Study on Sedimentary System and Models for Tataertage Formation(Lower Silurian) in Tarim Basin

By studying the sections and cores of Tarim basin,the Tataertage Formation of lower Silurian in Tarim Basin primarily deposited a set of clastic rock composed of sandstone and mudstone.The authors divided Tataertage Formation into onshore sedimentary system and continental shelf sedimentary system by its lithologic,ethologic and geographic character.And the onshore sedimentary system could be further divided into non-barrier coast sediment and barrier wadd sediment.Its shallow shelf sediment features the continental shelf sedimentary system.The authors also studied the types of rock,grains size distribution and sedimentary tectonic character of these sedimentary facies of Tataertage Formation mentioned above.Based on these studies,the authors analyzed the plane distribution character of Tataertage Formation during sedimentation.The direction of its strike is approximate by south to north,layers distribute nearly parallel from west to east as a whole.The authors established the onshore,wadd,onshore-wadd sedimentary model of Tataertage Formation in Tarim Basin,which is primary onshore-wadd sedimentary model.