| OpendTect User Documentation version 4.2 |
|---|
| Prev |
|
Next
|
This menu is used to create an 2D/3D-grid based output. The data is stored as a surface data (or attribute) to the selected horizon.
Some attributes consume significant calculation time e.g. coherency, curvature, spectral decomposition etc. It also depends upon the size of an input seismic volume. Therefore, calculating a surface data on-the-fly in a scene may take significant time. It may be handy to perform calculation of a surface data independently by running a process in a background (batch processing). By using a Grid output (2D/3D), the user can create surface attributes at desired horizons independently. In this way a user can take benefit that he/she can still work in the OpendTect scene by running the batch process in a separate window.
Select the quantity to output (2D/3D) from the list of stored data or attributes. The attribute is (by default) saved with its own name, but you can also edit the attribute name. Select the surface (horizon) on which the selected attribute will be calculated.
The parameter file, which is automatically created in the Store Processing Specification field, can have any name (a default name is provided) so that you can re-start the calculation process easily in case anything goes wrong during the calculation. By pressing Proceed button a batch processing window appears at where a machine(s) is selected to run the calculation process. More information on this window is provided in single machine batch processing section. After the batch processing is finished, the result will be available as a surface data: right-click on a blank horizon's attribute in the tree to select the surface data.
Stratal Amplitude is a processing tool available to compute statistics (min, max, rms, etc.) from an attribute along a horizon or between two horizons. The window can be launched from Processing > Create Grid output > Stratal Amplitude. The output will be stored as surface data (grid) saved on the top or base horizon.
In this window, select the input attribute from which the values will be extracted. The extraction may be guided by a single horizon (Single Horizon) or between two horizons (Double Horizon).
Single Horizon is used to extract amplitude along a horizon within fixed window relative to the pick.
Double Horizon is an option of amplitude extraction between two horizons. In this case, the Z-offset parameters may be defined to increase or decrease the area defined by the horizons.
Z-offset is the offset window specification above (negative values) or below (positive values) a horizon.
Area subselection field is used to specify the area within which the attribute is output. User can select the whole volume or sub-volume by pressing Select and specifying the ranges.
Amplitude options are the available statistics for amplitude extraction. Four amplitude statistics are available: Min, Max, Average or RMS.
In OpendTect a quick way of calculating isopach maps is available. It is calculated by using create isopach window. This window is launched from the Processing > Create Grid Output > Isopach sub-menu. In this window, select two horizons between which the isopach has to be computed. Write an appropriate name for this attribute in the Attribute name field. The calculated attribute will be saved as a surface data of the Calculate to.. horizon.
