420 Posts in 208 Topics by 63 members
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What is a typical 2D marine geometry workflow?
Hi, just a quick technical question on an old topic... Following the proposed simple work flow (addp190, offreg, mgeom) the MGEOM processor will automatically overwrite the offsets when assigning the CDPs and CDP traces (in CDP a OFFSET mode). Is it recommended to save the offsets after the OFFREG processor and re-apply them after MGEOM? Cheers! 2 years ago |
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What is a typical 2D marine geometry workflow?
Here's an extended version of the poweroint, showing the different options. 8 years ago |
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What is a typical 2D marine geometry workflow?
Hi Ted - The simple 2D marine geometry set up in MGEOM is direct straight line, with no perpendicular offset. One approach you can take is to use the [b]geometry [/b]tool, which supports a source-streamer file type with perpendicular offset, or can work with P/190 data. You'd then "bin" this inside the geometry tool, as per land data. The approach I describe is designed to manage feather (or perpendicular offset) in the case where you have P1/90 information, without using the geometry tool... 8 years ago |
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What is a typical 2D marine geometry workflow?
1) then why bother ADDP190 if you have to specify the geometry anyway - obviously I have missed something here 2) MGEOM has no place for perpendicular offsets, correct??? 8 years ago |
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What is a typical 2D marine geometry workflow?
We generally use the simple 2D marine geometry in conjunction with the MGEOM module for all 2D marine surveys. This has a number of plus points over the QSORT module, including the ability to create a "receiver location" trace header. This can be useful later in the sequence, if we want to apply Tau-P domain deconvolution or swell noise attenuation on common receiver gathers. When assigning 2D marine geometry, the easiest way to configure the parameters is to set: SHOT ID and distance to... 8 years ago |
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What is the format of geometry files for 2d_land?
Yes, sorry, the easting and northing values have had a specified value subtracted from them all - I believe 2630000 from the eastings and 6226000 from the northings. This would have been done when they were created in the ascsur utility. 4 days ago |
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What is the format of geometry files for 2d_land?
thank you I totally understood, I noticed in the headers of the SPS files that you used (map grid northing and map grid easting). are they the same as the usual northing and easting value because they seem quite different ??. did you converted them to another values?? 4 days ago |
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What is the format of geometry files for 2d_land?
To create SPS files from ascii files use the ascobl and ascsur utilities. The ascii files should store the geometry info in a regular column format, the order of the columns doesn't matter. The ascii files for the shot SPS and receiver SPS files should have columns with values for peg number, easting, northing, and elevation. While the ascii file for the relational SPS file should contain columns with the shot-ID, shot-peg, first channel, number of channels, first rec-peg. There are examples in... 4 days ago |
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What is the format of geometry files for 2d_land?
so, what I understood is that I firstly need to create ASCll files that contains the geometry data with the correct formate for SPS files ( which is explained under geometry : survey data definition and manipulation section of the manual) then I need to convert them into SPS files using ascobl and ascsur utilies. Is that correct??? 4 days ago |
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What is the format of geometry files for 2d_land?
The GLOBE Claritas geometry application can read in a variety of input file formats: • SPS – three files: shot (*.s), receiver (*.r) and relational (*.x) • *.sur / *.obl – *.sur land shot-point and receiver point positions, *.obl land shot record positions and channel configuration • *.sht or *.str / *.txy – *.sht marine shot-point or navigation points, *.str marine streamer definitions, *.txy individual trace co-ordinate positions Details on the required format of these files ca... 4 days ago |
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