Abstract:

Defining the hydrocarbon migration period and the path is a key to the analysis of oil and gas reservoir．The time and space distribution characteristics of hydrocarbon migration and the accumulation kinetics of the western slope of Yuanyanggou sub-sag are determined, through homogenization temperatures of fluid inclusions，simulation and paleo-geothermal history and petroleum inclusions particles index GOI statistics. The results show that the Hydrocarbon migration times of the western slope of the Yuanyanggou sub-sag are Ed₂，Ed₁ and Nm，of which the Ed₂ and Ed₁ are two main stages．A basin modeling study further shows that the Shahejie Group began to produce oil at the end of Es₁， but large-scale oil and gas expulsion and accumulation started during the Ed period．The statistical and analysis indicate that the high-value areas of GOI (GOI>5%) is favorable areas for hydrocarbon accumulation, and Huanxiling and Shuangnan oilfields are in the GOI>5% region．A perfect time and space distribution characteristics of hydrocarbon migration may be determined by the information from enclosure and basin modelling.

Key words: enclosure;hydrocarbon accumulation period, homogenization temperature, basin modeling, western Liaohe sag, Yuanyanggou sub-sag