Geo-spatial data integrity checks

Exploration and production projects contain data of which over 80% is geo-spatially referenced to a coordinate reference system (CRS).  In order that all geo-spatially data, within a project, fits together harmoniously it is important to understand the geo-referencing of each individual data set and the relationships between different data sets.

A project may contain some of the following:

  • 2D seismic lines
  • 3D seismic volume(s)
  • Well surface positions
  • Well bore surveys
  • Well logs
  • Platform positions
  • Pipeline positions
  • Bathymetry
  • Geo hazard surveys
  • Block boundary / concession boundary definitions

Project schema

It is unlikely that all the original survey data read into an interpretation project will be referenced to the same coordinate reference system or that, particularly with vintage data, all metadata is provided. Therefore, it is essential that this metadata / information is identified where possible. If not possible then the analyst must give the project team(s) an idea as to the size of the horizontal and vertical errors contained in the data.

Project Database – Base CRS = WGS 84 / UTM zone 49N

Data set 1 – 2D seismic lines = Timbalai 1948 / RSO Borneo (ft)

Data set 2 – 3D seismic volume = Timbalai 1948 / UTM zone 49N

Data set 3 – Concession blocks / International boundaries = WGS 84

Data loader must know to which CRS is that is referenced to prior to data loading.  They must then select the appropriate CRS from the CRS catalogue during data loading. Typically, during the data loading process the software will perform an ‘on-the-fly’ transformation from the data CRS to the project CRS.

Examining, and where necessary, correcting positioning data sets is a fundamental requirement to ensure the integrity of the workstation project is maintained.  Checks can be made to all these data types and more to ensure no ambiguity remains within the project.

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