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根据观察露头、岩心和分析钻井、测井资料 ,识别出塔里木盆地库车坳陷新生界中的低弯度河三角洲沉积。这种新发现的沉积类型是低弯度河进入极浅水湖泊形成的三角洲沉积 ,与正常三角洲沉积的区别是砂岩较粗 ,与辫状河三角洲沉积的区别是砂岩含量较低 ,与扇三角洲沉积的区别是缺少重力流沉积。库车坳陷新生界低弯度河三角洲相的亚相类型主要是三角洲平原亚相和三角洲前缘亚相 ,主要砂体类型为三角洲平原分流河道砂体和三角洲前缘水下分流河道砂体 ,原生粒间孔隙发育 ,渗透性好 ,是良好的储集层。低弯度河三角洲沉积以厚层状含砾不等粒砂岩及粉砂岩为主 ,单一砂砾岩层由多个正韵律层组成 ,厚度多为 1～ 4m ,底部具大型槽状和中型板状交错层理 ,常见侧积交错层理。
Based on the observation of outcrops, cores, and analysis of drilling and well logging data, the low-creek delta deposits in the Cenozoic in the Kuqa Depression of the Tarim Basin were identified. This newly discovered sedimentary type is deltaic sediments formed by the inflow of shallow creek into very shallow lakes. The difference with normal delta sediments is that the sandstone is coarser. The difference with the braided river delta sediments is the low sandstone content and the deposition of fan-delta The difference is the lack of gravity flow deposits. The subfacies of the Cenozoic low-crooked river delta in the Kuqa Depression are mainly delta subfacies and delta front subfacies. The main sand bodies are delta plain distributary channel sand bodies and delta front underwater distributary channel sand bodies, Primary intergranular pore development, good permeability, is a good reservoir. The low-crooked river delta is dominated by thickly layered gravelly-lacustrine sandstone and siltstone. The single glutenite layer is composed of a number of positive rhythmic layers of mostly 1 to 4 m in thickness with large trough-shaped and medium-sized lamellar crossings at the bottom Li, common side product staggered layering.