Analysis on Mesozoic subsidence history of northeast Yishan slope of Ordos basin

The eroded stratum is used to estimate the subsidence history of that area after Triassic in Mesozoic of northeast area in Yishan slope.The BasinMod 1-D software of the PRA company is adopted,and the backstripping technology is used to simulate the subsidence history of Yulin area.Moreover the curve of subsidence history is protracted.The result shows that there are 4 stages of subsidence and 4 stages of uplift in the research area since Permian.The subsidence range was most severe in lower Cretaceous with the speed of subsidence as 57.00 m/Ma;the strongest uplift subsidence event in whole basin was happened in Late Cretaceous since Triassic with the largest subsidence thickness up to 1 100 m. Due to the effect of gradually uplifting during the Yanshan movement,the subsidence center is transferred from east to west since early Jurassic and finally to the west of the L(?)liang Mountains.The structural tilt-lift occurred at east L(?)liang Mountains,resulting in the present structural framework of Ordos basin.