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Related Experiment Videos

Comparative measurements between a new logging tool and a reference instrument

M Locatelli1, H Mathieu, S Bobroff

  • 1LETI (CEA Technologies Avancées), Grenoble, France.

Magnetic Resonance Imaging
|November 6, 1998
PubMed
Summary
This summary is machine-generated.

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A new logging tool offers high spatial resolution for nuclear magnetic resonance (NMR) measurements. It shows significant T2 differences compared to clinical MRI, impacting porosity evaluation in heterogeneous rocks.

Area of Science:

  • Geophysics
  • Petrophysics
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Accurate porosity measurement is crucial for understanding rock properties.
  • Conventional methods may lack the spatial resolution needed for heterogeneous samples.
  • Nuclear Magnetic Resonance (NMR) offers a non-invasive method for fluid and porosity analysis.

Purpose of the Study:

  • To evaluate a novel NMR logging tool with high spatial resolution.
  • To compare its performance against clinical Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) scanners.
  • To assess the tool's accuracy in determining porosity profiles of heterogeneous rock samples.

Main Methods:

  • Measurements were conducted on deuterium oxide-water (D2O-H2O) reference mixtures and Vosges sandstone.

Related Experiment Videos

  • A new NMR logging tool with a 1.5 cm vertical resolution and 20 cm³ sensitive volume was utilized.
  • Results were compared with data from a clinical MRI (4.3 MHz) and a CT scanner.

    • Main Results:

    • The new logging tool achieved high spatial resolution, below 1.5 cm.
    • T2 relaxation time differences up to 30% were observed between the logging tool and clinical MRI.
    • Both NMR methods underestimated porosity by 2-4% for short T2 values (< 10 ms).

    Conclusions:

    • The new NMR logging tool provides high spatial resolution for petrophysical analysis.
    • Observed T2 differences highlight the impact of tool design on measurement outcomes.
    • The underestimation of porosity for short T2 values is a critical consideration for NMR-based porosity evaluation.