东海盆地丽水凹陷油气源对比与成藏史

丽水凹陷储集层内流体包裹体显微镜下鉴定、均一温度测试及生物标志物成分分析表明，该凹陷大致发生过三期油气运移：第一期大致发生在古新世末期，该期烃流体成熟度偏低(R0值小于0．7％)，为下古新统月桂峰组来源，与热水溶液不混溶运移，分布范围广；第二期运移在中晚始新世，烃流体成熟度较高(R0值不小于1.0％)，为下古新统月桂峰组来源，该期烃流体主要在月桂峰组烃源岩附近成藏；第三期运移发生在渐新世以后，由于构造抬升，深部油气藏遭破坏，油气沿断层向浅部运移并与上古新统生成的油气一起进入浅部储集层(明月峰组)，幔源CO2热流体可能略晚于该期烃流体充注。图3表3参10

Petroleum reservoir filling history and oil-source correlation in the Lishui Sag, East China Sea Basin

Depending to the synthetic studies of petrography, homogenization temperature and biomarker of fluid inclusion, it is shown that there are three times petroleum migrations in the Lishui Sag. The earlier petroleum migrating occurred at the end of Paleocene. The hydrocarbon fluid has maturity equivalent to lower R_(o),0.7%. It is generated from Yueguifeng Formation and mixed hydrothermal up, the hydrocarbon inclusions are trapped in the first filling stage occurs widely in the Lishui Sag. The second migration happened during the middle-upper Eocene. The maturity of hydrocarbon fluid is equivalent to higher R_(o),(1.0)%, which is generated from the Yueguifeng Formation and accumulated nearly the Yueguifeng Formation. The third one charged during the later Oligocene to Miocene. As the crust uplift, some of the oil/gas within the reservoir in deeper layer had been re-migrated upward by the fault, and mixed petroleum generated from upper Paleocene up into the shallow layer. The CO_(2)-bearing fluid charged into the reservoir is later than the third stage.