Petroleum Reservoir Evaluation and Development >
2025 , Vol. 15 >Issue 1: 73 - 78
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.01.009
Study on the influence of shale oil saturation on imbibition recovery rate
Received date: 2024-07-19
Online published: 2025-01-26
To investigate the influence of shale oil with different oil saturation on imbibition recovery rate, shale samples from the Jiangling sag in the Jianghan Basin were taken as the research object. Imbibition experiments were conducted to examine the variation of core imbibition curves at oil saturation of 20%, 30%, 40%, and 50% under conditions of similar and increasing permeability. Nuclear magnetic resonance (NMR) technology was used to analyze the changes in oil-phase signals within the core pores before and after imbibition. Additionally, the imbibition volume and oil displacement volume during the imbibition process were compared. The results showed that under similar permeability conditions, cores with higher oil saturation exhibited higher imbibition recovery rates. In contrast, cores with higher oil saturation had slower imbibition rates at the initial stage of imbibition and required a longer time to reach imbibition equilibrium. When permeability gradually increased, cores with higher oil saturation achieved higher imbibition recovery rates. In this case, cores with higher oil saturation also exhibited faster imbibition rates in the early stages compared to those with lower oil saturation. The hydration and expansion of shale resulted in the imbibition volume exceeding the oil displacement volume during the imbibition process. Moreover, the difference between these two volumes increased with higher oil saturation. The findings of this study provide a theoretical basis for improving shale oil recovery.
ZHOU Xu , MA Chao , LIU Chao , TANG Jiajing , LIU Yilin . Study on the influence of shale oil saturation on imbibition recovery rate[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(1) : 73 -78 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.01.009
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