GeoSyn automatically picks the best tie on the trace closest to the well by default, but you can override this by dragging the slider left or right to move the green correlation line to a more similar seismic sample.
Drag the green and the blue horizontal lines that control the data range to exclude unwanted data that appears in the model or in the seismic.

Drag the slider to the right of the display up or down to move the seismic trace along the model trace so the highest value for both are correlated. GeoSyn does this automatically, but you can change it.

Drag the sliders to the right of the Seismic and the Model boxes (or type directly in the boxes) to manually align the phase between the seismic phase or the model phase and the amplitude area. The outcome of the signals you adjust appears in the Cross Correlation Function area. The red signal is the seismic and model phase. The black signal is the amplitude envelope. Generally, the seismic phase should be changed to match the model instead of the model phase being changed to match the seismic.

Select the range of data points to include in the active envelope. The active envelope is the vertical range that appears within the two horizontal green lines on the seismic section and within the two horizontal blue lines on the model. Note that instead of typing values in these two boxes, you can also simply drag the horizontal lines as depicted.

Data that falls outside of the active envelope is ignored when detecting the best tie point.

Move the tie to the best point in either of the following:
Current Trace - a vertical point along the existing trace that's colored green and within the active correlation range specified above.
All Traces - a vertical location amongst all of the traces that appear in the seismic section and within the correlation range specified.

Click to display the Frequency Extraction Wavelet dialog box where you extract a wavelet using a seismic section in conjunction with a model.

Click then select the top of the seismic zone to tie and the corresponding location on the model. Next, click the bottom of the seismic zone to tie and the corresponding location on the model. The Stretch and Squeeze dialog box opens where you can type more precise values for the tie points and click Apply.

Click to display the Select Data Sets for Cross-Correlation dialog box.

Click Zoom In and then move the cursor over the seismic section (the cursor changes to a magnifying glass) and then drag the extents to zoom to zoom the overall dialog box. Supports multiple zooms when tying seismic to a model.