Burial Dissolution Characteristics and Developed Models of Tazhong Uplift with Upper Ordovician

The paper studies factors of carbonate burial dissolution with Upper Ordovician of Tazhong Uplift,such as the geological background,generation history,identification sign,porosity type,origin of acidic fluid,orientation and passageway of movement.It further analyzes the forming mechanism and development models.Fractures and pores in the period of bury are divided into selection and non-selection,including corrosion enlargement structure fractures,corrosion enlargement pressure fractures,corrosion pores and corrosion enlargement pores.The fracture close to Tazhong1 develops better,the late Paleozoic-Mesozoic manifests the expansion dissolution of pore layer,and Cenozoic manifests the beads-strings dissolution fractured holes.The research of Karst period after burial dissolution and denudation seam hole developmental pattern gives certain guidance for the exploitation in the area.