Wave Field Separation Based Reverse Time Migration Imaging Condition and It′s Application in Junggar Basin
Received date: 2011-11-23
Revised date: 2012-01-26
Online published: 2012-06-10
Two-way wave field based reverse-time migration (RTM) has advantage to form the image in the steeply dipping structures and complex geological background,compared with the depth migration imaging. Generally,three steps are required for the reverse-time migration as follows:①Forward extrapolation of earthquake source wavefields in time domain;②Backward extrapolation of receiver wavefields in time domain;③Using the effective imaging condition to construct image. The cross correlation imaging conditions are used to construct image in practical application. The low-frequency and high-amplitude noises occurs in the reverse-time migration imaging by using the cross correlation imaging conditions,the noises can usually contaminate the signals so that the shallow structure overridden by noses can not be identified. The bandpass filtering does not filtrate the noses effectively. In this paper,a new image condition of wave field separation based reverse time migration imaging condition is used to remove the noises effectively. We use the synthetic seismic data from Marmousi velocity model to verify the accuracy of this method. The reverse-time migration imaging is tested in the Junggar basin and the tested results show that the wave field separation based reverse time migration imaging method is reliable.
Key words： Cross-correlation; Low-frequency noise; Junggar basin; RTM; One-way wave.
XU Xing-rong,WANG Yu-chao,HU Zi-duo,LIU Wen-qing,LV Bin, HAN Ling-he,YANG Zhe . Wave Field Separation Based Reverse Time Migration Imaging Condition and It′s Application in Junggar Basin[J]. Natural Gas Geoscience, 2012 , 23(3) : 602 -606 . DOI: 10.11764/j.issn.1672-1926.2012.03.602
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