9/1/2023 0 Comments Geophysical zond crack![]() ![]() The model describes the nonlinear variation of Vp/Vs ratio with porosity. The results showed that this simplified model could be used to fit the sonic data to within 2% over large reservoir intervals that include different carbonate rocks with porosity varying from below 10% to above 30%. We examined the validity of the model by simultaneously fitting Vp and Vs data by adjusting the volumetric fraction of the three pore types. It uses three pore types to abstractly represent the acoustic and pressure response of carbonate reservoir rocks: "crack-like" pores with a low aspect ratio, reference pores that serve as the background trend, and "stiff" pores with a high aspect ratio. The model assumes idealized ellipsoidal pores of different aspect ratios (short axis/long axis of the ellipsoidal cavity). Acoustic velocities from core samples and sonic logs from an offshore carbonate oil field were analyzed to examine the validity of an analytical carbonate rock physics model (Xu et al., 2007) that was developed by modifying the original Xu-White (1995) model.
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