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沉积学报  2015 

柴达木盆地鄂博梁地区古近系沉积物源方向分析

DOI: 10.14027/j.cnki.cjxb.2015.04.003, PP. 649-658

Keywords: 柴达木盆地,鄂博梁,物源分析,古近系

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Abstract:

分析沉积区物源方向对研究该区的沉积作用、储层特征以及构造演化等方面具有重要的意义.为了查明柴达木盆地鄂博梁地区古近系沉积物源方向,本文对研究区碎屑岩的碎屑组分、岩屑类型、重矿物组合特征、稀土元素特征和阴极发光特征的平面分布特征进行分析,结合地震资料,确定研究区古近系沉积物源.综合分析得出鄂博梁Ⅰ号构造带物源主要来自于北部的阿尔金山物源区,西部的东坪构造带与鄂博梁Ⅰ号构造带具有相对独立的物源;鄂博梁Ⅱ号构造带属于混源区,同时是受到两个方向物源影响,分别是北部的阿尔金山方向,即来自于鄂博梁Ⅰ号构造带,是主要的物源区,来自东北部的小赛什腾山经冷湖三号、四号和五号构造带方向的物源,为次要物源区;鄂博梁Ⅲ号构造带主要是来自东北部赛什腾山经冷湖六号和冷湖七号构造带方向的物源,不受到南八仙方向的“古鱼卡大型古河流三角洲”物源的控制.

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