|
<< Click to Display Table of Contents >> Navigation: Phase > Trim statics - Apply |
Trim statics – Apply applies a set of pre-computed trace time shifts (trim statics) to a seismic gather to improve event alignment at the CMP level. Trim statics are small residual time corrections (typically ±5–25 ms) that remove trace-to-trace timing variations caused by near-surface velocity heterogeneity, inaccurate first-break picks, or residual moveout after NMO correction. The corrections are applied via high-quality 8-point or linear sinc interpolation to shift each trace by the required amount without introducing aliasing artefacts.
The time-shift values can be supplied either as a Trim data gather (a gather in which each trace stores its own shift value, typically computed by the Trim statics – Calculate module) or as a Trim file (a previously saved GSD file of shift values). When taking parameters from additional headers, the processing window limits (From time, To time, Window) are read automatically from the trace headers stored in the trim gather; otherwise they are set manually.
The primary data connection carrying the seismic dataset. Transports the SEG-Y file handle, trace headers, and geometry objects through to the output.
Reference to the SEG-Y file object. Passed through to the output.
Trace headers for the seismic dataset. Used to match each input trace to its corresponding trim static entry. Passed through unchanged.
The NMO-corrected CMP gather to which the trim statics will be applied. Each trace is shifted by its corresponding time correction from the trim data source.
Stack line geometry item, passed through to the output.
Crooked line geometry item, passed through to the output.
Bin grid geometry item, passed through to the output.
Sorted trace header index, passed through to the output.
Selects how the trim static shifts are provided. Gather (default) reads the time shifts from a connected Trim data gather item, typically the output of the Trim statics – Calculate module. Trim file reads the shifts from a previously saved GSD file. Use Trim file when reprocessing data using statics computed in a previous session.
The output gather from the Trim statics – Calculate module containing the per-trace time-shift values in its trace samples. Connect the Output gather of the Trim statics – Calculate module directly here. Active only when Input trim data type is set to Gather.
Path to a GSD file containing the trim static shifts previously saved to disk. Active only when Input trim data type is set to Trim file.
When enabled (default), the From time, To time, and Time window parameters are read from the additional trace headers stored in the trim data gather (written there by Trim statics – Calculate). Disable this option to override those values manually when the headers are not available or when applying a different time window than was used during calculation.
Start time of the application window over which the trim shift is applied, in seconds. Default: 0.1 s. Only editable when Take params from additional headers is disabled.
End time of the application window, in seconds. Default: 3.0 s. Only editable when Take params from additional headers is disabled.
Length of the cross-correlation window used when reading shift parameters, in seconds. Default: 3.0 s. Only editable when Take params from additional headers is disabled.
Algorithm used to resample traces when applying the sub-sample time shifts. Default: 8-points. 8-points sinc interpolation is more accurate and better preserves the frequency content of the shifted traces. Linear interpolation is faster but can introduce mild high-frequency distortion. Use 8-points for final production processing.
When enabled, the module automatically connects to adjacent modules in the processing flow.
Controls how corrupted (NaN) samples are handled. Fix replaces bad values. Notify stops and reports. Continue proceeds without correction.
Selects whether the processing is performed on the CPU or a compatible GPU.
Options for distributing the computation across multiple nodes in a cluster environment.
Minimum number of gathers in each distributed computation chunk.
Maximum number of CPU threads per distributed node.
Optional text suffix appended to the distributed job name.
When enabled, allows specifying a custom CPU core affinity mask for the processing threads.
CPU affinity mask. Only active when Set custom affinity is enabled.
Number of CPU threads used for parallel application of trim statics. Set to the number of available physical cores.
When enabled, this module is bypassed and the input data passes through unchanged.
The output data connection carrying the trim-static-corrected dataset.
The SEG-Y file handle passed through from the input.
The trace headers passed through from the input.
The gather with trim statics applied. Each trace has been time-shifted by its corresponding correction value using the selected interpolation method. Connect this to the next step in the processing flow (e.g., stack or further noise attenuation).
Stack line geometry item passed through from the input.
Crooked line geometry item passed through from the input.
Bin grid geometry item passed through from the input.
Sorted trace header index passed through from the input.