Early Silurian sedimentary rocks in Sichuan area were formed in the foreland basin stage during the period from the Late Ordovician to the Early SilurianIn Longmaxi Age of the Early Silurian，the study area was mainly a restricted deep shelf In Xiaoheba Age，it behaved as the expansion of the shallow shelf and reduction of the deep shelf，and the sedimentary differentiation was intensifiedThe palaeogeographic framework was the coexistence of carbonate platform，shallow and deep shelvesIn Hanjiadian Age，it mainly was the tidal flatshallow shelf environmentsEarly Silurian in the study area showed an evolutionary trend of shallowing fillingup and regression，and was characterized by blending continental shelf with multisourcesThe distribution of sedimentary systems and sedimentary evolution was controlled by the NWdirection squeezing of the foreland upheaval zone including the Qianzhong upheaval from the Late Ordovician to the Early SilurianThe development of the favorable reservoir body was mainly dependent on the sedimentary environmentsThe seashore sand bank and carbonate platform margin were the favorable reservoir body belts such as the“Xiaoheba sandstone”in eastern Sichuan area and the bioherm limestone in southern and northern Sichuan area