Data processing and quality control

The tools that provide borehole images are technically complex, many relying on the Earth’s magnetic and gravitational fields to derive orientation data integral to further analysis. The correct functioning of fundamental systems in the tools must be confirmed (or erroneous data corrected) in order to provide confidence in the overall interpretation. In many ways this initial processing and quality control of data received by Task Geoscience is the most important step in our analysis process, as it is the foundation upon which the entire interpretation is built. Thorough checks are undertaken in order to ensure the data is fit for purpose, as outlined below. In addition, the image parameters are adjusted to maximise the clarity of geological features.

Data loading

• Data can be loaded from a variety of formats, including DLIS, LAS, LIS, ASCII, etc. We work closely with our software providers to allow unusual formats to be loaded. Loading procedures vary with tool type and service company provider.

Data quality control (QC)

• Ensure all required data is present; check for any problems noted during logging.
• QC of tool orientation and behaviour during logging.
• Comparison of borehole trajectory as calculated by the tool and by independent geographical survey.
• Correction of images for tool sticks and tool pulls.
• Depth matching of image to open-hole reference log suite where applicable.
• Image polarity.
• Hole condition.
• Verification against any overlapping image runs.

Further information to client

• Identification of good versus poor quality intervals within the borehole image. Clients may choose to adjust study intervals based on this information, providing savings in both time and money. Task Geoscience can also review data and advise clients as to whether quality warrants proceeding with a full analysis.
• Identification of image artefacts that may degrade overall quality.
• Systematic variations in borehole cross-section.

Flexibility

• Task Geoscience uses both Terrastation and Recall software to process image data. The two packages provide us with a choice of tools to process data, choosing the best result for further analysis.
• Graphical manipulation of images to enhance visualisation of geological features.
• Dedicated, client-specific file transfer (FTP) areas are available for data delivery and receipt via the internet. Optional encryption processes for extra security.

Requirements

• Task Geoscience can work with most data. However, well organised file structures with meaningful and standardised file and log curve names, allow us to most efficiently access, load and assess supplied data. This ensures the client receives the best possible interpretation in the shortest timeframe.

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