Patent ID: 11880012
Assignee: CHINA NATIONAL PETROLEUM CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The method for extracting a downgoing wavelet and attenuation parameters from VSP data according to claim 1, wherein performing, based on the parameters obtained from the wavelet-corrected multi-trace downgoing P-wave log spectrum, the amplitude correction and the inverse FFT on the FFT transformed downgoing P-wave data to obtain the downgoing wavelet, comprising:
correcting, based on the parameters of the wavelet-corrected multi-trace downgoing P-wave log spectrum, real and imaginary parts of the FFT transformed downgoing P-wave data, to obtain corrected downgoing P-wave data;
determining a valid frequency band of the corrected downgoing P-wave data;
performing ramp processing on data points within a preset range and outside the valid frequency band;
performing zero-clearing processing on downgoing P-wave data outside the valid frequency band and the preset range to obtain final downgoing P-wave data; and
performing an inverse FFT on the final downgoing P-wave data to obtain a downgoing wavelet.