GEOLOGIC QUALITY FACTOR INVERSION METHOD

摘要

Provided is a method for performing layer Q factor inversion by using an amplitude spectrum attribute of a downlink wave of vertical seismic profile data in a geophysical exploration data processing technology. In the method, first an F-K (frequency-wave number) method is used to perform wave field separation on VSP original data, so as to obtain a downlink wave; a downlink sub-wave and a monitoring sub-wave are selected to undergone Fourier transform to obtain an amplitude spectrum, polynomial fitting is performed on the amplitude spectrum to obtain an equivalent Q, and a formula between the equivalent Q and a layer Q is used to perform inversion, so as to obtain the layer Q. The method has a strong capability of resisting random disturbance, and is capable of removing a difference of triggering sub-wave. The algorithm is simple and can greatly save workload; moreover, the layer Q value obtained through inversion has a desirable stability and high precision.