I have both geotiff and ascii data, but not quite sure yet which is easier to use, and how to upload and visualize bathymetry properly in Petrel. Appreciate any tips!
Dicky Harishidayat
Hi Jeremy,
Its depend on what you need, GEOTIFF is just two dimension of data while ASCII data is usually three dimension of data that you can process and edit (later) in PETREL.
You can import GEOTIFF using "image" file type in PETREL (the importing option is start with "bitmap") and assign coordinate on the setting of that GEOTIFF in PETREL. Since this GEOTIFF doesn't have "Z" factor, so its better to visualize GEOTIFF in 2D window of PETREL.
Regarding the ASCII bathymetry data:
- I usually edited this ASCII file into an X,Y,Z column of the data in Excel (Make the 1st row as the 1st line of data). Sometime, the original bathymetry data is not directly recognized by PETREL.
- Make sure that your X and Y data is aligned with your PETREL Coordinate Reference System (CRS).
- Save as this edited file as "Text tab delimited" to make it an ASCII again, import this file to PETREL using "general lines/points".
- The pop-up import window of PETREL then will appear, choose "points" and for bathymetry data make sure to activate "PETREL usually has negative in Z".
- At this stage, your bathymetry data is still in points with attributes of X, Y and Z information. On the processes panes of PETREL or "Seismic Interpretation" ribbon, click "Make/edit surface" and put this points data as an input (Click the data on the input panes and click blue arrow at pop up window of this processes). On the "Suggest settings from input" option, choose "well tops/points (high density)". On the "geometry" setting - "grid size and position", choose "automatic from input data" and type the resolution of the bathymetry data on the "Grid increment" (See the acquisition and processing report). In addition, you can "keep as it is" for other setting on this processes. Click "Ok".
- Your bathymetry data is now in 3D (surface), you can visualize it on the 3D window of PETREL (If you are not toggled-on this option at the previous processes). Some surface attributes and surface editing (activate PETREL tools palette - surface editing) are also available in PETREL if you need to processes this 3D bathymetry surface.
- You can also overlay and blend this 3D bathymetry surface with other data in PETREL (e.g., magnetic, seabed classification, etc.)
Hope it works.
Cheers
Dicky
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