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

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. According to the evolution characteristics of sedimentary filling of different sequence units in the isochronous sequence 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