喜马拉雅运动对江陵凹陷油气成藏的影响

江陵凹陷喜马拉雅构造运动强烈,主要表现为3期,对油气运移和聚集产生重要的影响.主要表现在:1)喜山运动产生的强大的挤压力为新沟咀组油气初次运移提供了强大的动力,3期强烈的喜山构造运动时期分别对应于3次排烃期;2)晚期运动改变油气二次运移的流体动力条件,从而影响二次运移的方向、方式及油气聚集场所;3)导致构造高位油气充满度下降,而低部位的升高;4)早期、中期运动为油气聚集提供重要的构造条件,而晚期运动对早期油藏进行调整和改造,使其遭受破坏而形成次生油气藏. 

EFFECTS OF THE HIMALAYAN MOVEMENT ON THE FORMATION OF OIL- GAS RESERVOIRS IN THE JIANGLING SAG

In the Jiangling Sag, there were intensive tectonic movements of the Himalayan cycle (mainly occurring as three phases), which exerted significant effects on hydrocarbon migration and accumulation. These effects appeared in following aspects: 1)the strong compression stress derived from the Himalayan movement provided a great power for the expulsion of hydrocarbon from the Xingouzui Formation, with the three phases of the intensive Himalayan tectonic movement corresponding respectively to the three phases of hydrocarbon expulsion; 2)the late phase of the movement changed the fluid dynamical conditions for the secondary migration of hydrocarbon, and thus tended to influence the direction and way for the secon-dary migration of hydrocarbon as well as the sites for hydrocarbon accumulation; 3)the effects resulted in the decreasing of hydrocarbon-filling degree in structural highs, and led to the increasing in structural lows; 4)the early and middle phases of the movement formed important structural conditions for hydrocarbon accumulation, while the late phase of the movement tended to adjust and change the early hydrocarbon reservoirs, and even destroyed them to reform some secondary hydrocarbon accumulation.