Abstract:

A number of beach-bar sandstone reservoir beds which have attracted more and more attentions, are developed in the upper fourth member of Shahejie Formation (Es^s₄ ) of the Wangjiagang oilfield. Based on the analysis of seismic and logging data and an experiment, this paper analyzes the hydrocarbon distribution characteristics and play elements of beach-bar sandstone in the upper fourth member of Shahejie Formation (Es^s₄ ) of the Wangjiagang oilfield. The results showed that the beach-bar reservoir beds with thin interbedded sandstone have strong heterogeneity. Hydrocarbon distribution and properties were extremely non-uniform. Migration pathways are the important condition of hydrocarbon accumulation in the regions which suffered strong tectonic movements. Reservoir bed heterogeneity is another controlling factor of non-uniform distribution of hydrocarbon. Simulated experiment indicated that the change of driving force for hydrocarbon migration impacted selective accumulation mechanism in the process that hydrocarbon moved vertically along fault zone to the reservoir and distribution of hydrocarbon in the reservoir.