Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 118-124.doi: 10.3969/j.issn.1673-8926.2014.03.019

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Seismic wave reverse-time migration noise analysis within different common imaging point gathers

CHEN Keyang1， WU Qingling1， FAN Xingcai1， CHEN Shumin1， LI Lailin1， LIU Zhenkuan2   

  1. 1. Research Institute of Exploration and Development， PetroChina Daqing Oilfield Company Ltd.， Daqing 163712，Heilongjiang， China； 2. Company of Exploration， PetroChina Daqing Oilfield Company Ltd.， Daqing 163453， Heilongjiang， China
  • Online:2014-04-06 Published:2014-04-06

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Abstract:

There are two kinds of common imaging point gathers of the seismic imaging methods, one is the common imaging point offset gather, and the other is common imaging point angle gather. We carried out numerical experiments on the wave field characteristics and difference of two kinds of common imaging point gathers with relation of seismic wave reverse-time migration method. Taking tilted interface model and complex Marmousi model as examples, we composed two kinds of common imaging point gathers, of which the angle gather was made up by using Poynting vector during the reverse-time migration process. The computational results show that both the two kinds of common imaging point gathers are flat with correct velocity model. The noise distribution in the offset gather is not fixed, therefore, so it is not suitable for refining processing afterward, while the migration noise of the angle gather is almost focused on higher angle gather area, and with the branch angle stack processing, the low angle stacking section has the better S/N and the formation information is improved greatly. What’s more, the low frequency noise energy is positive proportional to the reflection coefficient of the interface.

Key words:  sedimentary microfacies, diagenesis, reservoir characteristics, He 8 member, Shan 1 member, Ordos Basin

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