【摘要】 塔里木盆地库车坳陷中广泛发育由辫状河进入内陆湖泊而形成的辫状河三角洲。这种辫状河三角洲的特征明显不同于其他类型的三角洲，主体是含砾砂岩及砂岩组成的辫状河道沉积及水下分流河道沉积，它们由许多向上变细的层序构成，单一层序厚０．５～５ｍ。该辫状河三角洲中交错层理丰富，其中尤以水道砂体例向迁移加积而形成的侧积交错层最为发育。由于辫状河三角洲形成时物源供给丰富且粒度粗，因此湖泊的波浪对其影响甚微．该区辫状河三角洲具有自生自储的特点，平原沉积的煤层及前三角洲泥具有一定的生油潜力；而三角洲砂体中孔隙，度及渗透性均好，且分布稳定，为理想的储集层。更多还原

【Abstract】 A braided river system progrdes into a inland lake and forms a braidedriver delta.The deltas are very abundant in the Triassic system of Kuche depression,Tarim Basin.They are significantly different from the other types of deltas in the geomorphic and sedimentological setting.The coarse deposits of the braided channel and of the subaqueous distributary channel,mainly composed of pobbed sandstones and sandstones displaying finer-upward sequences in general,constitute the main body of the deltas.A single finerupward sequence has a thickness of 0.5 to 5 m.Cross-stratifications are abundant in the braided-river deltas,but lateral accretion cross-bedding resulting from lateral accretion of sandbodies due to lateral migration of the channels are the most principal sedimentary structures.Because the braided-river deltas are characterized by a high rate of coarse sediment input,they are less influenced on by the waves.The depositional system of braided-river deltas shows a favorite source-reservoir-caprock association.The coal measure of the deltaic plain factes and the mudstones of prodelta factes have somewhat genetic potential.The sandbodies are very excellent reservoir beds because of a larger thickness,a sheet geometry with high lateral continuity,and a higher porosity and permeability.更多还原