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Related Experiment Videos

Quantitative 1D saturation profiles on chalk by NMR

D Olsen1, S Topp, A Stensgaard

  • 1Geological Survey of Denmark, Copenhagen, Denmark.

Magnetic Resonance Imaging
|January 1, 1996
PubMed
Summary

Nuclear Magnetic Resonance (NMR) measurements reveal saturation gradients in chalk core samples after fluid flow. This technique aids in analyzing core floods and determining capillary pressure functions.

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Area of Science:

  • Petroleum Geoscience
  • Reservoir Engineering
  • Analytical Chemistry

Background:

  • Understanding fluid distribution in porous media is crucial for reservoir characterization.
  • Chalk formations present unique challenges in fluid flow analysis due to their complex pore structures.
  • Core flooding experiments are standard methods for simulating reservoir conditions.

Purpose of the Study:

  • To develop and apply a quantitative method for measuring one-dimensional saturation profiles in chalk core samples.
  • To investigate the presence and extent of saturation gradients during and after fluid flow.
  • To assess the utility of the developed method for analyzing core flood experiments and determining capillary pressure.

Main Methods:

  • Quantitative one-dimensional saturation profiles were obtained using Nuclear Magnetic Resonance (NMR) measurements.

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  • A 1D Chemical Shift Imaging (CSI) spectroscopy pulse sequence was employed for data acquisition.
  • Saturation profiles were measured under conditions of fluid flow through the chalk core samples.

    • Main Results:

    • Strong saturation gradients of water and oil were observed in chalk core samples post-core flood.
    • These saturation gradients are attributed to capillary effects within the porous chalk matrix.
    • The NMR-based method successfully provided detailed saturation distribution data.

    Conclusions:

    • The 1D CSI NMR technique provides quantitative saturation profiles in chalk core samples under dynamic flow conditions.
    • Significant capillary-induced saturation gradients are present in chalk cores after fluid injection.
    • This NMR method is a valuable tool for the analysis of core floods and the determination of capillary pressure functions in reservoir rocks.