通过加水热模拟实验对一褐煤样的生烃特征进行了研究，并利用压汞法研究了在热演化过程中煤源岩孔隙结构变化特征。结果表明煤源岩热解产物的形成和煤成油气初次运移与煤源岩孔隙结构之间有着密切的关系。在低温阶段，煤源岩中出现了较多的大孔隙和裂隙，此时主要是液态产物形成和排驱运移；在高温阶段，煤源岩大孔隙和裂隙消失而微小孔隙大量形成，此时主要是热解气大量形成和排驱运移。 The hydrocarbon generation characteristics of a lignite-like sample were studied by hydrothermal simulation and the pore structure of coal-derived rocks during thermal evolution was studied by mercury intrusion. The results show that there is a close relationship between the formation of pyrolysis products of coal source rocks and the primary migration of coal into oil and gas and the pore structure of coal-derived rocks. In the low temperature stage, there are more macropores and fractures in the coal source rocks, at this time, the formation and displacement of liquid products mainly occur. At the high temperature stage, the macropores and fissures of the coal source rocks disappear while a large number of tiny pores are formed, When pyrolysis gas is mainly a large number of formation and displacement drive.