Recent new capability
Elemental Analysis and Chemostratigraphy Services
Ellington & Associates, Inc. and Chemostrat Inc. have formed and alliance to provide elemental analysis and chemostratigraphy from a base in Houston, Texas.
The Houston based lab is the first commercial XRF elemental service based in the U.S.
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Petrographic and Lithological Analysis and Interpretation
Sedimentological descriptions and interpretations of cores, petrographic studies of thin sections, and descriptions of cuttings are tailored to the specific needs of our clients allowing more appropriate integration into their geologic models.
Based on the needs of the client, point-counting during the description of thin section can focus on total composition, framework, porosity or grain size. The minimum number of points counted is 250. Photomicrographs and digital images are always available.
This data and data from other sources such as the Scanning Electron Microscope (SEM), X-ray diffraction (XRD), log suites and measured porosity and permeability, well files, and regional reports can be integrated into a comprehensive report. This report and the corresponding data are stored in a format based on client preference and software capability.
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"%" Sand Fraction Analysis
 Determines sand/shale percentages
 Is a quantifiable technique rather than a subjective process
Correlates a sample depth log with other logs
Insures against logging tool or wireline failures
Is generated and available prior to running wireline logs
Can be derived from stored cuttings whenever needed
Aids in the determination of the volume of shale (Vsh)
Provides resolution of sand development in laminated sequences
Determines rock properties directly rather than indirectly
Aids the paleontologist in quantitative fauna abundance
determinations
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The sand log directly measures the "percent sand" content from ditch cuttings or cores utilizing direct rock properties. The removal of shales and clays using disaggregation techniques employed in foraminifera isolation procedures generates a sand fraction. The sand fraction contains rock particles ranging in size from very fine sand (106 microns) to coarse sand (850 microns) and consists of siliceous and calcareous grains, glauconite, pyrite, and other rock material. The processed sample weight is then compared to the original weight of the cleaned cuttings to calculate the percent sand.
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Thin Section Preparation and Analysis *
In evaluating mineralogical properties, thin section analysis provides a detailed description of the sample including the framework, porosity, and grain size.
Standard preparation includes impregnation of the sample and a final lapped thickness of 30 microns with a 600 grit finish. Clients can choose impregnation with clear, blue or fluorescent dye "spiked" epoxy. Options, such as polishing or staining for feldspars and carbonates, are available upon request.
* The above services and pictures are provided courtesy of our association with TPS Enterprises, Inc.
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