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A WELL-LOG REGRESSION ANALYSIS FOR P-WAVE VELOCITY PREDICTION IN THE NAMORADO OIL FIELD, CAMPOS BASIN

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Figure 1 shows part of the structural map of the Namorado field.
Figure 2 – Geophysical logs at well-4: (a) induction resistivity (ILD, in blue) in Ohm.m; (b) neutron porosity (NPHI, in red) in percentage and gamma-ray GR (API units); (c) bulk density (RHOB, in red) in g/cm 3 and the P-wave velocity v p (km/s) profile c
Figure 3 – Geophysical logs at well-37; logs are displayed using the same color code as in Figure 2
Table 2 – Least-squares regression coefficients for P-wave velocity models at well-4, but assuming the following gene- gene-ral forms: v p = a 0 + a 1 x + a 2 y + a 3 z + a 4 x y + a 5 x z + a 6 y z + a 7 x 2 + a 8 y 2 + a 9 z 2 and v p = a 0 exp[ a 1 x +
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