Modify/edit already calculated GSD files with different parameters
This module is helpful in editing already calculated GSD file. For example, the user executing some denoise procedure inside the seismic loop and the job is finished. The output files will have .gsd, .gsd.sgy & .gsd.tmp in the output folder. This .gsd.tmp file holds all the information whether all gathers are completed the task or not. This file is useful when the user wants to make any parameters adjustments for a particular region/area/gathers. In that case, the user should provide a polygon to specify the gathers that should be considered for the new procedure within the polygon or outside the polygon. Also, the sorting order is very important. Previously whatever the sorting order was used, the same sorting order should be considered for the rerun.
Similarly, when the user executes Migration procedure also it will generates a temporary file with an extension of .gsd.tmp.
Input calculated filename - specify the already calculated filename. Make sure that the .tmp file should be existing in the output folder otherwise the program will throw an error message.
Input sorted headers - connect/reference to the output sorted headers.
Input polygons - connect/reference to Output polygons. This input polygon is used for selecting the data within or outside the polygon area.
Output filename - specify the new output file name. This output will have the old gathers (with old parameters) along with new gathers (within/outside polygon) with new parameters.
Update existing file in direct - this will update the existing file in the directory. By default, FALSE.
Set not calculated { In the polygons, Outside the polygons } - choose the option from the drop down menu to NOT TO consider the area.
In the polygons - this will not calculate the gathers within the user provided polygon
Outside the polygon - this will not calculate the gathers outside the user provided polygon.
Trace headers for find input - choose the trace header from the drop down menu to find the input data. Based on this trace header, the program checks with data and performs the new task.
Trace header - displays the user selected trace header type.
X axis - considers BIN-X value as default.
Y axis - considers BIN-Y value as default
Skip - By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.
There is no output data vista items generated by this module. Final output file name should be mentioned in the Parameters tab.
All chunks count - displays the total chunks/traces/gathers count
Input calculated chunks count - displays the input file calculated chunks count
Output calculated chunks count - displays the output file calculated chunks count
The objective of this workflow is to change the processing parameters when required for a particular region/area selected by polygon. During the processing sequence we often apply the same parameters for the entire line or volume however in some cases we want to apply a different parameters (soft/harsh ) to a particular region/area. For this kind of approach, we consider this workflow.
In this example workflow, we are performing a simple task by applying band pass filter. However, we prepare the workflow in 3 parts. In the
1st part - Apply band pass filter for full line
2nd part - choose an area (by polygon) and get an output for further processing
3rd part - take the output from 2nd part and reapply the bandpass filter for the area chosen by polygon only. In this part, we are changing the band pass filters for the region selected by the polygon.
In the 2nd part, we pick a polygon by selecting the area. For more detailed information on how to pick polygon, look into Polygon picking help.
In the 3rd part, we take the output from the 2nd part and slightly modify the band pass filter parameters and re-execute it.
Update location map - this will display the updated location map. In case the user selected not to consider inside the polygon then there will be a gap in the updated location map.
YouTube video lesson, click here to open [VIDEO IN PROCESS...]
Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist
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