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Consultancy and Analytical Services Offered
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Via Jennifer Huggett, Petroclays offers a high level of expertise in clastic
geology, applied particularly to: |
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- shale petrology
- understanding
the controls of clastic reservoir quality
- understanding
the causes of reservoir damage caused by drilling or production
- understanding
the causes of reactive shales and predicting their distribution
- quantifying
mineralogy using X-ray diffraction and microscopy
- quantifying
primary, secondary and micro porosity using microscopy
- quantifying
swelling clay and other problem minerals for geotechnical studies
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Analytical Techniques Employed
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X-Ray Diffraction Analysis (XRD) |
- Preparation and scanning of oriented clay mounts (<2µm or <4µm) and powders (for whole rock analysis)
- Provision of annotated traces
- Full interpretation of the traces, and semi-quantitative estimation of mineral percentages
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Instrumentation
The samples are analysed with a fully automated Phillips 1820 X-ray diffractometer, using Cu Ka radiation and a variable slit system.
Clay samples are generally scanned untreated (2-40° 2Ø), glycolated (2-26° 2Ø), and heated (400°C and 550°C).
Whole rock powders are scanned from 2-70 2Ø. Scanning is normally at a rate of 0.02°/ minute.
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Click the image below for an example of XRD analysis
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More about XRD
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Comprehensive mineralogical analysis and diagenetic interpretation of samples (outcrop, core, sidewall core or cuttings). The degree of detail and the emphasis being dependent upon the client's requirements.
Petroclays offers expertise in clastics, including volcaniclastics. Work can also be carried out on limestones.
The optical microscopy service includes: |
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Thin section preparation to a very high standard, using either clear or blue dyed epoxy resin.
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Selective mineral staining for carbonates and feldspars.
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Illustration by annotated digital images.
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Detailed thin section analysis with lithological and textural analysis, description of authigenic and detrital minerals including any potential formation damage hazards, quantification (point counting to 300 using a modified version of the ExxonMobil classification), interpretation of diagenetic history, pore types and assessment of porosity/permeability characteristics.
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Instrumentation
Olympus BX41 optical microscope with Swift automatic point counter and Q Imaging image capture. |
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Click on image for an example of optical microscopy images  |
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Click on image for an example of SEM images  |
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Fracture surface, secondary electron imaging, the 'conventional' mode of SEM, is used for examining grain and cement textures. Semi-quantitative energy dispersive X-ray analyses can be obtained for individual particles larger than 1-2 µm
Click for more on
Fracture Surface Secondary Electronic Imaging
Back-Scattered Electron Microscopy (BSEM) is used for petrographic study and can be used to study the mineralogy, textures and fabric in fine grained rocks such as mudstones as well as in coarser grained rocks. BSEM petrography has an additional advantage over light microscopy in that if the SEM has an X-ray analysis facility then qualitative or quantitative analyses of the mineral components can be obtained.
Other successful industrial applications of BSEM include the study of scales and corrosion products.
Click for more on
Back-Scatterd Electron Microscopy
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Click on image for an example of BSEM images  |
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Instrumentation
The Scanning Electron Microscopes used are a Zeiss EVO (for high quality chemical analysis), aZeiss Ultra Plus (for high resolution imaging and quantitative analysis) and a LEO 1455VP for routine analysis. All three instruments are fitted with Oxford Instruments INCA x-ray analytical softwatre.
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Petroclays can also arrange to provide |
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transmission electron microscopy
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cathodluminescence
microscopy
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EELs
analysis
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oxygen
and carbon stable isotope analysis
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K/Ar
age dating
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ICP-AES
chemical analysis
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XRF
chemical analysis
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Where third parties are used, these are always highly reputable suppliers. |
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