松辽盆地湖泊浅水三角洲沉积动力学研究  

ANALYSIS OF THE SEDIMENTARY DYNAMIC PROCESS OF THE SHALLOW-WATER LAKE DELTA IN THE SONGLIAO BASIN, NORTHEAST CHINA

作　　者：韩晓东[1] 楼章华[2] 姚炎明[2] 杨卫东[3] 蔡希源[4] 

机构地区：[1]大庆石油管理局勘探开发研究院,大庆163712 [2]浙江大学海洋系,杭州310028 [3]中国科学院地球化学研究所,贵阳550002 [4]中国石油化工集团公司油田勘探开发管理部,北京100029

出　　处：《矿物学报》2000年第3期305-313,共9页Acta Mineralogica Sinica

摘　　要：本文在充分利用开发检查井全井段取芯 ,研究沉积微相类型的基础上 ,结合密集开发井网的动态资料 ,分析了各种砂体在井间的连通性与平面上的分布规律 ,系统总结了地形、河流与湖泊大小、气候演化与湖面升降对湖泊浅水三角洲沉积动力学过程及其前缘砂体内部结构。On the basis of core information from development inspection wells, different types of sedimentary microfacies could be distinguished. And combining hydrodynamic information from the developing well\|nets, the continuity between wells and planar distribution pattern for different sandbodies could be analyzed clearly. It could be possible to systematically summarize the influence of configuration and size of rivers and lakes, climate changes and lake level fluctuation on the sandbodies at the shallow\|water lake delta front and analyze their sedimentary dynamic process.\; During sedimentation of the middle\|upper layers in the Songliao Basin, the basement descended on the whole, the land and subaqueous land relief was very gentle. Due to gentle relief and large lake area, the lake\|level fluctuation could make the coastal line swing largely and quickly. Changes in width of seasonal and periodic coastal line could reach 20\|50 m. the distributary channels in the delta plain stretch into the lakes over long distances due to acceleration and frequent fluctuation of lake level. So the basic conditions for the formation of shallow\|water delta are the very gentle relief and uniform subsidence. The delta plain is connected smoothly with the wide delta front and pre\|delta, without the topset, foreset and bottomset beds, named the three\|fold structure in the Gilbert delta model.\; Under the conditions of gentle basement, large lake area, relatively arid climate and high frequency and amplitude of lake\|level fluctuation, the small and dispersed shallow\|water delta would be destroyed thoroughly by the coastal and swash\|backwash currents and lake\|waves, thus forming coastal deposits.\; As the rivers become strong in energy, the distributary channels in the delta plain would extend over a long distance to the center of the lake, forming characteristic subaqueous distributary channels. During the lake\|level fluctuation, the hydrodynamics of rivers, lake\|waves and coastal currents might transform the distribut

关 键 词：松辽盆地 三角洲 浅水三角洲 沉积动力学 

分 类 号：P512.2[天文地球—地质学]