On the methods of instantaneous frequency estimate for high resolution seismic data

To improve the estimate precision of the high resolution seismic data instantaneous frequency (IF) and so much the better show the strata characteristics, such as rock properties, subsurface structure and the extending of oil gas, a new method of seismic data IF estimation based on the finite impulse response filters having maximally flat frequency response was proposed. The new method calculates the IF from analytic signals corresponding to seismic data by these filters, but the traditional method does it by second-order central finite difference (CFDM). The comparison of the new method with the CFDM shows that: in estimating the IF of the signal with 30 Hz dominant frequency and a Gaussian amplitude modulation, in the center point, the absolute error decreases by 98.4%; in analyzing the thin interbed seismic data, the structural details in the thin interbed can be depicted much more better; in processing the practical seismic data, the extending of the thin bed and the contacting of the strata can be clearly shown.