大民屯凹陷油气充注史研究

油气充注历史的研究一直是石油地质学和油藏地球化学的重点和难点,而近年来流体定年技术的兴起为人们解决油气充注期次和时间提供了定量分析手段.利用伊利石K-Ar定年技术和流体包裹体均一温度分别研究了大民屯凹陷油气充注史.前者确定出的主充注期略晚于后者的分析结果.结合生烃史模拟资料认为:伊利石K-Ar定年结果可能更精确,但其样品挑选难度大,且只能用于砂岩油藏成藏史分析.而流体包裹体均一温度可用于碎屑岩和非碎屑岩油藏成藏史的分析.大民屯凹陷下第三系和太古界潜山油藏主充注时期为沙一二—东营早期,其中北部安福屯洼陷成藏期(沙一二期)略早于南部荣胜堡洼陷(东营早期).

A study on the hydrocarbon filling history of Damintun Depression

The study on the hydrocarbon filling history is regarded as the focal point and difficult point to petroleum geology and reservoir geochemistry.Fluid dating technique is a recently developed method for quantitatively analyzing the phases and times of hydrocarbon filling history.The principle and application conditions of the fluid dating technique are presented in this paper,and the hydrocarbon filling history of Damintun Depression is studied by means of illite K-Ar dating technique and fluid inclusion homogenous temperature separately.The result shows that the main filling period determined by the former is later than that determined by the latter.Integrating with the hydrocarbon generation history obtained by basin simulation technique,it is held that the hydrocarbon filling period determined by illite K-Ar dating technique is more accurate.But the illite K-Ar dating technique can only be used for the analysis of the forming history of sandstone reservoirs,and the selection of experimental samples is difficult.While fluid inclusion homogenous temperature can be used for the analysis of the forming history of clastic rock and un-clastic rock reservoirs.The main charging period of early Tertiary and Archaean group reservoirs is the end of Es1+2 to early Ed period.The forming time of Anfutun subsag in the north of the Damintun Sag is earlier than that of Rongshengpu subsag in the south of it.