The invention discloses a geological characterization method of a transforming volume of a
shale gas reservoir. The method comprises the following steps: acquiring reservoir physical properties and rock mechanical parameters; calculating
brittleness factors Brit, novel
brittleness factors Bn, reservoir breaking tenacity indexes Kn,
natural fracture open difficulty indexes Pn and crack through evaluation indexes Cn corresponding to
logging points; establishing novel evaluation factors En corresponding to
logging data points and judging the novel evaluation factors; and finally, acquiring the transforming volume of the reservoir through a crack propagation wave and length Lo, wave and height Ho and wave and width Wo. The method disclosed by the invention has the beneficial effects that by means of static production data, the transforming volume of the reservoir is pre-evaluated by adopting dynamic geological data such as
logging, so that the deployment of a well toil and a beneficial fracture section are formulated and selected before fracture construction, and the method is of relatively high practicality.