Sedimentological core logging

Task Geoscience provide a comprehensive core logging service. Core logging programmes can be adapted and designed to meet client needs and to target specific questions regarding the succession.

Core logging

• Siliciclastic, carbonate, evaporitic and mixed environments.
• Logged on a range of scales, from high resolution at 1:25 to summary logs at 1:200.
• High-quality detailed digital graphical product.
• Core integrated with borehole images, core analysis data and open-hole logs.
• Logged at global locations.
• We have specialist sedimentologists with expertise in fluvial, mixed fluvial and aeolian, shallow-marine siliciclastic, deep-marine siliciclastic and carbonate environments.
• Sedimentological core logs can be integrated with other services, such as goniometry, structural logs and borehole image analysis.

Standard logged features

• Lithology.
• Grain size and grain size trends.
• Visual assessment of clay content.
• Sedimentary structures – depositional structures and those caused by syn-sedimentary deformation.
• Granular components and bioclast abundances and types.
• Bed boundary types.
• Key candidate sequence stratigraphic surfaces.
• Macrodiagenetic features evident in core (nodules, doggers, cements).
• Faults, fractures, induced features and apparent dip.
• Bioturbation index and ichnofabrics.
• Hydrocarbon staining.
• Visible porosity estimates.
• Degree of cementation.
• Bed thicknesses.
• Core disking, core preservation and rubble zones.
• Details of core sample sites.
• Lithofacies types and facies associations.
• Key features and facies types photographed.

Standard presentation

• Graphical log.
• Integration with core analysis results.
• Core images.
• Scanned external surface images (see the poster (new window/tab)).
• Comparison to borehole images and open-hole logs.

Interpretation

• Facies and facies association analysis.
• Depositional environment inferred.
• Provision of training set for core to borehole image log calibration.
• Integration with goniometry data, results from borehole image analysis and biostratigraphical results.
• Integration with sediment dispersal data.
• Petrographcal analyses tied with the depositional environment.
• Summary core analysis statistics derived for each lithofacies type.
• Ichnofacies analysis.
• Bed thickness statistics.
• Prediction of bed geometries.
• Inter-well correlation.
• Integration with structural history.

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