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what is an optical stacking? How do I use it in seismic data?

Thank you very much for the reply. A little more querry regarding optical stacking,
this can only be used if your reflector is flat, horizontal. stacking means addition of amplitude values from 10 inlines (x-lines) together to get a single cross-lines.
Please let me know where do I get all this information..
Thanks

In seismic processing, "stacking" just means the summation of one or more seismic trace.

When the traces are summed, if there are events with the same amplitude at the same two way time value, then the amplitudes will combine together, and get stronger.

Events that are on one trace at a particular time, and not on another trace at the same time, will not get stronger.

You can use this as a method to detect weak, flat events that are swamped by other reflection signals and/or noise; this might be the "flat spot" cause by an oil-water contact, for example.

Exactly how this is implemented in the software you are using will vary - you'd need to check in the software manual or with the support desk to find out exactly what method(s) are available and how to employ them.