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《Progress In Geophysics》 2005-04
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Relationship among compressional wave,shear wave velocities and density of rocks

MA Zhong-gao~(1,2),XIE Jie-gao~(2) (1.Chengdu University of Technology,Chengdu 610059,China;2 Institute of Geophysical Prospecting,SINOPEC,Nanjing 210014,China)  
The ultrasonic compressional and shear wave velocities in rock that is under various temperature and pressure conditions and density were measured in laboratory on 237 samples to be belonged four different lithologies from Tertiary formation in the Jiyang Sag,with porosities from 2 to 27 percent.The relationship of compressional and shear velocities and the pressure and the temperature is obtained according to the data meassured on the condition of different temperatures and pressures,then the measured elastic parameters under the condition of high temperature and pressure are converted into thoses on the 60 Mpa in pressure,finally the relationship of density,V_p and V_s data is analysed.Our laboratory data show that V_s is linearly related to V_p,and we obtain the relationship between density and V_p.In the meantime the relationship between V_p and V_s is incorporated Gardner's relation,Gardner's relation is generalized to ρ=CV~(A)_pV~(B)_s(called generalized Gardner relation).The new relationship among density,V_p and V_s isρ= 1.575 8V~(0.2879)_pV~(0.0197)_s.In the paper having discussed,the function of this new relation in V_s prediction,rock physics modeling and AVO forward and inversion et al.,then pointed out these rule can serve as oil exploration and exploitation.
【Fund】: 中国石油化工股份有限公司重点科技攻关基金(P01062)资助
【CateGory Index】: P631
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