Method for rapidly identifying unconventional gas reservoir

The invention discloses a method for rapidly identifying an unconventional gas reservoir. The method comprises the following steps: a, collecting and arranging logging engineering parameters and geological parameters of a target layer; b, calculating a logging clay index MLCF by utilizing the logging engineering parameters and the geological parameters; c, calculating a drilled stratum free gas content index MLGA by utilizing the logging engineering parameters and the geological parameters; d, producing an MLCF-MLGA crossplot by utilizing the calculated logging clay index MLCF and the drilled stratum free gas content index MLGA; e, rapidly identifying the development situation of the unconventional reservoir by utilizing the MLCF-MLGA crossplot. By adopting the method, the advantages of the logging-while-drilling technology such as timeliness, high efficiency, truth and rapidness can be realized, the logging engineering and geological parameters are comprehensively utilized, and the development situation of the compact gas reservoir can be rapidly identified.