中文摘要：

致密油气藏已经成为非常规油气领域的开发重点。渗吸作用作为致密油气渗流机理的重要内容，可以有效地提高致密油气藏的采收率，但目前这方面的研究较少。选取中国典型致密油气储层基质岩心，进行不同条件下的渗吸实验。对实验现象与实验结果进行深入分析，提出新的致密油气储层基质岩心渗吸机理——层渗吸理论，即渗吸是从岩心表层开始逐层向岩心内部进行的。根据修正质量法计算渗吸效率的公式得到准确的室内渗吸实验数据，并将数据标定为实际地层尺度。结果表明，致密油气储层基质岩心在地层条件下的油水渗吸效率为12%~18%，渗吸速度数量级为1×10-4cm/min。应用渗吸作用开发致密油气需要与其他开发方式相结合，才能提高致密油气产量的最终效果。

英文摘要：

Tight oil and gas have become the key point of research and development in the field of unconventional oil and gas. As an important part of tight oil and gas seepage mechanism,the influence of imbibition can effectively improve the recovery of oil and gas. However,there are few researches on it. The imbibition experiment was conducted under different conditions on matrix cores of the domestic typical tight oil and gas reservoir. The phenomenon and results in this experiment were analyzed. A new seepage mechanism of the matrix cores in the tight oil and gas reservoir was purposed,called layer imbibition theory,which means the imbibition starts from the surface of the cores to the inner of the cores step by step.The imbibition efficiency formula according to the quality method was revised and the accurate results of the indoor imbibition experiment were calculated,and the results were calibrated to the actual formation scale. The results show that the oil/water imbibition efficiency of the matrix cores in the tight oil and gas reservoirs is 12%-18% under reservoir condition and imbibition speed is estimated in the order of magnitude of 1×10-4 cm/min. It is necessary to use the imbibition method together with other displacement methods for the tight oil and gas reservoirs so as to improve the final recovery of the tight oil and gas.