水位变化对鄱阳湖三角洲分流河道沉积特征的影响

发布时间：2018-05-26 16:03

本文选题：鄱阳湖三角洲 + 水位变化　；参考：《中国石油大学学报(自然科学版)》2017年01期

【摘要】：选取鄱阳湖赣江中支三角洲平原分流河道和信江三角洲前缘分流河道,采用现代沉积考察、剖面挖掘、粒度分析等方法,就水位变化对分流河道沉积特征的影响进行研究。结果表明:在赣江中支三角洲平原分流河道内发育滞留沉积和边滩沉积2种沉积单元;信江三角洲前缘分流河道内发育蝌蚪状砂垄砂、长条形浅滩砂、条带状河道砂3种沉积单元;三角洲分流河道砂在水位上升期向岸溯源沉积,在低水位期向盆地进积,是三角洲发育主要时期;边滩沉积在水位上升阶段发育水位上升楔状砂,在水位下降阶段发育水位下降侧积砂;三角洲前缘分流河道在水位上升期沉积蝌蚪状砂垄,被湖浪改造后在两侧河岸形成长条形浅滩砂;水位下降期沉积条带状河道砂,受水位变化影响,分流河道类砂体在平面及剖面上的砂体组合表现出一定的分带性及储层非均质性。
[Abstract]:The distributary channel of the middle branch of the delta plain of the Ganjiang River in Poyang Lake and the diversion channel of the front edge of the Xinjiang delta are selected. The influence of water level change on the sedimentary characteristics of distributary channel is studied by means of modern sedimentary investigation, section mining and grain size analysis. The results show that the deposition and edge of the distributary channel in the middle branch of the delta plain of the Ganjiang River is developed. 2 kinds of depositional units are deposited in the beach, and there are tadpole like sand ridges in the distributary channel of the Xinjiang Delta, long strip shoal sand, and 3 sedimentary units of strip channel sand; delta distributary channel sand is traced to the shore in the rising stage of the water level, and is the main period of delta development in the low water stage, and the bank deposits are in the stage of rising water level. The development level rises wedge-shaped sand and develops water level sand in the stage of falling water level; the delta front distributary channel deposits tadpole like sand ridges at the stage of rising water level, and the bar shaped shoal sand is grown on both sides of the river bank after the Lake wave is reformed; the sediment strip channel sand in the stage of water level fall is affected by the change of water level, and the distributary channel sand body is in the plane and The sand body assemblage on the section shows certain zonation and reservoir heterogeneity.
【作者单位】：中石化胜利油田分公司勘探开发研究院;中国石油大港油田公司勘探开发研究院;中国石油大学地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家重大油气专项(2011ZX05009-002)
【分类号】：P618.13

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