A multipoint geostatistical pre-stack inversion method based on an updated theory of permanence of probability ratio, comprising the following steps: organizing data, gridding a work area, distributing well data, assigning an initial attribute value to a simulated work area, selecting a data template of a suitable size, and terminating inversion and determination iteration. A priori information is acquired by utilizing the multipoint geostatistical method, and then filtered via a minimum target function, thus reducing the complexity of seismic inversion, and increasing the precision of storage layer inversion.
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