The time difference curve may confirm the fast formation ; judge the tool ' s centrality ; verify the bonding quality combining with cbl / vdl curves , and also determine the casing collar position , etc 時差曲線則可以根據(jù)時差的大小驗證快速地層;由曲線的變化幅度判斷儀器在井中的居中程度;結合首波的幅度曲線波列的變密度曲線驗證膠結狀況是否良好;利用時差曲線的變化確定套管接箍位置等。