1887

Abstract

Summary

The effect of NMR responses influenced by the echo spacing (TE) is significant when applied to unconventional reservoirs such as shale. It is hard to achieve the precious porosity in downhole NMR measurement due to the long TE compared to the laboratory experiment. We develop a practical method to compensate the influence of TE on the transversal relaxation time (T) spectrum of shale. Based on the experiments with different TE, the relationship between the NMR calibrated porosity and the TE is established to recover the amplitude. The effect of TE on the peak position is investigated and then an empirical equation is constructed to move the peak position to its original state. By the above two-step correction algorithm, the T spectrum of shale at large TE are compensated precisely. This method provides an effective way to obtain the real T spectrum, which is hopeful to apply to the downhole NMR data processing in shale reservoir.

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/content/papers/10.3997/2214-4609.201901642
2019-06-03
2024-03-28
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References

  1. REZAEE, Reza, SAEEDI, Ali, CLENNELL, & Ben
    .[2012]. Tight gas sands permeability estimation from mercury injection capillary pressure and nuclear magnetic resonance data. Journal of Petroleum Science & Engineering, 88–89(2), 92–99.
    [Google Scholar]
  2. Xiao, L., Liao, G., Deng, F., Liu, H., Song, G., & Li, M.
    . [2015]. Development of an nmr system for down-hole porous rocks. Microporous & Mesoporous Materials, 205, 16–20.
    [Google Scholar]
  3. Fantazzini, P., & Brown, R. J
    . [2005]. Initially linear echo-spacing dependence of 1/T2 measurements in many porous media with pore-scale inhomogeneous fields. Journal of Magnetic Resonance, 177(2), 228–235.
    [Google Scholar]
  4. McDowell, B. P
    . [2018]. Application of a Custom-Built, 400MHz NMR Probe on Eagle Ford Shale Core Plug Samples, Gonzales and La Salle Counties, Texas (Doctoral dissertation, Colorado School of Mines. Arthur Lakes Library).
    [Google Scholar]
  5. Xu, H., Tang, D., Zhao, J., & Li, S.
    [2015]. A precise measurement method for shale porosity with low-field nuclear magnetic resonance: A case study of the Carboniferous–Permian strata in the Linxing area, eastern Ordos Basin, China. Fuel, 143, 47–54.
    [Google Scholar]
  6. Sun, Z., Xiao, L., Zhang, Y., Liao, G., Xiang, W., Tang, L., ... & Hou, X.
    [2018]. A modular and multi-functional single-sided NMR sensor. Microporous and Mesoporous Materials, 269, 175–179.
    [Google Scholar]
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