Tying seismic to models
Tie seismic to a model in the current synthetic for correlation purposes and for reverse AVO modelling.
Kingdom users tie the seismic using GeoSyn, and then save the resulting time/depth chart back to Kingdom to assist with the creation of future synthetics.
To tie seismic to models:
- Right-click the seismic trace and select Tie Seismic to a Model from the popup menu.
The Set time and range for dialog box opens.
- Select the time and trace range that includes the well from which the synthetic is created, and then click OK.
The Select Data Sets for Cross-Correlation dialog box opens.
- In the Model Data drop-down list, select a model to which to tie the seismic trace, and then click Continue.
The Tie Seismic dialog box opens.
- Select from the following options:
GeoSyn automatically aligns the seismic trace and model trace at the point of best fit. To move the point of best fit to another seismic trace, drag the slider at the bottom of the seismic sample left or right.
To move the seismic trace up or down in relation to the model trace, in the Cross correlation function pane, drag the vertical slider up or down. The amplitude values for the Amplitude and the Amplitude Envelope appear to the right of the slider.
Drag the green and the blue horizontal lines that limit the data range to exclude unwanted data that appears at the top or bottom of the model or the seismic, which may interfere with the selection of the best tie.
To change the seismic phase or the model phase, drag the sliders or type values in the boxes below the Phase label in the bottom-left of the dialog box. The results appear in the Cross Correlation Function area of the dialog box where the red signal represents the seismic pulse and the black signal represents the amplitude envelope.
To stretch and squeeze the sonic to improve the tie with the sonic, click Stretch/Squeeze to display the Stretch and Squeeze dialog box. Hover the cursor over the seismic at the point to tie. Click to set the first tie anchor, and then hover the cursor over the correlating tie point on the model. Click to place the second anchor, which ties the seismic to the model.
Select multiple points using the above process. For details on stretching and squeezing traces, see Correlating Logs and Traces below.
Select multiple points using the above process. For details on stretching and squeezing traces, see Correlating Logs and Traces below.
To zoom the seismic pane, 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. Once you've zoomed in, use the Zoom Out option to restore the original screen extents. You can Zoom in multiple times to increase magnification and improve accuracy
)), and then drag the extents to zoom. Once you've zoomed in, use the Zoom Out option to restore the original screen extents. You can Zoom in multiple times to increase magnification and improve accuracy To change the trace pane displayed in the Tie Seismic dialog box in either the Model data or the Cross correlation function pane, hover the cursor (
) over the display to move then click and hold while dragging the display pane up or down.
) over the display to move then click and hold while dragging the display pane up or down.- Click OK to close the Tie Seismic dialog box.
- Select whether to shift the synthetic or the seismic (bulk shift), and then click OK.