嫩江齐齐哈尔段现代网状河沉积研究  

Depositional characteristics of the modern anastomosing river in Qiqihar section of Nenjiang river.

作　　者：谢庆宾[1] 管守锐[1] 薛培华[2] 朱筱敏[1] 王贵文[1] 刘少宾 

机构地区：[1]石油大学 [2]中国石油天然气集团公司石油勘探开发科学研究院

出　　处：《石油勘探与开发》2000年第5期106-108,共3页Petroleum Exploration and Development

摘　　要：因为网状河砂体可作为油气的储集体 ,所以对网状河沉积特征的研究越来越受到重视。国内许多河流发育网状河段 ,作者通过实地挖掘探槽、密集采样 ,重点对嫩江齐齐哈尔网状河段沉积特征进行了详细描述和研究。分析认为 ,嫩江齐齐哈尔段现代网状河是由不断分汊合并的多河道系统及大片泛滥平原 (湿地 )组成的一种河流类型 ;其中发育网状河道、天然堤、决口扇、河间漫滩、湖泊、沼泽、风成沙丘等微地貌单元 ;网状河道的沉积物以沙砾石和中细沙为主 ,发育槽状交错层理和斜层理 ,河道间其它微地貌单元以细粒沉积物为主 ;该区所具有的缓慢沉降背景、低坡降、高的加积速度以及易决口分汊是网状河形成的主要原因。同时 ,在与国外报道的沉积模式进行比较后指出 ,该区网状河特有的侧向迁移、风成沙丘、较大的宽 深比以及船形叠置砂体与Smith所建立的网状河模式存在一定差别。Sandbody of anastomosing river can reserve oil and gas, so more and more petroleum geologists have paid attention to researching its depositiona l characteristics. A lot of rivers have been developed anastomosing river sectio n in China. One of the examples is Qiqihar section, Nenjiang river. The modern anastomosing river in Qiqihar section of Nenjiang river contains low gradient, h igh aggradation rate, multiple channel and large area wetland between the channels. Channels, natural levees, crevasse splay, floodpl ain, lakes, marshes and eolian dunes are important morphological and sedimentary units. Anastomosing channel filling sediments are mainly composed of pebbly san d and medium to fine sands. Internally channel sandbody consists mainly of troug h cross strata and oblique bedding. The other morphological units are mainly co mposed of fine grained sediments. A milieu of subsidence, low gradient, high agg radation rate and easily burst have been the main causes for the anastomosing ri ver in Qiqihar of Nenjiang river. There are obviously differences between the ch aracteristics of the anastomosing river in Qiqihar of Nenjiang river and that of which Smith had described. The characteristics include lateral migration, eolia n dunes, bigger width to depth and sandbody alternated as boat shape.

关 键 词：嫩江齐齐哈尔段 河流 网状河段 沉积特征 模式 

分 类 号：P512.2[天文地球—地质学] P512.31