Shale porosity determination method based on surfactant solution saturation treatment

The invention relates to the technical field of oil-gas exploration, and provides a shale porosity determination method based on surfactant solution saturation treatment, and the method comprises the following steps: collecting a shale sample; carrying out pressurization saturation treatment on the shale sample by adopting a surfactant aqueous solution; performing nuclear magnetic resonance measurement on the saturated shale sample, and calculating the porosity of the saturated shale sample; drying the saturated shale sample; performing nuclear magnetic resonance measurement on the dried shale sample, and calculating the porosity of the dried shale sample; and deducting the porosity of the saturated shale sample and the porosity of the dried shale sample to obtain the total porosity of the shale sample. The method provided by the invention is low in analysis cost, simple in measurement process, high in completion speed, good in accuracy and high in reliability, and accurate shale reservoir evaluation paramete