Influence of Hydrocarbon Charging to the Reservoir Property in 1st Member of Funning Formation in Gaoyou Depression

Abstract:

Through the microscopic observation of reservoir diagenetic phenomenon and statistical analysis of reservoir property for1st Member of Funning Formation in Gaoyou Depression, it is found that the evolution of reservoir property is influenced by hydrocarbon charging. To have an effect on the processes and intensity of diagenesis, hydrocarbon charging made the reservoir property different between oil layer and non oil layer. Generally speaking, oil layer’s property is better than non oil layer’s. For the specific influences of hydrocarbon charging, it can promote dissolution, suppress the late carbonate cementation and weaken quartz overgrowth, while when it comes to compaction, three conditions should be taken into consideration: overpressure, normal pressure and transformation from oil to asphalt. Overall, hydrocarbon charging plays an active role in reservoir property evolution.

Key words:Gaoyou Depression; 1st Member of Funning Formation; hydrocarbon charging; reservoir property