469 Posts in 230 Topics by 67 members
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Third V7-0 beta release - 21 October 2019
We have completed the third release sprint of the development version of GLOBE Claritas V7-0 and have just provided a download for this latest beta release to our Linux clients. This is the first of an anticipated 5 or so beta releases before the full V7.0 release in December. Some of the features in this beta release include:- • GRIFFON – Option within the trace header listing window to select additional headers to display or to display all headers • SEISCAT – Can launch the CVA app... 2 months ago |
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Offset regularitation, supergather, Radon and SRME
Try setting the DATUM parameter in the FLATTEN module to a value greater than the first waterbottom multiple and increasing the tracelength appropriately so no data is lost off the top or bottom of the traces. It's looking like the FKMUTE module might actually be a better option than the QFK module. As with the QFK module the FKMUTE module also has a TWIN_TIMES parameter if you want to time-window your data. 2 months ago |
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Offset regularitation, supergather, Radon and SRME
Hi Alejandra, could you send your jobflow, logfile, some example data, *.smu mute file to claritas.support@gns.cri.nz - we can then take a look, try to have a bit of a play here, and get back to you with any suggestions/comments. Cheers 2 months ago |
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Offset regularitation, supergather, Radon and SRME
I'm getting some problems with the FLATTEN and QFK modules that I cannot solve. FLATTEN module return the following error: "Data cannot be shifted above 0s, please increase datum". I tried increasing it until 5000 ms but I got the same error. I fact, I don't understand the problem. If I understood correctly the module's help, the module just shift each trace from the time defined for the multiple using the corresponding horizon or header+scalar to the time defined in the Datum parameter. Is... 2 months ago |
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Offset regularitation, supergather, Radon and SRME
In the FLATTEN module the user can specify either a digfile and horizon (using the DIGFILE1 and HORIZON1 parameters) OR a trace header (using the HEADER1 - specify a header value that contains the times of an event you want to flatten, and optionally SCALAR1 - scalar to multiply the values seen in HEADER1, parameters). If the sea floor has been stored in the headers (for example DELAY, ms), a scalar of 2 would flatten the first water-bottom multiple, and so forth. A second horizon can also be us... 2 months ago |
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Offset regularitation, supergather, Radon and SRME
Thank you for the explanation. I have one more question. I'd like to test flattening on offset planes for the shallow part of my profile as the example in your "Demultiple routes" presentation but I'm not sure about the steps. Would the next job be correct if I apply this method pre-stack (in the shots)? Before, perform offset regularization on the data and write shots in hdf5 format 1. SEISREAD - Read shots.hdf5 file using PKEY=offset and SKEY=shotid in order to sort data to offset pla... 2 months ago |
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Offset regularitation, supergather, Radon and SRME
The PRT_DEMULT module can be run with the MODE parameter set to Land or Marine, so doesn't require offset regularisation - but will run faster if the data does have a regular offset (MODE=Marine). For Land processing, the offset distribution is expected to be different for each gather, so the parabolic radon transform (PRT) operator must be re-calculated for each gather. This is by far the slowest part of PRT filtering. For MODE=Land, the offsets are taken from the trace headers. Whereas for mar... 2 months ago |
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Offset regularitation, supergather, Radon and SRME
Hi, I'm trying to demultiple multichannel data from a 480-channels 6 km streamer between 150 and 3000 m water depths. The data were shot at 37.5m interval. The nominal CMP fold is 80, but can be 87 in some CMPs (geometry defined using ukoaa P1/90 file). The group spacing is 12.5 m. I would like to perform radon demultiple using CMP gathers in orther to obtain a better result and avoid aliasing. So I'm combining 6 CMPs into 1 supergather. My question refers to the need to perform an offset r... 2 months ago |
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Second V7.0 Beta release is now available
We have just released the second Beta release for V7.0, if you are a current supported GLOBEClaritas client and would like a download link please get in touch, new features in this Beta include :- • DENOISE_TF module, supports windowing of the denoising solution. • DENOISE_TF – Improved noise modelling for the windowed data. • DENOISE_TF – Improvements to runtimes. • RADIAL – Module now handles duplicate offsets more effectively. • SEISCAT – Can now launch the REFSTAT2D/... 4 months ago |
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V6.10 3D Land Tutorial
An updated version of our 3DLand tutorial is now available from the GLOBClaritas team for users, extends the topics covered in the tutorial beyond just the Geometry and Refraction statics that the original tutorial covered to include, noise attenuation. decon, residual statics and imaging. Contact claritas.support@gns.cri.nz for the download information. 5 months ago |
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