Abstract:

Fluid inclusions are micro samples saved in reservoirs, which include a large amount of geological information. According to  the observation of fluorescence colors and  the measurement of homogenization temperatures of fluid inclusions obtained from 18 wells in the Upper Paleozoic of Tabamiao block in Ordos Basin, this paper points that there have happened six times of thermal fluid flow in the sandstone reservoirs of the Upper Paleozoic, all of which are relative to hydrocarbon chargings. By integrating the average homogenization temperatures with burial historical curves, the charging orders respectively correspond to the 190-150 Ma(the middle of the early Jurassic to the late of the Middle Jurassic period), 150-124 Ma(the late of the Middle Jurassic period to the early of the Early Cretaceous period), 124-101 Ma(the early of the Early Cretaceous period to the middle of the Early Cretaceous period)，101-86 Ma (the middle of the Early Cretaceous period to the middle-late of the Early Cretaceous period) and 86-70 Ma (the middle-late of the Early Cretaceous period). In those periods, the middle of the Early Jurassic to the late of the Middle Jurassic period is the primary stage of hydrocarbon charging, the late of the Middle Jurassic to the early of the Early Cretaceous period is the main period of oil charging and the late the Middle Jurassic period to the late of the Early Cretaceous period is the gas charging time in the favorable target beds.

Key words: Ordos Basin, Tabamiao block, fluid inclusion, hydrocarbon charging order and time