UNDULATION ANALYSIS SERVED AS A NEW METHOD TO THE PALEOSTRESSPFIELD STUDY OF A SEDIMENTARY BASIN

The method of the Undulation Analysis believes that the evolutionary process of a depositional basin is controlled by different cyclic waves.Practical application shows that there are differences between the same types of cyclic waves in the different regions of a basin.In this paper,the causes which result in such differences have been analysed,and the research thinking and method using the differences to solve the paleostressfield problems of basin are suggested.The restoration of Tertiary paleostressfield in the Qaidam Basin by means of this method indicates that the compressive stress spreads from SW220°to NE40°