Comparator module is used to compare two seismic gathers and identify differences in their trace headers. It is primarily intended for quality control (QC), data validation, and pre-processing checks before applying further seismic processing steps.
This tool ensures that two gathers are compatible for operations such as subtraction, stacking, migration, or attribute analysis etc.
The Comparator helps the user to:
•Verify consistency between two gathers
•Detect mismatches caused by resampling, editing, or format conversion
•Prevent processing errors due to incompatible data geometry or sampling
Input item 1 - provide the 1st gather for comparison
Input item 2 - specify the 2nd gather for comparison
Ignore fail state when inputs are not equal - by default, FALSE(Unchecked). This option allows the user to ignore the warning messages or stop the program from proceed further.
There are no parameters available for this module.
Skip - By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.
There are no output data from this module.
There is no information available for this module.
In this example, we are reading two input gathers which got same number of traces and same number of samples and sample interval. In another workflow, we change the no of traces, no of samples and sample interval and execute the workflows.
In the 1st instance, we directly compare two gathers i.e. bin gathers and denoise gathers. Both of them are having same no of traces, sample interval and no of samples. When we execute the module we should expect that there shouldn't be any warning messages.
In the 2nd instance, we resample bin gathers from 4ms to 8ms. So total number of samples will not be equal to the denoise gathers which has 4ms sample interval. Now connect/reference the sample interval of resample gather output to comparator Item 1 & denoise gathers sample interval to Input item 2 of Comparator module and execute the module.
Now execute the Comparator module.
Look at the Error message. The module is telling us that both the inputs are not the same. Likewise, the user can use this module to QC the output gathers at different stages of the processing to make sure that the input and output gather at each stage are correct with respect to no of traces, samples, sample interval, record length etc.
There are no action items available for this module.
YouTube video lesson, click here to open [VIDEO IN PROCESS...]
Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist
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