3D Seismic QC Module
3D seismic navigation bin grids are imported and tested using this Geo Suite module.
- Grids can be intuitively defined manually or by file entry prior to the QC functions determining the usefulness of their definitions.
- Grids and be re-projected, adjusted and compared prior to being exported to a common exchange file format.
Benefits
- Intuitive user interface for bin grid definition
- Recognition of industry exchange formats
- Comprehensive QC checks to assess the correctness of the bin grid definition
- Point query function
- Re-projection function to change the geo-referencing of the data
- Re-adjustment function to re-square the bin grid
- Bin grid comparison function
- Export and reporting functions to save manipulated data.
Bin grid definition: A bin grid can be defined by several methods that involve either manual or file entry.
- Manual entry requires the specification of any combination of corner points, survey azimuth, bin increment and bin dimension. This is traditional ‘loadsheet’ approach to defining a bin grid.
- File entry enables common exchange formats such as UKOOA P6/98 and SEG Y (Rev 1) to be used along with .txt and .csv files.
Geo-referencing is achieved by specifying the CRS to which the corner coordinates are referenced. This links directly to Geo DB module.
Bin Grid QC Panel: The QC functions check to ensure the correctness of the bin grid definition. The QC tests check all aspects of the grid including:
- Rectilinearity (Orthogonality)
- Increment and bin size consistency
- Azimuth / orientation
- Geo-referencing
The metadata and QC attributes associated with the bin grid are displayed in the left hand panel. This panel can be expanded as required to display all coordinate and bin node parameters for the four corner points of the grid. This panel is shown in more detail below:
Re-projection of the grid: It is often required to change the geo-referencing of a bin grid.
The re-project function offers a mechanism to perform grid re-projecting. A new CRS’ is chosen from the user interface prior to the corner points of the grid being recomputed.
New bin sizes and survey orientations are determined after the re-projected is performed. Error trapping functions describe to outcome of the re-projection.
Re adjustment of the grid: Bin grids that have either been re-projected or newly defined may not be rectilinear.
- The adjustment function corrects the bin grid to re-attain this property.
- The adjustment is done using either an averaging or least squares method
- The adjustment errors are reported along with the newly adjusted coordinates
Export function: Once the bin grid has been edited and analysed it can be exported to one of several different file formats. The export function uses the standard Windows panel to save the file to the required directory.
Bin grid comparison
The bin grid comparison function enables two bin grids to be directly compared and thus determine the difference between them. The comparison panel will compare the originally loaded bin grid against an alternative bin grid. The alternative bin grid is loaded though the functions supplied on this panel. The differences are then computed and the values displayed in the right hand column. The lines appearing in purple indicate where differences were identified between the original and alternative grids.
Query Position Panel
A bin grid calculator is also supplied. This enables the real world coordinates of bin grid node values (i, j / bin, track / inline, xline) to be determined and vice versa.
Enter either the real world (projected or geographical coordinates) or the bin grid values and the calculator will determine the reciprocal values.