Abstract: Asymmetrically alternant movement of half-horst in Muglad Basin is accomplished by accommodation zone. By analyzing types, structure styles and distributing characteristics of accommodation zone in Muglad Basin, it indicates that accommodation zone is a long and continuous inherited developed structure, which always controls the distribution of sandbody and is adjacent to oil-generating sag which is a favorable zone for oil/gas migration and a favorable target for oil/gas exploration. In recent years, several significant discoveries have been made in this basin related to accommodation zone and certain size of profit reserves have also been found continuously. There is a favorable prospect in accommodation zone of Muglad Basin.

Key words: half-horst, half-graben, accommodation zone, oil/gas exploration