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Re: creation of common velocity stacks Link to this post

in previous when we click the cvs button and selct the window in the stacks and get the CVS fuction of that selected window.
In new version, when press the cvs button and wants to select the region on stack, it selct the cdp location, not select the region or full stack.
how we select the region on stack after pressing tthe CVS button on 5.6 verson.

creation of common velocity stacks Link to this post

hi all

how to create the common velocity stacks in the claritas, means that every stack made with single velocity.

Re: creation of common velocity stacks Link to this post

You can create - and pick on - constant velocity stacks in the CVA tool; you set this up on the Analysis Calculation Parameters form, selecting "Constant" in the first box. The VVS button on the main stack display then becomes a CVS button, and you can use this to create CVS displays.

If you want to make CVS as part of a batch job so that you can save the output, hardcopy or review in XVIEW, the easiest way would be to :

- read in the selected CDP gathers you want to work on with DISCREAD
- use the REPEAT option in DISCREAD or the REPEAT module) to create repeasts of the data
- apply an NMO correction that varied with REPEAT
- stack the data with STACK etc.

To create an NMO file that varies with a primary key of REPEAT (as opposed to CDP) you would just use the using the xsde control files editor.

This NMO file would need to have two TV pairs for each REPEAT value, but you would only need to specify the velocity function for the first and last REPEAT value.

In the attached example, with 10 REPEATS, you would have velocities from 1500m/s to 2400m/s.

Re: creation of common velocity stacks Link to this post

This is also a configurable option. On the main stack window, select Params and then open the Analysis location parameters form.

The first entry on this is Analysis positioning. This is a light grey colour, meaning you can't type anything in, but if you click on the list button you can choose between options.

The default for this is "at nearest V(t)", which means when you click, it jumps to the closest existing function.

The option you are after is "click and drag" - when this is selected all analysis types will be located based on the region you select with the mouse on the stacked section.

You can also cycle through the options with the Escape (Esc) key.

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