Restoration method of Ordovician weathering crust paleo-geomorphology of Leshan-Longnv temple paleohigh and its features in central Sichuan

Weathering crust paleogeomorphology is closely re- lated with karst reservoir and paleogeomorphological trap. The development and evolvement to karstification of car- bonatite crust of weathering are obviously controlled by palaeogeomorphology conformation at that time,while the flow direction of cavern water of earth's surface and inter- stratal are controlled by palaeogeomorphology,and then the development of hole and cavern in the karstification zone of carbonatite crust of weathering is also controlled. Undergoing the weathering dedudation of 120Ma from Ca- lidonian to Hercynian period,Karstification is very devel- oped in Leshan-longnv temple,and the Ordovician reser- voir space is reformed from secondary dissolution pore. Considering the strata characteristics,this paper selects appropriate layers to restore the karst paleogeomorpholo- gy by using copying method,and then divides karst land- form into three paleogeomorphological units,namely height,slope and depression and some other sub-units. The features of each unit are analyzed at the same time.