Research and application of spectral inversion technique in frequency domain to improve resolution of converted PS-wave
Zhang Hua1,2,3,4, He Zhen-Hua1,2, Li Ya-Lin3,4, Li Rui1,2, He Guamg-Ming3,4, and Li Zhong3,4
1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China.
2. College of Geophysics,Chengdu University of Technology, Chengdu 610059, China.
3. Geophysical Exploration Company, Chuanqing Drilling Engineering Co.Ltd., CNPC, Chengdu 610213, China.
4. Mountain Geophysical Technology Test Center, CNPC, Chengdu 610213, China.
Abstract：
Multi-wave exploration is an effective means for improving precision in the exploration and development of complex oil and gas reservoirs that are dense and have low permeability. However, converted wave data is characterized by a low signal-to-noise ratio and low resolution, because the conventional deconvolution technology is easily affected by the frequency range limits, and there is limited scope for improving its resolution. The spectral inversion techniques is used to identify λ/8 thin layers and its breakthrough regarding band range limits has greatly improved the seismic resolution. The difficulty associated with this technology is how to use the stable inversion algorithm to obtain a high-precision reflection coefficient, and then to use this reflection coefficient to reconstruct broadband data for processing. In this paper, we focus on how to improve the vertical resolution of the converted PS-wave for multi-wave data processing. Based on previous research, we propose a least squares inversion algorithm with a total variation constraint, in which we uses the total variance as a priori information to solve under-determined problems, thereby improving the accuracy and stability of the inversion. Here, we simulate the Gaussian fitting amplitude spectrum to obtain broadband wavelet data, which we then process to obtain a higher resolution converted wave. We successfully apply the proposed inversion technology in the processing of high-resolution data from the Penglai region to obtain higher resolution converted wave data, which we then verify in a theoretical test. Improving the resolution of converted PS-wave data will provide more accurate data for subsequent velocity inversion and the extraction of reservoir reflection information.
. Research and application of spectral inversion technique in frequency domain to improve resolution of converted PS-wave[J]. APPLIED GEOPHYSICS, 2017, 14(2): 247-257.
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2017, Vol. 14 
