Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 91-97.doi: 10.12108/yxyqc.20180410

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Grid tomography based on well-to-seismic integration in anisotropic velocity modeling and its application

HAN Linghe, HU Ziduo, FENG Huiyuan, LIU Wei, YANG Zhe, WANG Yanxiang   

  1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2017-09-13 Revised:2018-01-16 Online:2018-07-21 Published:2018-07-21

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Abstract: Estimation of anisotropic velocity and parameter is a key technology in the success of anisotropic prestack depth migration in real seismic data processing. It is one of the commonly used methods to calculate the anisotropic parameters by well-to-seismic integration for seismic data processing at present. The conventional well-to-seismic integration method can be used to obtain anisotropic parameters by comparing the formation thickness,but the accuracy is low and cannot meet the geological requirements. Grid tomography based on wellto-seismic integration was applied to anisotropic velocity modeling in 3D VTI media. The anisotropic velocity and parameters of each grid were updated along the ray path,and the accuracy of velocity model was further improved by iterative calculation. The application results show that compared with conventional well-to-seismic integration method,grid tomography based on well-to-seismic integration can greatly improve the precision of anisotropic velocity and parameters and enhance the consistency of depth migration results and well logging data. Moreover,the common imaging point gather of long offset is more flatten,which can provide more information of long offset for prestack inversion, and the local imaging effect of the migration results is also improved effectively.

Key words: low permeability reservoir, CO2 huff and puff, concentration diffusion, fluid property heterogeneity, stress sensitivity, well test model

CLC Number: 

  • P631.4
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