Study on Transgressive Storm-dominated Shoreline-neritic Shelf Sandbody: a case of the lower bitumen-bearing sandstone member of Silurian in Tazhong Area

Transgressive storm-dominated shore-neritic sedimentary system was developed in the lower bitumen-bearing sandstone member during Silurian period of Tazhong area in Tarim basin.The types of sandbody are shore sandbody,neritic sand bar and shelf sand in the lower bitumen-bearing sandstone member.After the storm,the distribution of shelf sand became larger than before.The physical property of sandstone during progression is better than that of sandstone of tidal flat during marine regression.There are many different characters on the sand bodies,and the shore-neritic sand bodies are the very important reservoir for the stratigraphic traps.