基于核磁冻融技术的煤的孔隙测试研究

doi:10.11743/ogg20160120

Abstract

Abstract: This study compared measurement results of total pore volume and pore size distribution of 6 coal samples with different coal ranks by using the Nuclear Magnetic Resonance Cryoporometry (NMRC) and low-temperature nitrogen adsorption BJH method.Meanwhile,the possibility and feasibility of applying NMRC to analysis of coal pore size distribution were evaluated for the first time. Results show that the total pore volume measured by NMRC is significantly larger than that of BJH method for the same coal sample.This is mainly caused by two factors. Firstly,in comparison with the BJH method,the NMRC can measure more closed pores.Secondly,the BJH model itself has some limitations in calculating the pore volumes of most micropores (<10 nm) and some meso-and macro-pores.Measurement results of coal samples with different coal ranks indicate that the total pore volume measured by NMRC shows a trend of decrease followed by an increase with increasing coal rank.This trend is consistent with the trend of the change of coal porosity with increasing coal rank.In contrast,the total pore volume measured by BJH does not match the trend of the change of coal porosity with increasing coal rank,due to the existence of outlier values in the measurement results of BJH method.Compared with the conventional methods,the NMRC has advantages in quantifying coal total porosity.Moreover,the results of NMRC are less influenced by some artificial factors.Thus,NMRC is a new method that can be applied to the measurement of pore structure of unconventional reservoirs.

Key words: Nuclear Magnetic Resonance Cryoporometry(NMRC), low-temperature nitrogen gas adsorption, pore structure, closed pore, coal

CLC Number:

TE132.2

Guo Wei, Yao Yanbin, Liu Dameng, Sun Xiaoxiao, Gao Yangwen. Research on measurement of pores in coals with NMRC technique[J]. Oil & Gas Geology, 2016, 37(1): 141-148.

References

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Research on measurement of pores in coals with NMRC technique

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