Abstract:

Research about the Carboniferous-Permian reservoir in Hefei Basin with good petroleum potential is lacking. We mainly
discuss the petroleum migration features through petrology and microthermometry analysis of the widely developed fluid inclusions in
the well AnCan 1. The results show that the homogenization temperature of these aqueous inclusions in quartz micro-cracks and quartz
secondary enlargement edge are mainly at 145.2~150.2℃, 155.6~160℃ and 169.9~177.9℃ . Combined with the burial history-thermal
history, we speculate that the reservoir experienced three major oil and gas filling stages during 162.1~157.2 Ma (Late Jurassic). By

measuring the freezing point of inclusions，we study the salinity characteristics. According to the tectonic evolution and development
background of source rocks, we conclude that the petroleum migration mainly happened whthin the carboniferous-Permian strata. In
the meantime the deep hydrothermal of the Neoproterozoic-Lower Paleozoic may also move to the Carboniferous-Permian through deep
faults, and participated the migration and accumulation of oil and gas. Attention needs to paid to research on the hydrocarbon
accumulation of this area in the future.

Key words: Fluid inclusions, Petroleum migration, Carboniferous-Permian stratum, Hefei Basin