Upstream Exploration and Production with the Thermo Scientific Niton XL3t 900 GOLDD Series XRF Analyzer

Significance of the Topic

The ability to perform onsite bulk chemical analysis of rock samples accelerates decision making in upstream exploration and production by identifying mineralogy and reservoir properties in real time.
This approach supports formation identification, informs on porosity, permeability, and fracture propensity, and reduces reliance on centralized laboratory analysis, lowering costs and increasing data resolution at the centimeter scale.

Objectives and Study Overview

This study evaluates the performance of the handheld Thermo Scientific Niton XL3t 900 GOLDD Series XRF analyzer for upstream exploration and production tasks.
It investigates the analyzer’s capacity to measure major, minor, and trace elements in drill cuttings, cores, outcrops, and piston-cored sediments, and compares results with laboratory ICP-MS references.
Case studies in the Eagle Ford and Montney formations demonstrate chemostratigraphic logging at the centimeter scale to delineate productive intervals in shale and tight reservoirs.

Methodology

One hundred sixty sedimentary rock samples and standards were prepared as pressed powder pellets and analyzed with the handheld XRF using a helium purge to enhance light element detection.
Measurements comprised 30 s on low, main, and high energy filters for elements Ti to U, and 60 s on the light filter for Mg to S, totaling 150 s per sample.
Data were benchmarked against ICP-MS, yielding R² > 0.90 and repeatability < 5 % RSD for elements from Mg to U.
Field tests on solid cores and drill cuttings demonstrated data quality within 5–20 % of laboratory values.

Instrumentation Used

Handheld Thermo Scientific Niton XL3t 900 GOLDD Series XRF analyzer with geometrically optimized large area drift detector (GOLDD) technology.
Helium purge accessory for optimal analysis of light elements (Mg–S).
Low, main, high energy, and light filters for segmented elemental detection.

Key Results and Discussion

Strong correlation with laboratory data confirmed via R² > 0.90 and repeatability < 5 % for most elements.
In the Eagle Ford case, Mn, V, Cr, and Mo logs successfully identified the Turonian/Cenomanian boundary and correlated with total organic carbon variations.
Montney formation studies used elemental abundance and ratio plots (Fe versus S; Si/Al; Ca/K) to distinguish pyrite, calcite cement, quartz, and clays, providing proxies for porosity and gas storage potential.
Consistent sample preparation and measurement conditions allowed elemental ratios to serve as robust mineralogical indicators.

Benefits and Practical Applications

Rapid onsite elemental analysis supports real-time assessment of rock properties relevant to porosity (Si, Ca content), permeability (clay and cement proxies), and fracture potential (quartz content).
Chemostratigraphic logging enhances stratigraphic correlation in monotonous shale sequences and pinpoints productive intervals.
Deployment of handheld XRF reduces laboratory turnaround and costs while increasing data density at the rig site.

Future Trends and Opportunities

Integration of handheld XRF data with petrophysical logs and machine learning workflows for predictive reservoir modeling.
Broader adoption of chemostratigraphic techniques in diverse unconventional plays worldwide.
Advancement of calibration protocols and sample preparation methods to further improve light element and trace metal detection limits.

Conclusion

The Thermo Scientific Niton XL3t 900 GOLDD Series handheld XRF analyzer delivers high-quality, in situ elemental data that aligns closely with laboratory standards, enabling timely and informed decisions in upstream exploration and production.
Its versatility across sample types and strong analytical performance enhance well logging, core analysis, and formation evaluation workflows, driving cost savings and operational efficiency.

References

• Sageman BB, Murphy AE, Werne JP, Ver Straeten CA, Hollander DJ, Lyons TW. 2003. A tale of shales: the relative roles of production, decomposition, and dilution in the accumulation of organic-rich strata, Middle–Upper Devonian, Appalachian basin. Chemical Geology, 195:229–273.
• Ross DJK, Bustin RM. 2009a. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs. Marine and Petroleum Geology, 26:916–927.
• Ross DJK, Bustin RM. 2009b. Investigating the use of sedimentary geochemical proxies for paleoenvironment interpretation of thermally mature organic-rich strata: Examples from the Devonian–Mississippian shales, Western Canadian Sedimentary Basin. Chemical Geology, 260:1–19.