Identification of Reservoir Water-Flooding Degrees via Core Sizes Based on a Drip Experiment of the Zhenwu Area in Gaoyou Sag, China

In order to identify the degree of water flooding in a reservoir and discover any remaining oil-enriched areas, this paper, systematic study on cores obturated coring wells is carried out. With observations testing data cores, based notion sedimentary facies, water-flooding degrees 4–7 sand groups member one Paleogene Sanduo Formation (E2s14–7) Zhenwu area Gaoyou Sag are determined. Overall, results show that formed under background lake regression, with various systems, mainly including delta braided fluvial meandering facies. The determined using point-by-point drip experiment core. Combined core, different facies quantitatively Identification standards for river established. body generally weak, an oil saturation rate 24.1–40.2%, essentially indicating no or weak flooding. significantly changes, variation range measurement also large. weaker than body, which mostly not flooded weakly flooded. obviously controlled by rhythm type. top positive rhythm, bottom sludge bed point bar, deltaic front subaqueous distributary channel, bar have relatively low degrees. They subjects subsequent development adjustment potential tapping.