Using seismic geomorphology to characterize paleo-karst landforms

Based on seismic plane imaging techniques and geometrical attribute analysis technique, and directed by modern sediment and geomorphology research results, the seismic geomorphology discloses the strata sediment and evolution laws through seismic plane images in different isochrohal frame in order to acquire more information on sediment strata through seismic images. By using the research flowchart and auxiliary techniques in seismic geomorphology and integratedly applying the seismic geometrical attribute extraction technique and plane imaging technique, the Ordovician carbonate paleo-karst landforms in Fuxian County, east of Ordos Basin were described and analyzed in this paper. The plane distribution of the dendritic draining groove with different scales were quantitatively described. The research results indicate that the Ordovician paleo-karst landforms in this area show higher elevation in the west and lower elevation in the east, the residual thickness is thicker in the east and thinner in the west, the paleo-karst landforms mainly distribute in the middle west, a few in the northeast, a valley was developed in the northwest of the area, its width is about 300~860 m, cutting depth is 20~45 m, it extends from west to the southeast and it branches to two sub-valleys, beside the main valley many branch valleys were developed, but they do not extend too long, the other parts of the area are positive landform unit section or the plain, the color changing of the curvature delineate every kinds of hammock in detail.