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Diffraction separation in dip-angle domain based on Gaussian beam migration |
KONG Xue1, LI Zhenchun2, LI Cui3, LIU Dan1, LI Xiao1, YANG Jianlei1
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(1.College of Petroleum Engineering in Shengli College China University of Petroleum, Dongying 257061, China;2.School of Geosciences in China University of Petroleum, Qingdao 266580, China;3.Drilling Technology Research Institute of Shengli Oilfield Service Corporation, Dongying 257000, China)
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Abstract: |
Heterogeneous objects such as faults and fracture-cave cubes cause diffractions in seismic records. After conventional seismic processing, diffractions are usually buried in one-way reflections. Separating diffractions can improve the interpretation accuracy of heterogeneous objects. Common imaging gathers (CIGs) in dip-angle domain can be used to separate wavefield, because diffractions are quasi-linear and reflections are quasi-parabolic in the CIGs. We use Gaussian beam migration to gather dip-angle domain CIGs, and separate diffraction based on semblance analysis. Model tests show that semblance analysis suppresses reflections but preserves diffractions in dip-angle domain CIGs after wavefield separation. Diffraction imaging results together with full wave imaging can thus enhance interpretation accuracy. |
Key words: Gaussian beam migration dip-angle domain common imaging gather diffraction separation semblance analysis |
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