Construct NMR Capillary Pressure Curves by Piecewise Power Function Based on T2 Cutoff Values

doi:10.11938/cjmr20182674

Abstract

Abstract: To some extent, pore throat structures of the rock can be characterized by NMR T₂ distribution and capillary pressure curve. Theoretical analysis showed that NMR T₂ distribution of a rock could potentially be used to derive its capillary pressure curve, providing a quick and non-destructive way to obtain the pore structure distribution data of the reservoir. In this study, the capillary pressure curves of typical cores were constructed from nuclear magnetic resonance (NMR) T₂ distributions using a piecewise power function method. T₂ cutoff values were introduced as piecewise points for the power function. Then the capillary pressure curves constructed with the piecewise power function method and those constructed with the non-piecewise power function method were compared. The results showed that the proposed method had improved precision, with an averaged fitting degree of 0.943 1. Introducing of T₂ cutoff values was proven to be useful in constructing NMR capillary curves by the piecewise power function method.

Key words: low-field NMR, capillary pressure curve, T₂ cutoff value, pore structure

CLC Number:

O482.53

LIU Zhuo, OU-YANG Chuan-xiang, WANG Chang-quan, HAN Deng-lin, WU Qiong, GAO Xing. Construct NMR Capillary Pressure Curves by Piecewise Power Function Based on T₂ Cutoff Values[J]. Chinese Journal of Magnetic Resonance, 2019, 36(1): 45-54.

References

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Construct NMR Capillary Pressure Curves by Piecewise Power Function Based on T₂ Cutoff Values

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