Shale reservoir attribute three-dimensional modeling method based on horizontal well

The invention provides a shale reservoir attribute three-dimensional modeling method based on a horizontal well. The method comprises the following steps: S1, performing stratum isochronous subdivision comparison in a research area; S2, generating a grid layer serial number attribute; S3, generating and exporting a geometric attribute curve of the horizontal well along the well; S4, marking well sections, not drilled through, of the stratum in the research area; S5, marking the repeated sampling well sections in the research area; S6, importing the marked data curve, and screening and coarsening single well attribute curve data; S7, acquiring longitudinal distribution characteristics and overall distribution characteristics; S8, performing single well attribute curve coarsening and transverse distribution characteristics; S9, acquiring attribute distribution variation function parameters; S10, acquiring an attribute distribution trend model and performing three-dimensional distribution random modeling; and S1