///On the bases of the brief introductions of the concept, methods, principles and flow sheet, taking Lower Ordovician Yingshan Formation reservoirs in Tazhong 5-7 well block of Tarim Basin as an example, the forward analysis and inversion of the elastic wave impedance for the individual well are conducted, and moreover the recognizing studies on the gas and water are caught out. In addition, the exploring researches on the application of the above inversion in the fluid detection of carbonate reservoirs are engaged. The practice shows that the inversion can be adopted in the gas and water recognitions in carbonate reservoirs and furthermore the above predicted results are coincident with the those of drilling and exploration.