ESTIMATION OF SHEAR WAVE IMPEDANCE FROM P WAVE AMPLITUDE AND ITS APPLICATION IN DETERMINATION OF FLUID TYPE IN CARBONATE RESERVOIRS

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GOLALZADEH A.R.; JAVAHERIAN A.A.R.; NABI BID HENDI M.

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Journal: IRANIAN JOURNAL OF GEOPHYSICS Year:2008 | Volume:2 | Issue:1 Page(s): 25-37

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Title

ESTIMATION OF SHEAR WAVE IMPEDANCE FROM P WAVE AMPLITUDE AND ITS APPLICATION IN DETERMINATION OF FLUID TYPE IN CARBONATE RESERVOIRS

Author(s)

GOLALZADEH A.R. | JAVAHERIAN A.A.R. | NABI BID HENDI M. | Issue Writer Certificate

Keywords

DIRECTIVITYQ3

DARBEASTANE EARTHQUAKEQ3

FINITE-ELEMENT METHODQ3

ATTENUATION RELATIONSQ3

Abstract

According to different properties of P and S-waves and their different effects from elastic properties of rocks, valuable information including rock matrix and saturating fluid can be extracted when both P- and S-wave velocity data are available. Recording both P- and S-waves together is expensive and difficult. In this paper, it is shown that using seismic compressional wave, shear wave information can be estimated. Then, both of these data can be used to extract seismic attributes in order to detect variations of lithology and fluid information. In this paper, by applying inverse method both P- and S-wave reflection coefficients are estimated. Also, P- and S-wave impedances are estimated by applying the band limited seismic inversion method. Finally, we considered the application of this method on a carbonate reservoir in S.W. Iran. This study showed that the compressional and shear impedances are sensitive to reservoir properties and are able to distinguish fluid changing in carbonate reservoirs.modification factor is defined to take in to account the effect of rupture DIRECTIVITY in empirical velocity ATTENUATION RELATIONS. The modifications are based on modeling March-31st-2006 Darbeastane- Silakhor earthquake, using finite element method, applying ANSYS software. The ground motion parameters that are modified, include ratio of strike -normal (Vn) to strike parallel (Vp) component of horizontal velocity and strike- normal component to average horizontal velocity (V). The ratio of strike- normal to strike- parallel velocity is large in both the forward DIRECTIVITY direction, where velocity is larger, and in the backward DIRECTIVITY direction, where velocity is smaller. We therefore e expect the strike- normal to strike parallel ratio to be mainly controlled by DIRECTIVITY angle. Also the variation of fault normal velocity to average horizontal velocity ratio by DIRECTIVITY angle (b) is defined from earthquake modeling. It shows Vn to V ratio is controlled by DIRECTIVITY angle, distance between the site and epicenter and rupture' length. This ratio has the same trend in 2006 Darbeastane- Silakhor earthquake strong ground velocity data. In this research the equation for Vn to Vp variations by DIRECTIVITY angle is p recommended. We used Somerville et al. (1997) DIRECTIVITY model parameters as (R/ L) cos2 b to define DIRECTIVITY effect on Vn to V ratio. Therefore, DIRECTIVITY factor is the determined to account in empirical strong ground velocity ATTENUATION RELATIONS.

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APA: Copy

GOLALZADEH, A.R., JAVAHERIAN, A.A.R., & NABI BID HENDI, M.. (2008). ESTIMATION OF SHEAR WAVE IMPEDANCE FROM P WAVE AMPLITUDE AND ITS APPLICATION IN DETERMINATION OF FLUID TYPE IN CARBONATE RESERVOIRS. IRANIAN JOURNAL OF GEOPHYSICS, 2(1), 25-37. SID. https://sid.ir/paper/133890/en

Vancouver: Copy

GOLALZADEH A.R., JAVAHERIAN A.A.R., NABI BID HENDI M.. ESTIMATION OF SHEAR WAVE IMPEDANCE FROM P WAVE AMPLITUDE AND ITS APPLICATION IN DETERMINATION OF FLUID TYPE IN CARBONATE RESERVOIRS. IRANIAN JOURNAL OF GEOPHYSICS[Internet]. 2008;2(1):25-37. Available from: https://sid.ir/paper/133890/en

IEEE: Copy

A.R. GOLALZADEH, A.A.R. JAVAHERIAN, and M. NABI BID HENDI, “ESTIMATION OF SHEAR WAVE IMPEDANCE FROM P WAVE AMPLITUDE AND ITS APPLICATION IN DETERMINATION OF FLUID TYPE IN CARBONATE RESERVOIRS,” IRANIAN JOURNAL OF GEOPHYSICS, vol. 2, no. 1, pp. 25–37, 2008, [Online]. Available: https://sid.ir/paper/133890/en

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