冀北坳陷中元古界地层分布有广泛的沥青、油苗显示，说明该地区曾发生过大规模的生烃成藏历史。文章运用显微岩相学观察和流体包裹体分析技术，对冀北坳陷芦家庄古油藏和双洞古油藏进行了油气成藏期次研究。通过显微岩相学及包裹体测温显示，芦家庄古油藏在中元古代经历了第一次大规模的油气成藏后，在燕山期经历了第二期次的油气成藏过程；双洞古油藏则在燕山期经历了两个期次的油气成藏过程。包裹体均一温度分析显示，两个古油藏在燕山期的油气成藏时间集中于185~150 Ma。研究表明，冀北坳陷古油藏的成藏关键期与燕山期区域性火山活动异常活跃所致的古地温高温期有关。

Solid bitumen and oil seepage are widely distributed in the Mesoproterozoic strata in the Jibei Depression, North China, suggesting large scales of hydrocarbon accumulation. In this study, microscopic petrographic observations and fluid inclusion analyses were used to reconstruct the hydrocarbon accumulation history in the Lujiazhuang and Shuangdong paleo-oil-reservoirs within the Jibei Depression. Results show that there was a large scale of hydrocarbon accumulation during the Mesoproterozoic. One more stage of hydrocarbon accumulation occurred during the Yanshanian in the Lujiazhaung paleo-oil reservoirs, while two more stages in the Shuangdong paleo-oil reservoirs. The homogenization temperatures of fluid inclusion indicate that the time of hydrocarbon accumulation of the two paleo-oil reservoirs during the Yanshanian was concentrated during 185-150 Ma. Our study shows that the critical time of hydrocarbon accumulation in the Jibei Depression was related to the high paleo-geotemperature caused by regional active volcanic activity during the Yanshanian.