潮湿扇、河流、湖泊沉积体系及其沼泽沉积特征--以焉耆盆地为例

目的为讨论潮湿扇、河流、湖泊沉积体系中沼泽的沉积特征,确定沼泽的沉积模式。方法依据相标志,采用沉积体系分析法。结果潮湿扇、河流和湖泊沉积体系是焉耆盆地的主要沉积体系类型,它们形成于中晚三叠世至中侏罗世的小泉沟、八道湾、三工河、西山窑和头屯河期;其中的河流沉积体系和湖泊沉积体系较为发育,河流沉积体系分为辫状河和曲流河两种类型。结论在潮湿气候条件下形成的潮湿扇、河流和湖泊沉积体系富含煤层、碳质泥岩和灰黑色泥岩,各类沼泽沉积发育,从而形成了该区较为发育的扇沼-河沼-湖沼沉积模式。

The damp fans, rivers and lakes sedimentary systems and the deposit of fan march, river marsh and lake march: taking Yanqi Basin as an example

Aim To make sure the march sedimentary feature of The damp fans, rivers and lakes sedimentary systems , define the sedimentary model of march. Methods According to facies mark, utilized analysis means of sedimentary system. Results The damp fans, rivers and lakes are main sedimentary systems in Yanqi Basin. They are formed from T2-3 to J2, including Xiaoquangou, Badaowan, Sangonghe, Xishanyao and Toutunhe age. The rivers and lakes sedimentary systems are good development. The rivers sedimentary systems are divided into braided stream and meandering stream. Conclusion The damp fan sedimentary systems, river sedimentary systems and lake sedimentary systems contain rich coal seam, carbonaceous mudstone and greyish black rhudstone in damp climate. Different types of march are good development. Therefore the sedimentary model of fan march-river marsh-lake march are formed in this area.