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《Geophysical Prospecting for Petroleum》 2012-01
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Application of rock physical model in S-wave velocity estimation

Xie Yuefang,Zhang Ji.Institute of Sinopec Shanghai Offshore Oil & Gas Branch Company,Shanghai 200120,China  
Rock physical model is an important basis of petrophysical research and S-wave velocity estimation.Based on Xu-White sand-clay mixed model,by using core testing data,P-wave and density log,clay content and porosity measurement,we calculated bulk and shear modulus of dry rock;then,the effective elastic modulus in different fluids with different saturation was calculated;finally,the P-wave velocity and S-wave velocity were computed.By comparison with actual density and P-wave data,we constantly modified parameters and carried out iterative computation.By this means,the S-wave velocity can be obtained.Through S-wave velocity estimation by using rock physical model,the problem of missing S-wave data in conventional logging data of Fangheting structure in Pinghu Gasfield was solved,which provided reliable basic data for AVP forward modeling and pre-stack AVO/AVA simultaneous inversion.
【CateGory Index】: P631.4;P618.13
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