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Development of pulsed neutron uranium logging instrument.
Xin-guang Wang1, Dan Liu2, Feng Zhang1
1School of Geosciences, China University of Petroleum, Qingdao 266580, People's Republic of China.
The Review of Scientific Instruments
|April 3, 2015
Summary
A new pulsed neutron instrument accurately measures uranium content using a uranium-bearing index derived from epithermal neutron detection. This method also determines formation porosity and thermal neutron lifetime.
Area of Science:
- Nuclear Geophysics
- Well Logging Technology
- Radiometric Assay
Background:
- Accurate in-situ uranium (U) quantification is crucial for resource exploration and environmental monitoring.
- Traditional methods often face challenges with complex geological formations and varying borehole conditions.
- Pulsed neutron logging offers a non-invasive approach for subsurface analysis.
Purpose of the Study:
- To develop and validate a novel pulsed neutron uranium logging instrument.
- To introduce a new uranium-bearing index for improved uranium content calculation.
- To assess the instrument's capability for simultaneous measurement of formation porosity and thermal neutron lifetime.
Main Methods:
- Development of a pulsed neutron logging instrument utilizing a D-T neutron generator and epithermal neutron detectors.
- Analysis of the temporal distribution of epithermal neutrons from (235)U thermal fission.
- Monte Carlo simulations and experimental calibration well studies to validate logging response.
Main Results:
- A linear correlation was established between the developed uranium-bearing index and the actual uranium content.
- The instrument demonstrated successful simultaneous acquisition of uranium content, formation porosity, and thermal neutron lifetime.
- Simulation and experimental data confirmed the reliability of the proposed method.
Conclusions:
- The developed pulsed neutron logging instrument provides an effective method for in-situ uranium quantification.
- The novel uranium-bearing index enhances the accuracy of uranium content determination in geological formations.
- This technology offers a versatile tool for comprehensive formation evaluation in the oil and gas industry.
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