Experimental Study on Saturation Correction for Sealed Core Wells of Light Oil Reservoir in Shahejie Formation in Bonan

The oil-water saturation of sealed core wells should be corrected due to the offset between test results and real conditions. The sealed core wells of light oil reservoir which have high gas-oil ratio in Shahejie formation in Bonan can be taken as an example. Laboratory experiments are carried out to simulate the degasification process and pore compaction. The influence of the error on the measurement method of water saturation is also considered. The experiment results show that saturation loss caused by pore compaction is greater than that casued by degasification, and the loss due to test methods is minimal. According to the experimental results, the saturation correction formula of the sealed core wells in this type of light oil reservoir is established. The measured water saturation is corrected to obtain the true reservoir oil-water saturation data. It can be used to guide the development of oil field effectively by using the corrected oil-water saturation data.