Analysis of well-log data from the White Rose oilfield, offshore Newfoundland

Jessica Jaramillo Sarasty and Robert R. Stewart

ABSTRACT

We used dipole sonic, density, gamma-ray, and porosity logs (density porosity and neutron porosity) in the continuing petrophysical analysis of the White Rose area, offshore Newfoundland. To this end, we have plotted seismic parameters versus various porosity measurements as determined from well logs. In general, velocity increases as total porosity decreases. Vp/Vs decreases slightly when total porosity decreases. Vs shows a high correlation with porosity. Seismic parameters show promise to predict porosity values.

In addition, we find that Castagna's "mudrock" relationship predicts Vs from Vp reasonably well in the clastic section. Better fits can be achieved by dividing the lithologies into regions.

In general, the Faust relation predicts Vs reasonably well. For a better fit with the well data it requires a constant different from 125.3, the results were encouraging.

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