Some new imaging formulas for seismic reflection wave and their theoretical
basis are given. Phenomena of wave propagation should be characterized by
instantaneous spectrum and expressed by complex function of three variables
(time, space and frequency) in mathematics. Various physical parameters of
medium are also complex functions of two variables (space and frequency).
The relationship between reflection coefficient of medium and spectrum of r
eflected wave is given. Multi-reflection and filter of formations are consi
dered in inversion formulas. Problems in classical convolution model and wa
ve equation are illustrated. All these inversion formulas can be used to im
age underground medium by wavelet transform and method of "3-basic colors".
Different colors mean different media.