不同环境下陆相页岩油气富集关键要素下限研究
——以中原油田探区为例

Research on lower limits of key factor controlling hydrocarbon accumulation of continental shale in different environments: taking exploratory area of Zhongyuan oilfield as an example

徐田武 张成富 李红磊 陈帆 王金萍 胡美玲

中国石化中原油田分公司勘探开发研究院，河南 濮阳 457001 中国石油华北油田分公司勘探开发研究院，河北 任丘 062552

通过研究中原油田三大探区不同环境下的页岩油气成烃成藏要素，发现不同环境下形成规模性页岩油气的成藏关键要素下限存在差异：在咸水环境下，能够形成有效烃源岩的总有机碳质量分数（TOC）下限为0.6%，镜质组反射率（Ro）下限为0.5%；在淡水环境下，TOC下限为1.5%，Ro下限为1.0%；在半咸水环境下，TOC下限为0.8%，Ro下限为0.7%。随着沉积水体由咸变淡，形成有效页岩油气的TOC及Ro下限存在逐渐升高的趋势，其内在机理为不同环境下生烃母质的差异造成。

Based on the study of hydrocarbon generation and accumulation factors of shale oil and gas in different environments in three exploratory areas of Zhongyuan oilfield, it is found that the lower limits of key factors for shale oil and gas accumulation are different in different water environments. In the saline water environment, the lower limit of the total organic carbon (TOC) for the source rock that can generate effective shale oil is 0.6%, and the lower limit of vitrinite reflectance (Ro) for the source rock is 0.5%; in fresh water environment, the lower limit of TOC for effective source rocks is 1.5%, and that of Ro is 1.0%; in the brackish water environment, the lower limit of TOC is 0.8% and that of Ro is 0.7%. As the sedimentary water changes from salty to fresh, the lower limit of TOC and Ro for source rocks that can generate effective shale oil and gas increase gradually, the main inherent mechanism is the difference of hydrocarbon generating parent material in different environments.

10.6056/dkyqt202206001