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Study On Qp-Wave Elastic Impedance Characteristic in Fractured Equivalent TTI MediaNormal access

Authors: S. Zhang, H. Huang and Y.N. Luo
Event name: 79th EAGE Conference and Exhibition 2017
Session: Seismic Anisotropy in Fractured Reservoirs - The Anisotropic Signatures
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201701407
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.65Mb )
Price: € 20

Summary:
We deduced a kind of elastic impedance equation for fracture equivalent TTI media with the idea from elastic impedance obtained by Connolly,basing on the reflection coefficient formula of TTI media and Hudson’ theory. The equation intuitively built the relationship between elastic impedance and fracture parameters including fracture density, filling and dip. On the basis of this equation, this paper analyzes PP-wave elastic sensitivities with filling and fracture density and summarizes the change of PP-Wave elastic impedance with facture dip. Result show that the difference between PP-wave elastic impedance of dry fracture and unfractured reservoir is strong including gradient and intercept of elastic impedance,and it is inversely proportional to the fracture dip. However ,there is a little change in the elastic impedance of the water-filled fracture. Meanwhile fracture density is also affected by fracture dip. The bigger fracture density, the more PP-wave elastic impedance of fracture media versus with the fracture dip will alter.


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