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A potential NMR-based wettability index using free induction decay for rocks

Magnetic Resonance Letters 2023年第3期3卷 266-275,I0004页

作者： Can Liang Zijian Jia Lizhi Xiao Guwen Wang Yan Mao Xiaopeng Ma Changzhou Institute of Technology Changzhou213032China University of Shanghai for Science and Technology Shanghai200093China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China

The wettability of reservoir rocks saturated with oil and water is one of the most important factors influencing petrophysics and oil *** with different wettability constitute the overall heterogeneous wettability in *** in sample composi-tion can be detected by nuclear magnetic resonance(NMR)*** this paper,the method of using the magnetic susceptibility contrast between rock skeleton and saturated fluid to estimate wettability is *** theoretical feasibility was firstly analyzed,and then the internal gradients caused by magnetic susceptibility contrasts were employed to interpret wettability alteration before and after ageing process in *** was discovered that water and oil in the same pores experienced different internal gradients after ageing,which were associated with the differences in magnetic susceptibility *** that,the free induction decay measurement was performed to acquire mag-netic susceptibility contrasts of artificial sandstone samples with the intermediate-wet condition.A refined NMR wettability index was presented and correlated with the Amott wettability *** experimental results demonstrate that the new method for deter-mining wettability is feasible.

关键词： NMR Wettability characterization Magnetic susceptibility contrast internal gradients

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