针对沧东凹陷页岩油渗吸置换规律与排采制度不明确问题，考虑“渗吸-返排-产能协同化”，建立的模型能够动态地反映渗吸置换作用与返排速度、闷井时间等工程参数相互制约和协同。通过进行全生命周期地质工程一体化数值模拟，明确了沧东凹陷孔二段主力开发层系C1、C3两个甜点层的渗吸置换规律与最佳返排制度。结果表明：返排过程仍然存在渗吸置换作用；C1、C3甜点的合理闷井时间为37 ~ 42 d，合理返排速度20 ~ 40 t/d。研究成果为深层页岩油气的渗吸机理研究与合理排采制度研究提供理论基础。

Addressing the lack of clarity regarding spontaneous imbibition displacement mechanisms and production management strategies for shale oil in the Cangdong Sag, a model was established that considered the "synergy of imbibition, flowback, and productivity". The model was designed to dynamically reflect the mutual constraints and synergies between spontaneous imbibition displacement and engineering parameters such as flowback rates and soaking durations. Through comprehensive numerical simulations integrating geology and engineering across the entire lifecycle, the spontaneous imbibition displacement patterns and optimal flowback regimes for the C1 and C3 sweet spots in the Kong-2 Member, which served as the main development interval in the Cangdong Sag, were elucidated. The results indicate that spontaneous imbibition displacement continues to occur during the flowback process. The optimal soaking durations for the C1 and C3 sweet spots are determined to be between 37 and 42 days, with a reasonable flowback rate ranging from 20 to 40 tons per day. The research findings provide a theoretical foundation for studies on spontaneous imbibition mechanisms and reasonable production management strategies for deep shale oil and gas reservoirs.