Abstract: Owl the basis of gravity flow theory，two kinds of sediment，grain flow sediment and turbidity current sediment，have been distinquished in the Liptodetrinite limestone of naa"zzhai Member in Jinhua area，Central Sichuan. The sedimentary model is lake-bottom fan of gravity flow. Grain flow sediments. have a much better accumulative property than turbidity current sediments. In this area，the alternative distribution of high and low produc-tivity wells Ties in the fact that high-productivity wells are in netted separate waterways where grain flow sediments are rich while low-productivity wells are on repeated tongues of fan where turbidity current sediments are rich. According to the distribution law of water-ways in fans，favourable regions containing oil and gas can be predicted.

Key words: Sedimentary microphase, Reservoir model, Turhidity current, Lake-bott-tom fan, Characteristics containing oil and gas, Daanzhai member, Jin Hua area.