摘要:
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.
Abstract:
The analysis of sediment source has vital significance to the sedimentary area, reservoir characteristics and tectonic evolution. Based on the analysis of detrital composition, lithic type, heavy mineral assemblage, cathode luminescence, REE and seismic data, the provenance of Eboliang region in Qaidam Basin during the Paleogene has been specifically studied. The provenance of Eboliang No.Ⅰ structure mainly comes from the Altyn Tagh Mountain in the north. The Dongping structure belt in the west and Eboliang No.Ⅰ structure have relatively independent provenance. Eboliang No.Ⅱ structure is in mixed provenance area, which is influenced by two source directions. The main provenance is from the Altyn Tagh Mountain in the north through Eboliang No.Ⅰ structure. One of the other is from Xiaosaishiteng Mountain in the northeast of the study area through Lenghu No. 3, 4 and 5 structures. Provenance of Eboliang No.Ⅲ structure mainly comes from Saishiteng Mountain in northeast of study area through Lenghu No.6 and Lenghu No.7 structures without the influence by ancient Yuka largh fluvial-dominated delta from Nanbaxian direction.
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