Discussion on Relative Lacustrine Level Changes of Triassic in Yingmaili Area, Tarim Basin

Taking the Triassic in the Yingmaili area of Tarim Basin as an example, it combined with the traditional qualitative identification of high–resolution sequence and quantitative analysis method of wavelet transform. The sequence division of Triassic in Yingmaili area of Tarim Basin was done by using the data of logging, drilling and core, and the Fischer plots was drawn based on the calculation of super short–term sequence cycles. It turns out the law that the relative lacustrine level changes were integrally from a long–time lacustrine regression to a long time lacustrine transgressive and rose the largest during the SQ4. The complete lacustrine transgressive and lacustrine regression of Triassic was corresponded well to the long–term sequence cycles. Compared with integrated analysis, we find the lacustrine level changes is closely related with vertical evolution of sedimentary facies. This study clarifies the law of lake level changes of Triassic in Yingmaili area and its evolution relationship with sedimentary facies belt, which provides a basic basis for subsequent geological research.