Measurement of Permeability of Porous Rock Using NMR T2 Relaxation Distribution

Abstract

Abstract:

The calculation methods for permeability of porous rock from its NMR T₂ relaxation distribution are introduced. There are three available models (i.e., SDR, Coates-cutoff and Coates-sbvi model). The Coates-cutoff model and Coates-sbvi model are very sensitive to the precision of irreducible fluid model, and thus the permeability results calculated by these two models are strongly affected by the precision of moveable/irreducible fluid volume calculation. On the other hand, the SDR model is not affected by irreducible fluid model, but it is sensitive to the property of the fluid in the core’s pores. Because there is only one variable coefficient in these models, the calculation errors are large when the permeability is very low. We found that the SDR-REV model, developed recently with three variable coefficients, is much suitable for calculating permeability of the core samples with lower permeability.

Key words: NMR, T₂ relaxation, well-logging, rock’s experiment, porosity, permeability, model fitting

CLC Number:

TE135⁺.1

PENG SHI-Lin, YE Chao-Hui, LIU Mai-Li-. Measurement of Permeability of Porous Rock Using NMR T₂ Relaxation Distribution[J]. Chinese Journal of Magnetic Resonance, 2006, 23(2): 271-282.

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Measurement of Permeability of Porous Rock Using NMR T₂ Relaxation Distribution

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