Analysis on inversion structures characteristics and coal control action in north margin of Qaidam Basin

According to close relationship existed between structure and coal seam occurrence state in North Qaidam Basin, in order to further understanding the C oal controlling of inversion structures, based on the principle of inversion structures, the inversion structure of the geological sections were identified in typical coal min e areas of different tectonic divisions in North Qaidam Basin by using balanced section technology, the coal controlling in the evolution process of inversion structure w as also discussed briefly. The results showed that it was widely recognized by researchers that the study area occurred positive inversion structure during the late Juras sic and Cretaceous period, and the research was in short of samples for coal mines with adequate geological research and relevant analysis on the function of coal con trolling. Through identifying the inversion structure on selected geological sections with high geological control degree, the time limit for inversion of each tectonic partiti on was further determined as late Jurassic epoch. The coal controlling can provide space for the function of coal forming before the inversion of structures, and also ca n make the good coal measures and the hanging wall of coal seam become shallow after inversion.