Seismic interpreters may sometimes need to see the topography posted at top of seismic sections to QC the statics, etc. Unfortunately, there is no option to insert the elevations directly on top of 2D seismic lines in IHS Kingdom. Well, here is a very simple workaround to do that:

Step-1 Creating a Horizon and Exporting:
– Create a dummy horizon near top of a 2D seismic line. Let’s call it “linename_elevation”
– Go to Horizons>Export>Horizons
– Select “X Y Time” as the data format to output in simple text format
– Select the newly created “linename_elevation” horizon and the associated 2D seismic line
– Select “Tab” as the deliminator
– Export

Step-2 Extracting Elevations from SEGY Header:
– Open the original SEGY file and extract the elevations from its header in “X Y Elevation” format
– Later, we will use X-Y pair as our reference to combine the elevations from the SEGY file with exported “linename_elevation” horizon file

Step-3 Converting to TWT:
– Open “linename_elevation” horizon in MS Excel
– On the side, open “X Y Elevation” file from SEGY header in MS Excel, as well.
– We will use the “linename_elevation” as our reference data
– Copy the “Elevation” column and paste it in the “linename_elevation” spreadsheet
– In order to convert “Elevations” into “TWT”, divide it by 1000 and multiply by (-1)

TWT=(-1)*(Elevations)/1000

This is really like using 2000 m/sec as the replacement velocity. Multiplying by (-1) is for posting the “linaname_elevations_twt” above the zero TWT which is usually the 2D seismic displays starts. By the way, you do not need to worry too much about the exact replacement velocity or (-1) multiplication since we will bulk shift it later anyway.

Good thing about this formula is it doesn’t change the elevation value, and -0.281 sec TWT can be read as 281 m.

– Open the original exported “linename_elevations” file
– Order the columns as “X Y TWT” in the MS Excel spreadsheet
– Now, make sure the X-Y columns are exactly same in numbers of digits, etc. For example;

544537.000000 3840036.000000 -0.281
544546.533334 3840027.933333 -0.283
544556.066668 3840019.866666 -0.283
544565.600000 3840011.800000 -0.284
544575.133335 3840003.733332 -0.284

– Copy the entire “X Y TWT” colums and paste it into the original “linename_elevations” file
– File>Save in order to preserve the text file format (you may have to close the MS Excel files for saving). This will replace the original exported file with TWTs as the third column in it.

Step-4 Importing:
– Go to Horizons>Import
– Select the “linename_elevations”
– Give a name such as “linename_elevation_twt”
– “2D” as the survey type
– “X Y Time” as the format of input file
– Select the original SEGY type of the 2D line, i.e. MIG, PSTM, etc.
– Time unit is in “Seconds”
– Import

Step-5 Displaying:
– Go to View>Settings>Vert Scale
– Set Range to “Specify”
– Set Data Starting Time to a TWT time scale so that the imported horizon will be visible on top of your 2D seismic section.

Step-6 Bulkshifting:
This step is really depends on where you prefer to display the elevations.

– Go to Tools>Calculators>Extended Math
– Select “linename_elevations_twt” and assign it as “A”
– Type “A+0.45” in the Formula bar for 0.45 seconds for bulk shifting DOWN. The amount of bulk shifting of course depends on your Kingdom project. On the other hand, it will be also a value for you to specify depending on your 2D seismic display preference. Bear in mind that you will need to use the same amount of bulk shifting for all the other 2D seismic lines during the course of this elevation posting steps.
– Give a output surface name, i.e. “linename_elevations_twt_bulkshift”

Please have a look at this image as an example. By the way, not all the 2D seismic lines are cropped according to the topography as it is the case in this example.

Please bear in mind that this procedure is simply for display purpose.

Good luck!