Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 113-116.doi: 10.3969/j.issn.1673-8926.2016.05.014

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Quantitative study of the effect of cavern width on reflection amplitude of migration section

Li Fanyi1， Di Bangrang2， Wei Jianxin2， Xu Jianyong1， Wu Aijun1， Kang Bo1   

  1. （1. CNOOC Research Institute， Beijing 100028， China； 2. State Key Laboratory of Petroleum Resource and Prospecting， China University of Petroleum， Beijing 102249， China）
  • Online:2016-09-29 Published:2016-09-29

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Abstract:

 In recent years, a phenomenon that reflection amplitude of migration section increases with the cavern width was proposed in researches about the seismic response of carbonate cavern reservoir. Based on the concept of spatial wavelet, the relationship between reflection amplitude of migration section and the width of geological body was discussed by analyzing the horizontal trace amplitude function of horizontal geologic body derived from the focal beam theory, and the results from the theoretical study were verified through numerical and physical seismic forward modeling experiments. The result shows that when the geologic body width is less than the critical width of amplitude, the reflection amplitude of migration section increases with the width of geologic body, and when the geologic body width is larger than the critical width of amplitude, the influence of geologic body width on reflection amplitude of migration section is weakly. The critical width of amplitude is proportional to the seismic wavelength, and is inversely proportional to the sine of the maximum emergence angle. In practical, the critical width of amplitude can be obtained by seismic forward modeling. This research is favorable for the quantitative study of seismic amplitude of small geologic bodies.

Key words: sedimentary characteristics, favorable reservoirs, the upper submember of the third member of Shahejie Formation, the lower submember of the first memeber of Shahejie Formation, Lixian Slope

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