Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (5): 1550-1560.doi: 10.13278/j.cnki.jjuese.201605303

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Influence Factors and Strategy of Inversion for Density of Acoustic Full Waveform Inversion with Variable Density

Zhang Guangzhi, Sun Changlu, Pan Xinpeng, Zhang Zhiming, Jiang Lanjie, Yin Xingyao   

  1. School of Geosciences, China University of Petroleum(Eastern China), Qingdao 266580, Shandong, China
  • Received:2016-01-08 Online:2016-09-26 Published:2016-09-26
  • Supported by:

    Supported by the State Key Development Program for Basic Research of China (2013CB228604, 2014CB239201) and Major National Oil and Gas Projects(2016ZX05027004-001,2016ZX05002-005-09HZ)

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Abstract:

The density can be used to predict saturation of reservoir fluid, obtaining the reliable density parameters has become an important consideration for full waveform inversion. In order to get more stable result of density, this paper studied the effecting factors for density from four aspects: frequency, the initial model of velocity and density and simultaneous inversion with density and velocity. According to the research results,this paper had get relatively stable inversion strategy: velocity is inversed with fixed density and then the wave equation is got without density, thus the accurate velocity model can be obtained. When the inversed velocity is treated as initial velocity model, the velocity and density can be simultaneously inversed which might reduced the effect of velocity on density better. The tests of theoretical model had shown the validity of this strategy.

Key words: variable density, full waveform inversion, frequency

CLC Number: 

  • P631.4

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