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Study of a novel density well-logging tool using A position-sensitive detector.

Fafu Niu1, Zhiyi Liu2, Dugan O'Neil1

  • 1Department of Physics, Simon Fraser University, Burnaby, V5A1S6, Canada.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|August 24, 2019
PubMed
Summary

This study introduces an innovative density well-logging tool using a position-sensitive detector (PSD) to improve measurements in thin-bedded rocks. The new tool demonstrates superior accuracy for thin layers, enhancing subsurface formation evaluation.

Keywords:
Density logging toolMonte Carlo simulationPosition-sensitive detectorVertical resolution

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Area of Science:

  • Geophysics
  • Petroleum Engineering
  • Nuclear Instrumentation

Background:

  • Density well-logging tools are crucial for subsurface formation analysis in the petroleum industry.
  • Traditional tools face limitations in vertical resolution and accuracy, especially in thin-bedded sedimentary rocks.
  • Improving measurement precision in these challenging formations is essential for accurate resource evaluation.

Purpose of the Study:

  • To propose and validate an innovative density well-logging tool utilizing a position-sensitive detector (PSD).
  • To enhance the vertical resolution and accuracy of density measurements in thin-bedded sedimentary rocks.
  • To demonstrate the feasibility of using PSD technology for improved subsurface formation density evaluation.

Main Methods:

  • Monte Carlo simulations using GEANT4 to model PSD performance with NaI(Tl) crystal.
  • Characterization of gamma-ray deposited energy and interaction position determination via photoelectron yield.
  • Development of a Monte Carlo model for the density well-logging tool incorporating the PSD.
  • Simulation of the tool's response in a geologic model of thin-bedded strata.

Main Results:

  • The PSD demonstrated energy and position resolutions of 19.0% and 1.3 cm, respectively, at 100 keV gamma-ray energy.
  • The proposed PSD-based density tool achieved good density evaluation for 5 cm thick layers.
  • Performance significantly surpassed traditional tools, which require thicker layers (16 cm) for comparable evaluation.

Conclusions:

  • The study confirms the theoretical feasibility of employing a position-sensitive detector in density well-logging tools.
  • The innovative tool shows significant promise for accurate density measurements in thin-bedded strata.
  • This advancement offers improved subsurface formation analysis capabilities in challenging geological environments.