Frequency band widening method based on interval transit time curve constraint

The invention discloses a frequency band widening method based on interval transit time curve constraint. According to the method, frequency band is widened based on interval transit time curve constraint, acoustic wave impedance is converted into reflection coefficient by the aid of interval transit time curves extracted from well-logging data, artificial synthetic records are built by the aid of the reflection coefficients and wavelets with different main frequencies, and matching filter operators are extracted from the synthetic records and matched with actual data to obtain seismic data meshed with well records. According to the method, well data information can be considered, data frequency band is furthest widened according to requirements, effective signals can be furthest protected, the method is simple and practical, and the technical advantages of the method are more remarkable as compared with other methods. 本发明为基于声波时差曲线约束的频带拓展方法，基于声波时差曲线约束进行频带拓展，其实质就是利用从测井数据中提取的声波时差曲线，通过声波阻抗转换成反射系数，将反射系数与不同主频的子波相结