Shale oil content recovery method based on forward modeling

The invention relates to a shale oil content recovery method based on forward modeling. The recovery method comprises the following steps: crushing a rock core sample to obtain sample powder; performing thermal evolution simulation on the sample powder to obtain simulated samples, and equally dividing the simulated samples into a simulated group A and a simulated group B; performing Soxhlet extraction and low-field nuclear magnetic resonance measurement on the simulated group A to obtain a nuclear magnetic resonance signal corresponding to unit mass chloroform bitumen 'A'; carrying out low-field nuclear magnetic resonance measurement on the simulation group B to obtain nuclear magnetic resonance signals of simulation samples with unit mass and different maturity degrees in an initial state and at different placement times; and then calculating and fitting to obtain the change relation of the simulated oil contents of the simulated samples with different maturity degrees along with time and an oil content reco