ZHOU Ya tong 1;DONG En qing 1;HE Zhen hua 2 [WT5;

• 1:5”BZ](1 Xi′an Jiaotong University
• 2:Xi′an 710049
• 3:China
• 4:2 Chengdu University of Technology

Abstract：

Based on the seismic positioning principle we can do 3D prestack forward modeling by one way acoustic wave equation in complex geological conditions.This method has very high caculating efficiency and hasn't multi reflections in the seismic records.But unsuitable velocity in model usually result in frequency and wave number's lossing of wave field that cause wave field's aberration and reduce quality of seismic forward records.This paper proposes wave field replacement technology which uses new wave field formed by zero phase wavelet to replace old aberrant wave field and keep old one's dynamical and spacial characteristic at the same time.It is very suitable to use this technology in 3D prestack forward modeling because the wave field of focus and receiver's response are similar in shape and every trace's amplitude envelope in wave field only has one extreme value.The simulation shows that the record's quality is improved when using wave field replacement technology.

Key Words： D prestack forward modeling;positioning principle;one way equation;wavefield replacement;frequency and wave number lossing

Abstract:

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Foundation: 国家自然科学基金资助 !(No.49894190 - 30 )

Authors: ZHOU Ya tong 1;DONG En qing 1;HE Zhen hua 2 [WT5;

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