Comparative analysis of stereo and planar sources for slope breaks
CHEN Feng-Ying1,2(), WANG Xiang-Chun2, SUN Jian3, LI Can-Ping1, REN Xiao-Qing4
1. School of Electronics and Information Engineering,Guangdong Ocean University,Zhanjiang 524088,China 2. School of Geophysics and Information Technology,China University of Geosciences (Beijing),Beijing 100083,China 3. Data Processing Center(Zhanjiang),Geophysical Research Institute,Geophysical Services,China Oilfield Services Limited,Zhanjiang 524057,China 4. Sinopec Green Energy Geothermal Development Co.,Ltd.,Baoding 071800,China
Deep-water areas have gradually become the exploration targets of offshore oil and gas resources.Due to the intricate geological conditions of these areas,seismic imaging of moderately deep reservoirs suffers low signal-to-noise ratios and resolution,inevitably affecting the exploration and exploitation of oil and gas resources.To improve the quality of seismic data of moderately deep reservoirs in deep-water areas,this study first acquired seismic data at the same location in a slope break using stereo and planar sources under the same acquisition parameters.Then,after being processed using the same workflow,the seismic data were subjected to comparative analysis from the perspective of wavelets,shot gather spectra,near-trace spectra,superimposed profile spectra,and final imaging.The results indicate that the wavelets of a stereo source outperformed those of a planar source in terms of energy intensity and ghost reflection interference.Moreover,for moderately deep reservoirs of the deep-water area,a stereo source exhibited broader frequency bands and especially rich frequencies within 30~80 Hz.These features enhanced the resolution of seismic profiles and the imaging quality of seismic data.Thus,compared to planar sources,stereo sources enjoy more advantages in improving seismic imaging of moderately deep reservoirs in deep-water areas.Therefore,stereo sources can be employed to acquire seismic data of moderately deep reservoirs with complex geological conditions in deep-water areas,and the purpose is to improve the imaging quality of seismic data.
Feng-Ying CHEN,Xiang-Chun WANG,Jian SUN, et al. Comparative analysis of stereo and planar sources for slope breaks[J]. Geophysical and Geochemical Exploration,
2024, 48(2): 461-469.
The wavelet comparison between the three-dimensional source and the planar source a—time domain waveform diagram;b—spectral diagram
Direct wave data and the comparison of extracted wavelet in time-frequency domain a—stereoscopic source data;b—planar source data;c、d—wavelet and its spectral extracted in direct wave respectively
Comparison of submarine data and extracted wavelet in time and frequency domains a—stereoscopic source data;b—planar source data;c、d—direct wave extraction wavelet and spectral diagram,respectively
Data and spectrum of the shot set after decontamination a—three-dimensional source gun set in shallow water;b—planar source gun set in shallow water;c—three-dimensional source gun set in deep water;d—planar source gun set in deep water;e—shallow water and shallow layer spectrum;f—shallow water and deep layer spectrum;g—deep water and deep layer spectrum;h—deep water and shallow layer spectrum
Spectrum analysis of short-pass data a—short cut profile and the location of A shallow water and shallow layer,B shallow water and deep layer,C deep water and deep layer,D deep water and shallow layer;b—shallow water and shallow layer spectrum;c—shallow water and deep layer spectrum;d—deep water and deep layer spectrum;e—deep water and shallow layer spectrum
Spectrum analysis of short-pass submarine data a—short-pass profile;b—stereoscopic source spectrum;c—planar source spectrum
Spectrum analysis before migration a—overlay section and the location of A shallow water and shallow layer,B shallow water and deep layer,C deep water and deep layer,D deep water and shallow layer;b—shallow water and shallow layer spectrum;c—shallow water and deep layer spectrum;d—deep water and deep layer spectrum;e—deep water and shallow layer spectrum
Spectrum characteristics of stereoscopic source and planar source in shallow water and deep water a—offset profile;b—spectrum at position 1;c—spectrum at position 2
Imaging profile of stereoscopic source(a) and planar source(b) and imaging spectrum characteristics of stereoscopic source and planar source(c)
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