Factors Affecting NMR T2 Spectra of Oil Well Samples and Methods for Determining the T2 Cutoff Value

Abstract

Abstract:

Well-logging and mud-logging using nuclear magnetic resonance (NMR) technology are based on evaluation and interpretation of T₂ spectrum measured from the rock samples excavated from potential oil wells. Many factors may affect the T₂ spectrum of the rock samples, including technical parameters used in measurement, physical/chemical properties of the rock samples (i.e., lithology, particle size, granularity, dry or wet, composite and properties of pore-fluid, magnetic susceptibility, wettability and so on), degree of mineralization of formation water etc. The most important parameter relevant to logging that is obtainable from the T₂ spectra is the T₂ cutoff value, whose accurate determination influences greatly the meaning of the results of NMR measurements. In this paper, we reviewed the factors affecting T₂ spectra of oil well samples and the current methods for determining T₂ cutoff value.

Key words: NMR, T₂ spectrum, logging, degree of mineralization, T₂ cutoff value

CLC Number:

TE122.2

WANG Zhi-Zhan, Deng-Mei-Yin, Zaii-Shen-De, Zhou-Li-Fa. Factors Affecting NMR T₂ Spectra of Oil Well Samples and Methods for Determining the T₂ Cutoff Value[J]. Chinese Journal of Magnetic Resonance, 2006, 23(1): 143-151.

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Factors Affecting NMR T₂ Spectra of Oil Well Samples and Methods for Determining the T₂ Cutoff Value

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