The Upper Carboniferous Huanglong Formation in the Shuangjiaba gas field of northeast Chongqing is the principal producing formation of natural gas pool. Studies show that the Huanglong Formation consists of two types of sedimentary systems, i.e., sabkha and continental shelf. On the basis of sedimentary facies of each well, the plane distributive map of sedimentary micro-facies about the first member, the second member and the third member of the Huanglong Formation was compiled.