Geochemical Spectroscopy Tool
Enables quantification of mineralogy, lithology, and organic carbon for improved saturations and reservoir characterization
- Mineralogical quantification, including clay types
- Detailed lithological analysis
- Matrix density and matrix-corrected porosity
- Enhanced porosity and oil saturation calculation
- Total organic carbon (TOC) determination
- Formation sigma
Features and Benefits
- The geochemical spectroscopy instrument (GSI) functions as an integrated answer product that generates mineralogy and detailed lithology.
- The service combines 15 elements: 12 from the GSI (Al, Ca,C, Cl, Gd, H, Fe, Mg, O, Si, S, Ti) with three from spectral gamma ray (K, Th, and U) for complete mineralogy determination.
- Diffusion-corrected sigma aids in formation evaluation and reservoir characterization.
- Real-time lithology and elemental concentrations are available at the wellsite, which enables time-sensitive decision-making.
- A 14 MeV pulsed-neutron generator provides for comprehensive inelastic and capture gamma ray detection.
- No chemical radioactive source is required, which enhances safety in the case of a fishing incident or lost-in-hole event.
- The lanthanum bromide (LaBr3) detector exhibits enhanced energy resolution with fast emission and temperature linearity characteristics.
- The instrument can be deployed using advanced Assure™ conveyance techniques.
- Memory capabilities enable cost-effective horizontal logging.
The geochemical spectroscopy instrument (GSI) uses a pulsed-neutron generator to induce inelastic and capture gamma rays. Measuring the gamma rays enables identifying key formation elements. The final lithological and mineralogical interpretation is guided by these elemental concentrations, as well as by the measurement of intrinsic sigma. The interpretation software processes the input, analyzes the lithology, and improves the identification of matrix properties for use in further reservoir characterization.
The tool is offered solely as a limited release, with no guarantees of availability or deployment in all locations, for the purposes of research, development, and experimentation. Weatherford does not warrant or represent that the tool will provide all desired functionality or will meet the requirements of a particular customer application.
18 in. (457 mm)
DOI inelastic events
8.5 in. (216 mm)
DOI capture events
10.5 in. (267 mm)
Measurement energy range
0.6 to 9 MeV
Ca, Cl, Fe, Gd, H, Mg, S, Si, Ti
Al, C, Ca, Fe, Mg, O, Si
All elements (GSI + SGR)
Al, C, Ca, Cl, Fe, Gd, H, K, Mg, O, S, Si, Th, Ti, U
3.25 in. (83 mm)
11.5 ft (3.5 m)
15,000 psi (103 MPa)
Maximum hole size
24 in. (610 mm)
Minimum hole size
3.75 in. (95 mm)
14 MeV pulsed-neutron generator
Elemental concentrations including Al, Ca, C, Fe, Gd, K*, Mg, S, Si, Th*, Ti, U*
Qualitative elements (H, Cl, O)
Formation mineralogy (in dry weights and volumes)
Detailed lithology (lithofacies)
Clay types and volumes
Integrated answer products
*Th, U, and K come from the spectral gamma ray.
The geochemical spectroscopy instrument is used in a Weatherford service that measures 15 elements to provide real-time lithology and elemental concentrations. The instrument can be deployed using advanced Assure conveyance techniques.
Reach out to optimize reservoir performance
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