Method and device for obtaining fluid radial oil-water saturation change of undisturbed zone

The invention discloses a method and a device for obtaining fluid radial oil-water saturation change of an undisturbed zone, comprising steps of targeting an undisturbed zone sample under each measurement depth in a plurality of measurement depths, determining irreducible fluid data in the undisturbed zone sample according to the experience parameters of the undisturbed zone sample, obtaining the fluid data in the undisturbed zone according to the irreducible fluid data in the undisturbed zone sample, taking the fluid data of the undisturbed zone sample as an integrity to successively perform interpolation operation, inverse operation and the inverse operation of the interpolation operation, obtaining a fluid T2 spectrum in the undisturbed zone sample, extracting the oil signal spectrum and the water signal spectrum in the fluid T2 spectrum, and obtaining the fluid oil saturation in the undisturbed zone sample according to the oil signal spectrum and the water signal spectrum. The invention obtains the fluid radial oil water saturation change according to the fluid oil water saturation of the undisturbed zone sample under a plurality of measurement depths and enables the result to be close to the undisturbed zone storage and more accurate.