Services

We provide a comprehensive range of services tailored to our clients requirements. Project work can be undertaken on a single well or regional basis incorporating wireline and/or LWD datasets with integration of ancillary well data (core, petrography, NMR, PLT and geomechanical data). We aim to proactively engage with our clients in order to provide an efficient, timely interpretation customised to each individual project.

Data processing and quality control

Analysis can be undertaken on all commercially available borehole image tool types (wireline and LWD) from both water-based and oil-based mud environments.

A rigorous data QC process is undertaken in order to identify and, if necessary, correct potential issues with the supplied datasets.

Processing can be carried out using either Recall or Terrasciences software. Results from the QC review are plotted, sections of poor data quality are highlighted and results are discussed with the client prior to interpretation.

Structural interpretation

Structural interpretation of borehole images may include:

  • Identification of structural dip indicators, subdivision of the section into structural zones, determination of mean structural tilt by structural zone and analysis of structural zone boundaries.
  • Curvature analysis of soft sediment deformed and folded sequences in order to determine fold axis information and palaeoslope direction.
  • Identification of faults, determination of damage zone width, curvature analysis to determine fault strike (where faulting is inferred from dip patterns) and estimate of throw.
  • Fracture analysis including correction for borehole bias, calculation of fracture density per unit length, fracture set definition and spacing statistics.
  • Integration of fracture and fault results with ancillary datasets including production log results, mud losses, lithology/lithofacies relationships.
  • Identification of in-situ stress indicators and orientation of the present-day stress direction
  • A variety of displays are provided including vector walkout and cumulative dip magnitude plots, stereonets, rose histograms.

Sedimentological interpretation

Sedimentological interpretation of borehole images may include:

  • Removal of the background structural tilt from the manual dip dataset.
  • Identification of bounding surfaces and macroforms.
  • Recognition of angular unconformities.
  • Interactive picking of image lithofacies based on image character, open hole log response and manual dip patterns.
  • Generation of high resolution image lithofacies data which can be used to determine thickness statistics and net to gross.
  • Correlation with cored sections and core facies.
  • Upscaling of image lithofacies to gross depositional environment
  • Interpretation of palaeo-transport, sediment dispersal directions , palaeoslope strike directions and sand-body geometry.
  • Sand counts from images by automated or manual techniques which can be integrated with NMR data.

Hotshot and near real time LWD analysis

Our staff are available 24-7 for near real-time and quick-look interpretations on all of the services that we offer. In addition, near real-time evaluation of LWD borehole image data can be performed to determine bedding dip and fracture/fault occurrence, which can aid in near real-time geosteering or sidetrack positioning decisions.

Core description

A diverse set of information can be derived from slabbed, full and half-cut core.

  • Core data are captured in detail. Valid integration with other data sets including: open-hole logs, borehole images, core analysis and other auxiliary datasets.
  • Descriptive: unbiased and not model driven. Valid for evolving reservoir models.
  • Hand-drawn core logs portray the characteristics, stacking patterns and architecture of the cored succession.
  • Core sheets are tailored to reservoir type and client specifications.
  • Detailed fracture analysis includes: fracture count, type and morphology, fill, aperture, apparent timing and cross-cutting relationships

Core goniometry

Core goniometry can be undertaken on both oriented and unoriented core using one of two methods: the traditional acetate sleeve method and the 360° core photograph method. Both methods permit orientation of core and geological features visible in the core to provide a high resolution manual dip dataset that can be integrated with core logging, borehole image and petrographic interpretations.

Acetate sleeve core goniometry is carried out manually in the core store by wrapping acetate sheets around the core and by tracing geological features. Resulting acetate sheets are scanned, spliced and loaded into TerraStation software where they are referenced to the borehole deviation and azimuthally rotated to borehole image/dipmeter data as necessary. Manual dip picking of the traced and classified features is then undertaken. Sleeve goniometry can be performed on half-cut, three-quarter-cut and full core.

Significantly greater accuracy and detail can be captured from the 360° photograph goniometry method. Supplied 360° core photographs are loaded into TerraStation software where they are spliced, referenced to the borehole deviation and azimuthally rotated as per the traditional method. The photograph method is less time consuming, which means that core viewing room rental facilities are kept to a minimum, and most importantly, many more geological features can be identified and oriented with greater accuracy.

Petrography

BHICS staff have petrographic experience of clastic, carbonate, igneous and metamorphic rock types. All petrographic evaluation is undertaken on our Olympus microscope, which is fitted with a high resolution Canon digital camera system. We outsource our thin section preparation to
Independent Petrographic Services Ltd. where samples can be cleaned, stained and prepared at specified positions on the sample.

Petrographic evaluation of rock samples, core, sidewall cores and cuttings can be undertaken to provide:

  • Textural and compositional descriptions, point counts, photomicrographs and rock type classifications.
  • Cementation and diagenetic history of samples together with fracture relationships and fracture fill types.

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Contact BHICS

Structural Analysis

Wildcat Geoscience Ltd

Ann Murray

Sedimentological Analysis

Walker Geoscience Ltd

Deborah Walker

Prolog Geoscience Ltd

Marguerite Fleming