波谱学杂志2025，Vol.42Issue(3)：275-284,10.DOI:10.11938/cjmr20243138
页岩核磁共振孔隙度精确测定实验研究
Experimental Study on Accurate Determination of Shale Porosity by Nuclear Magnetic Resonance
摘要
Abstract
In recent years,the exploration and development of shale oil and gas have expanded significantly,accompanied by numerous challenges.Porosity is a fundamental parameter for shale reservoir evaluation and reserve estimation,providing essential data for determining sweet spots and formulating development plans.Low-field nuclear magnetic resonance(LF-NMR)technology has unique non-invasive,non-destructive characteristics and has become a crucial method for shale porosity measurement.However,shale has substantially different nuclear magnetic resonance(NMR)response mechanisms from that of conventional sandstone and carbonate reservoir rocks.Furthermore,improper experimental parameters or inversion process can lead to errors or even faults in the measurement of shale porosity by NMR.In this paper,Ti-T2 correlation is adopted to qualitatively identify hydrogen-containing components in dry and saturated shale.Based on the principle that NMR signal is proportional to the number of spin protons under uniform static magnetic field and constant temperature field,an experimental method is proposed to directly measure the shale porosity.This method calibrates with standard water sample,then compares the first amplitude of the NMR free induction decay(FID)signal between water-saturated and dry shale.The experimental results show that the NMR porosity obtained through this method is in good agreement with the weight porosity,and the influence of background signal from hydrogen-containing matrix components in shale is eliminated.关键词
有机质/页岩/核磁共振/岩石物理/孔隙度测定Key words
organic matter/shale/nuclear magnetic resonance(NMR)/petrophysics/porosity determination分类
天文与地球科学引用本文复制引用
杜群杰..页岩核磁共振孔隙度精确测定实验研究[J].波谱学杂志,2025,42(3):275-284,10.基金项目
国家自然科学基金资助项目(42474156). （42474156）
