At present

the optimizing evaluation indexes of the existing favorable target areas of shale gas

is not comprehensive

and the evaluation methods are not taking full advantage of the uncertain information indexes. Therefore

the enrichment

accumulate

and storage of the shale gas

and the surface condition of the exploration and development are analyzed. On this base

by combining the successful exploring experience of the shale gas aboard with the characteristics of the domestic marine shale gas accumulation

we selected 13 comprehensive evaluation indexes

including the netshale thickness and the organic carbon content of the shale gas favorable target areas

and proposed the corresponding classified evaluation standards. Because of the thick shale gas reservoir

the heterogeneity and the lack of the geological awareness of the evaluation parameters

the interval value of the evaluation indexes replaced the average value of the uncertain information evaluation index

and the fuzzy similarity evaluation method based on the fuzzy similar theory was established. The calculation results show that

compared with the comprehensive information superposition method

this method is more reasonable

effective

simple and useful. It can provide reliable evidences for the optimal of the favorable target areas of shale gas.