Introduction
The quality of seismic data has improved dramatically in recent years. This is due to the improvements in equipment, greater computing power (enabling larger surveys and more data points per survey), processing algorithms and different acquisition techniques (e.g. introduction of ocean bottom cables and nodes). The aim of this document is to identify those parameters that affect data quality and then be able to quantitatively assess the completeness of the seismic parameters that affect seismic quality in a particular database. It will not address aspects of data quality such as the completeness of individual traces within a line in a survey. It cannot address the more qualitative aspects of a survey such as how it looks or whether a particular horizon can be interpreted or not or whether artefacts have been introduced by processing.
Data formats
The contract should specify the format the survey data is to be supplied in (see list of formats) and the type of media (see list of media types) on which it is copied so that the buyer/licensee can check that it is compatible with its existing data intake flow. This avoids an extra data transcription delay if the data is provided in an incompatible format.
Acquisition parameters
Ideally the contract should state the:
- Seismic energy source and parameters
- gun pressures/volumes (for air guns used in offshore acquisition)
- Energy source depth
- charge weight/type for relevant source types
- Number of subarrays/sources
- Vibroseis parameters
- Receiver information
- Sample interval
- Near and far offsets
- Receiver types and manufacturers specifications
- Number of streamers, streamer length, streamer components and depths
- node geometry and
- Survey and positioning
- the survey data to be provided (e.g. field data /processed positional or navigation
tapes)
- the coordinate reference system used, ideally with the relevant EPSG codes.
- Positions of antenna/vessel reference point and offsets to SP/Receiver/CDP/Tail buoy
should be given. This ensures that the data is accurately located and can be used
without the need to amend the navigation.
- Water depth data should be provided with corrections for echo sounder depth/vessel
draft, stating the sound velocity in water and tidal corrections
For more information about survey and positional data, click here. (Spatial Data tab)
Reports often requested
The contract should specify which ancillary reports are to be supplied
- Field reports such as observer’s logs, driller logs, shooter logs, independent QC reports,
acquisition reports
- Raw or original survey locations (may be required by local regulators)
- Processing reports
- Velocity studies
- gravity/magnetic
- CSEM
- QC plots/digital images may be provided. These can help verify if the newly acquired data has
been loaded correctly.
Processing Summaries
Content will be here soon!
Licensed Rights and Entitlements
The contract should specify which products are being licensed (which versions of the processing), the record length being supplied for each (this might include intermediate products such as nav-merged raw data or gathers). Availability of stacking/migration velocities or velocity models should also be provided with the relevant data format. The year of processing of each product should be stated.
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