Based on the outcrop survey, laboratory test of rock samples and previous researches, the conditions of shale gas accumulation in the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in Wulong area of southeast Sichuan Basin were studied in detail. The results indicate that the black shales of Wufeng Formation and the lower Longmaxi Formation are mainly formed in deep shelf sedimentary environment. The organic-rich shale features great thickness, wide distribution, moderate burial depth (0.3~3.5km) and high brittle-mineral content. The TOC values mainly distributed between 2,~5,, and the thermal evolution is at the highly mature stage to early overmature stage. The pore space are solution vugs, intergranular micropores, intragranular micropores, organic pores and microcracks. It is proposed that five zones are the favourable enrichment areas for prospecting of shale gas.