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《Progress in Geophysics》 2012-01
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P-wave elastic impedance in fractured HTI media

WANG En-li1,CHEN Qi-yan1,DOU Xi-ying2 (1.Research Institute of Petrochina Exploration & Development(Northwest),Lanzhou 730020,China; 2.College Of Geoexploration Science & Technology,Jinlin University,Changchun 130026,China)  
Anisotropy is a very important property in fractured reservoirs and caused by crack development.However,explicit functional relations between anisotropic elastic impedance and crack parameters haven't been built up in pre-stack elastic impedance inversion for these reservoirs.In this article,we review the isolated parallel penny-shaped cracks model and linear slip model,and introduce crack fillings,distribution density and the square of vs/vp of wall rocks into HTI elastic impedance equation.The numerical simulation results show that elastic impedance are influenced by these three parameters in obvious different ways: EI for the cracked gas-filled media changes more with the variations of crack density,while the cracked fluid-filled ones are more sensitive to the variations of vs/vp.The above conclusion may be beneficial to fracture reservoir fluid identification.
【CateGory Index】: P631.4
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