Halliburton’s GEM™ Elemental Analysis Tool offers quick and precise evaluations of complex mineralogies using proven interpretation processes and integrated petrophysical analysis. A neutron-induced capture gamma ray spectroscopy logging system, it is designed to derive elemental contributions contained within the total measured gamma ray energy spectrum.

The GEM tool can measure elemental yields that are important to mineralogical evaluations in open holes to accurately assess the reservoir and complete the well. The logging software calculates elemental concentration logs using an oxides closure methodology which can be used for quick-look or detailed mineralogical evaluations.

These elemental concentrations can be used to identify geochemical stratigraphic correlations from well-to-well. Elemental concentrations can also be used to calculate matrix grain density and thermal neutron absorption (sigma) properties. The GEM tool uses a chemical source to promote wider application due to cost savings associated with its durability, shorter length, and simple usage requirements. The detector is enclosed in a flask with a eutectic heat sink to allow extended operation at downhole conditions. In addition, the software provides onsite or remote visualizations of the resulting data quickly and accurately, with proven robust post-processing solutions.

Benefits

• Improves accuracy of integrated petrophysical analysis
• Mineral fractions such as gypsum or anhydrite, carbonate, coal, pyrite, salt, siderite, quartz, feldspar, mica and clay from complex formation analyses
• Matrix density values for more accurate porosity calculation
• Sigma matrix for cased and open-hole sigma saturation analysis and improved neutron porosity environmental corrections
• Improves permeability estimates based on mineralogy
• Quick cool-down of eutectic heat sink for rapid job turnaround
• Borehole shielding for reduced sensitivity to borehole fluids