Prediction method for forced self-absorption quantity of shale reservoir stratum

The invention discloses a prediction method for the forced self-absorption quantity of a shale reservoir stratum. Shale is divided into organic matters and inorganic matters (clay minerals) by analyzing shale minerals. A self-absorption prediction method for the organic matters of the shale is established by considering influence of capillary force and forced self-absorption force on the organic matters in the fracturing process, noncircularity characteristics of capillary tubes of the organic matters and a boundary slip effect together with a fractal theory. A self-absorption quantity prediction method for the shale clay minerals is established by considering influence of capillary force, clay aperture osmotic pressure and forced self-absorption applied force on the clay minerals in the fracturing process, as well as influence of capillary-tube noncircularity characteristic, boundary slip effect, clay aperture osmotic pressure and forced outside force of practical organic matters, andcombining the fractal th