Abstract
The complexity of carbonate reservoirs is, in part, caused by the multiple rock-types and porosity types that may occur in any carbonate reservoir. Consequently, a persistent concern has been how to derive accurate quantitative estimates of carbonate reservoir properties from borehole and seismic data. Recent developments in this pursuit involve combined use of S-wave and P-wave data, together with petrophysical definitions of their impedances in a manner that lends them geologic character and significance. S-wave impedance and P-wave impedance are linearly related with their respective velocities. Both relationships are rock-typing criteria since their slope and intercept terms consist of geology-dependent coefficients. Linear-linear crossplots of S-wave impedance versus S-wave velocity and P-wave impedance versus P-wave velocity, using core scale measurements in four wells, support the linearity, pattern of data points, and character of the lines predicted for brine and air/gas pore fluids. The slopes and intercepts obtained by the method of linear regression analysis also show values that are location-specific, as well as exhibit variabilities that are indicative of reservoir heterogeneities from one well to another. These results show strong potential in using impedance-velocity relationships for quantitative interpretations of well logs and reflection seismic data.
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