中文摘要：

针对含油气盆地目的层之上普遍存在剥蚀卸载的问题，以卸载时下伏饱和介质必然发生回弹为理论基础，探讨了剥蚀卸载过程中的砂体回弹对大庆油田形成的相对贡献。岩心回弹物理模拟实验表明，大庆油田青山口组储层的砂岩回弹应变最大可达1．143％，并与有效上覆压力存在着指数关系，影响应变的主要因素是轴向应力和砂岩的粒度。在大庆油田目的层之上两次重要的剥蚀卸载事件中，砂体回弹所泵吸的油气资源量为（0．8984～2．6952）×10^8 t，占大庆油田总资源量的1．45％～4．35％，因而认为砂体回弹可能是大庆油田成藏的机理之一。

英文摘要：

According to the theory of saturation media rebounding during unloading, the contribution of sandstone rebounding to the Daqing Oilfield was discussed during the uplift erosion. The results of rebounding physical simulation experiments show that the rebounding strain of sandstone in Qingshankou formation has a considerable value of 1. 143% and an exponential relationship with the overburden effective pressure, and the axial stress and the granularity of sandstone play an important role in sandstone rebounding strain. Based on the result of the experiment, the hydrocarbon resource amount pumped by sandstone rebounding during the two times uplift-erosion unloading of Daqing Oilfield is （0. 898 4 - 2. 695 2 ）×10^8 t totally, which is the 1.45% -4. 35% of total resource of Daqing Oilfield. So the sandstone rebounding could be the mechanism of hydrocarbon accumulation of Daqing Oilfield.