摘要
Based on the previous studies and by using the data of seismic,logging,cores,slice and geochemical,the source direction of Shawan group of study area was confirmed through various evidence of sandstone thickness,sandstone clastic composition,paleo-geomorphology and sandstone heavy mineral content.The sedimentary facies and Shawan group exhibition characteristics were studied by means of the data and method of petrology,grain size analysis,log facies and seismic facies.The sedimentary facies model was studied by combining with the construction background,paleo-geomorphology and the structure style of sequence stratigraphic system. The results show that the provenance of Shawan area includes two source system directions. Moreover,the extension distance of southwest direction of provenance is long and the influence range is wide. The subaqueous distributary channel sand of braided stream delta front is easy to form the type of pointed lithologic trap and the coastal-shallow lake sand develops the lens lithologic trap easily.