THE APPLICATION OF STEP-BY-STEP MULTI-DOMAIN NOISE SUPPRESSION OF HIGH-DENSITY 3D3C DATA
LIU Yu-ping1,2, DING Fei-hao1,2, PAN Wei-guo3
1. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China; 2. Guangzhou Marine Geological Survey, Guangzhou 510760, China; 3. Research Institute of CNOOC Shenzhen Co., Ltd., Guangzhou 510240, China
Abstract：In the light of the processing requirements of the high-density wide-azimuth 3D3C seismic data and in consideration of the difference between the signal and the noise in such aspects as type,time,frequency,data field,processing step and surface area,the authors chose the means of multi-domain step-by-step de-noising.Under the prerequisite of not damaging the effective signal,the cross arranged cone wave filter was adopted first to remove surface wave and linear noise,then the low-frequency noise compilation was employed to remove residual surface wave and low-frequency noise,followed by frequency division de-noising for removing various kinds of random noise.At last,the refraction wave was removed.The monitoring display of single shot record and stacking profile has proved the effectiveness of this method and the improvement of the signal-to-noise ratio.
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