar and the associated Workflow manager.

ii. Select Four-component rotation. A new Workflow manager window will appear.

iii. Click on the newly created DSI dataset and drag it into the Method settings panel to the right of the workflow window.

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v. Click on the blue Play button. A Log Plot window will appear, displaying all the relevant curves resulting from the process.

Figure B2: Resulting log plot from the four-component rotation processing.

C. Anisotropy Wizard

In the Geophysics tab, expand the Anisotropy processing button and select the Anisotropy wizard.

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Step 3: STC DTSM_Fast Receiver Array

Slowness time Time Coherency (STC) processing of the DTSM_Fast Receiver Array waveform that resulted from the preceding 4-component rotation in Step 2.

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Step 3A: First, go through the single depth processing mode for the entire depth range in order to initialize the parameters. To automatically step through the entire depth, click on the blue fast forward buttton (Fig. C5)

Figure C6: Step 3A Single depth mode window and (right) resulting STC and waveform plots.

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Figure C9: Step 4B STC DTSM_Slow receiver array full depth processing and resulting log plot (full detail to the right).

Step 5: Anisotropy Port Post Processing

Final result of the Anisotropy processing as shown in a log plot, defining the degree of acoustic anisotropy for each interval.

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Gilles Guerin (LDEO-BRG) provided valuable guidance in creating this user guide.

Archived Versions

Acoustic Anisotropy Processing in Techlog - 27Sept2022