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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
(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)
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