摘要：
以渤海湾盆地饶阳凹陷古近系为例,利用包裹体岩相学和显微测温技术,研究古近系储层流体包裹体特征,并结合源岩热演化生烃史,综合分析研究区古近系油气成藏时间及期次.结果表明:研究区古近系储层有2期烃类包裹体,第Ⅰ期分布于碳酸盐胶结物及石英颗粒内裂纹中,发近黄色荧光,具有高盐度、高密度特征,伴生盐水包裹体均一温度主峰值为90～100 °C;第Ⅱ期赋存于长石溶蚀孔缝及穿石英颗粒裂纹中,发近蓝绿色荧光,具有低盐度、低密度特征,伴生盐水包裹体均一温度主峰值为120～140°C;研究区存在古近纪东营期和新近纪馆陶末至明化镇期两期生烃,明化镇期为主要生烃期;饶阳凹陷古近系具有两期成藏过程,东营组沉积后期至抬升初期和馆陶组沉积末期至明化镇组沉积期;受控于源岩热演化生烃史,凹陷中不同地区及层系的油气成藏时期及期次存在明显差异,第一期成藏范围较局限,主要发生于生烃洼陷中心生烃层系中,第二期成藏范围广泛,为主成藏期;上部层系多为一期晚期成藏,下部层系多为两期成藏.%Taking an example of Paleogene reservoirs in Raoyang Depression,a detailed study was carried out to determine properties of fluid inclusions through a combination of microscopic examination and micro-thermometric techniques.The hydro-carbon accumulation periods were defined by analyzing the hydrocarbon-generating history of source rocks.The results indicate that the hydrocarbon inclusions can be divided into two phases.The first phase is located in the carbonate cements and the frac-tures within quartz grains with characteristic yellow fluorescence, high salinity and high density.The homogenization tempera-ture of brine inclusions is from 90°Cto 100°C.The second phase is located in the dissolution fractures of feldspar and frac-tures through quartz grains with blue-green fluorescence, low salinity and low density.The homogenization temperature is mainly from 120°Cto 140°C.There are two major hydrocarbon-generating stages: the Dongying deposition period and the late Guantao deposition period to the Minghuazhen deposition period.The Minghuazhen deposition period is the major stage.A two-period hy-drocarbon accumulation is identified in Paleogene reservoirs.The first period is from the late Dongying deposition period to the early uplift stage, and the second is from the late Guantao deposition period to the Minghuazhen deposition period.Controlled by the thermal evolution and hydrocarbon-generating history of source rocks, the accumulation periods of different parts and lay-ers are different.Petroleum reservoirs generated in the early period are mainly distributed in the source rock layers in the center of hydrocarbon-generating sags.Reservoirs generated in the second period cover all the area which is the main accumulation pe-riod.The upper layers are characterized with late accumulation period, while the lower with two periods.
