Oil and gas accumulation history using fluid inclusions and basin modeling - Example from the western slope of the Yuanyanggou sub-sag

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.