辫状河转曲流河沉积特征分析——以阜康凹陷东缘头屯河组为例

Analysis of sedimentary characteristics of braided river to meandering river: taking Toutunhe Formation on the eastern margin of Fukang Sag as an example

韩宗来 德勒恰提·加娜塔依 姚宗全 曹天儒 阿克丹·斯坎迪尔

新疆大学地质与矿业工程学院，新疆 乌鲁木齐 830000 中亚地质矿产信息集成自治区重点实验室，新疆 乌鲁木齐 830000

College of Geology and Mining Engineering, Xinjiang University, Urumqi 830000, China Autonomous Region Key Laboratory of Central Asia Geological and Mineral Information Integration, Urumqi 830000, China

为了剖析阜康凹陷东缘头屯河组沉积特征及其沉积演化模式，文中结合岩相特征、垂向序列、结构构造等相标志，对头屯河组沉积相进行准确识别，弥补了研究区大部分地区沉积相研究的不足。研究结果表明：头屯河组主要发育块状层理砾岩相、板状交错层理砂砾岩相、槽状交错层理砾岩相等12种岩相类型；研究区沉积相以近源辫状河、曲流河、河漫滩湖泊为主，进一步划分出亚相和微相，并建立多期曲流河砂体叠加模式；探讨了头屯河组沉积演化序列，划分出1个上升的长期基准面旋回、1个完整的中期旋回和2个上升半旋回，建立了头屯河组沉积演化模式。该成果对研究区的勘探开发具有一定的指导作用。

In order to analyze sedimentary characteristics and sedimentary evolution model of Toutunhe Formation on eastern margin of Fukang Sag, combined analysis of facies characteristics, vertical sequence, formation structure and other facies marker, accurate identification for sedimentary facies in Toutunhe Formation are carried out, which can make up for the lack of research on sedimentary facies in most study areas. The results show that 12 lithofacies types are mainly developed in Toutunhe Formation, such as massive bedding conglomerate, plate cross bedding glutenite, trough cross bedding conglomerate and so on. There are mainly sedimentary facies of near source braided river, meandering river, overflowing lake in the study area, and the subfacies and microfacies are further divided. The multi-stage meandering river point bar migration superposition model is established. This paper discusses the sedimentary evolution sequence in Toutunhe Formation, and divides it into one ascending long-term base level cycle, one complete medium-term cycle and two ascending half cycles, and finally establishes its sedimentary evolution model. The results have certain guiding effect for the exploration and development in study area.

10.6056/dkyqt202303010