井孔声场计算中的黎曼叶选择

The Choice of Riemann Sheets in the Calculation of the Borehole Acoustic Waves

针对耗散介质地层模型和双相介质地层模型，给出频率-波数域井孔声场函数Φ1(r,ω，k）在k实轴上满足辐射条件的单值定义，确定在积分围道上和围道内Φ1(r，ω,k)所在的黎曼叶．同时，澄清了首波分析中的一些概念．

The borehole acoustic potential in the frequency-wavenumber domain di, (r,co,k) is a multivalue function of the axial wavenumber k- By imposing the radiation condltion and analytic continuation, di, (r, co,k) is slngle-valued on the complex k plane. The lossy solid formation model and the poroelastic formation model are studied. Some confusing concepts in head wave analysis are clarified.