Effects of Echo Time on NMR Apparent Porosity and Correction Methods

doi:10.11938/cjmr20192771

Abstract

Abstract: In order to study the effect of echo time (T_E) on nuclear magnetic resonance (NMR) porosity in tight oil (gas) and shale reservoir, multi-T_E NMR experiments and NMR numerical simulations were performed on CuSO₄ solutions with specific transversal relaxation time (T₂). The results showed that the normalization NMR porosity of different T₂ relaxation components remained 100% in the low T_E region, and rapidly decreased with increasing T_E. When T_E was greater than certain value, the normalization NMR porosity dropped to zero. However, the T_E value at which the normalization NMR porosity began to decrease and the T_E value at which the normalization NMR porosity dropped to zero were different for different NMR relaxation component. Moreover, the whole NMR measurement was divided into lossless zone, fast decay zone, invalid parameter zone and instrument blind zone, based on the relationships between the normalization NMR porosity of different relaxation component and T_E. For each specific relaxation component, a logarithmic relationship was demonstrated between the loss of relaxation component and T_E in the fast decay zone. A method for NMR porosity correction was given.

Key words: nuclear magnetic resonance (NMR), echo time, NMR porosity, component loss, numerical simulation

CLC Number:

O482.53

ZHANG Gong, HE Zong-bin, CAO Wen-qian, CHEN Yao. Effects of Echo Time on NMR Apparent Porosity and Correction Methods[J]. Chinese Journal of Magnetic Resonance, 2020, 37(2): 172-181.

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