Abstract
The characteristics of the pore structure and the imbibition model of rock in offshore oil and gas reservoirs are examined in this paper. Based on the analysis of rocks from tight oil and gas reservoirs in a particular sea area, it is known that the pore structure exhibits strong heterogeneity, uneven pore distribution, and significant variation in pore throat radii. The rock has a low capacity for seepage and the pore throat’s small radius makes it difficult for fluid to participate in the flow. In order to construct a reverse imbibition model and obtain precise results for imbibition velocity calculation, fractal theory was used to obtain the distribution of rock pore size in accordance with the correlation between saturation and capillary pressure. A dimensionless imbibition velocity imbibition model was used to define the normalized recovery factor, and the imbibition model’s solution results were obtained.
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