• 责任者：Zhu Xiaomin (College of Geosciences ; China University of Petroleum ; Beijing 102249 ; China) ; Pan Rong
• 刊名：Journal of China University of Petroleum
• 出版年：2013
• 卷期：37(5)
• 关键词：砂体 ; sand bodies ; 三角洲环境 ; deltaic environment ; 库车坳陷 ; Kuqa Depression
• 页码：p.7-14
• 图表：5 illus., 23 refs.
• 分类号：1003
• issnNo：ISSN1673-5005
• isbnNo：CN37-1441/TE

     Based on the systematic analysis of sedimentary characteristics of shallow-water deltas, and in combination of a case study of the shallow-water deltas of the Lower Cretaceous Bashijiqike formation in Kuqa depression, the general classifi- cation of shallow-water deltas was discussed. According to different feeding system, shallow-water deltas can be divided into shallow-water fan-delta, shallow-water braided-delta and shallow-water meander-delta. The development of shallow-water del- tas requires conditions such as a stable tectonic setting, a wide basin with gentle slope, shallow water, frequently varying lake levels, suitable climate, ample sandy river supplies and other favorable geological conditions. Shallow-water deltas are characteristics of coarse grain size deposited within the strong water dynamic conditions. Single delta is thin and widely spread while composite deltas cover a vast area with great thickness. Shallow-water deltas develop distributary channels but few mouth bars. Shallow-water deltas do not have continuous facies sequence in the vertical direction, and lack the three-lay- er structure of traditional deltas. Case study shows that the shallow-water braided delta of the Lower Cretaceous Bashijiqike formation in Kuqa depression has the following characteritics： low compositional maturity and low to medium textural maturi- ty, cross bedding formed by strong hydrodynamic power, intermittent positive rhythm, and frequently diverted underwater distributary channels, channel sandbodies superimposed in vertical and horizontal direction with large thickness, and far ex- tended distance. All of the characteristics are favorable to the formation of lithologic reservoirs.