Abstract
Spontaneous imbibition widely occurs during the industrial development of tight reservoirs. Clarifying the spontaneous imbibition mechanisms and the key influencing factors contributes to the recovery of such reservoirs. In this study, basic tests of petrophysical properties and spontaneous imbibition experiments are conducted on 11 tight sandstone cores sampled from Dongying Sag, Bohai Bay Basin, China. The mass change and distribution of imbibed water are monitored by balance and nuclear magnetic resonance during the imbibition experiments. The petrophysical properties and fractal parameters are implemented to investigate the factors influencing imbibition in tight sandstone. The imbibition curves of 11 samples display a relatively similar shape but have differences in the final mass, the time required to reach the final mass and the slopes of the early stage. The effect of pore characteristics on imbibition process is explicated by nuclear magnetic resonance results. In the double logarithmic diagram, the imbibition curves can be divided into two regions. The main influencing factors of the final dimensionless imbibition mass are porosity, fractal dimension, and succolarity, indicating that the amount, complex characteristic, and connectivity of pores are critical for imbibition. However, no obvious relationship could be established between the permeability, lacunarity, and final dimensionless imbibition mass. The results assist with the clarification of the imbibition effect and its influencing factors during the industrial development of tight sandstone reservoirs.
Published Version
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