Gao Jinghuai, Liao Zuwen, Chen Wenchao
(School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract: 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.
Keywords: high resolution seismic data; instantaneous frequency; analytic signal; filter