Combining the production data with reservoir fluid data and its parameters,this paper deduced a new method to get the initial oil saturation and current oil saturation in a reservoir.

Physical simulation of the control of source rock oil saturation on forming lithological oil pools;

Method of improving calculation accuracy of oil saturation;

Relationship between capillary pressure data of intrusive mercury method and oil saturation;

Discussion on Computing Oil-Bearing Saturation from Fluorescence Intensity;

Taking the abroad NMR instrument as an exam ple, the author introduced the calculation formula for effective porosity, perme ability evaluation model, movable and irreducible fluid saturation, and effectiv e oil-bearing saturation.

A simplified calculating method is also presented based on oil-bearing saturation formula and experience formula.

Experiment:water flooding characteristics of low oil saturation sandstone reservoirs;