内蒙古银额盆地查干凹陷构造-层序-沉积特征、盆地原型及其成因机制

Tectono-sequence-sedimentary characteristics,basin prototypes and their genetic mechanisms in Chagan sag of Yin-E Basin, Inner Mongolia

通过对钻井、测井、三维和二维地震资料的综合研究,将内蒙古银额盆地查干凹陷白垩系至新生界划分为2个一级层序、4个构造层序、6个超层序和11个层序。根据等时层序格架下各层序单元内部的沉积充填演化特征,建立了不同级次构造成因层序的构造-层序关系。在此基础上,结合构造应力机制研究和区域构造应力场演化,采用平衡剖面技术解析查干凹陷的构造-沉积史,将该凹陷的构造和沉积演化序列划分为4个一级构造-沉积演化阶段和若干二级、三级构造-沉积演化阶段,进而分析了各构造-沉积演化阶段的构造和沉积特征、凹陷原型的性质及成因机制。

Through comprehensive research on the well-drilling, well-logging, 3D and 2D seismic data, strata from the Cretaceous to Cenozoic in Chagan sag of Yin-E Basin, Inner Mongolia, was divided into two first-order sequences, four tectonic sequences, six super sequences and eleven sequences. Ac- cording to the evolution characteristics of sedimentary filling of different sequence units in the isochronoussequence frameworks, the tectono-sequence relationship of different-order tectono-genetic sequence was established. Based on this, and combined with the study of tectonic stress mechanism and the evolution of regional tectonic stress field, and using the balanced section technique to analyze the tectono-sedimentary history of Chagan sag, the tectono-sedimentary evolution succession of the sag was subdivided into four first-order tectono-sedimentary evolution stages, several second-order and third-order tectono-sedimentary evolution stages. And then the tectonic and sedimentary characteristics, the nature and genetic mecha- nisms of the sag prototypes during different tectono-sedimentary evolution stages were discussed and ana- lyzed.