Well log analysis of elastic properties from the White Rose oilfield, offshore Newfoundland

Jessica Maria Jaramillo Sarasty, Robert R. Stewart

This work conducts the analysis of six well logs (A-90, E-09, H-20, J-49, L-08, and N- 22) from the White Rose field, offshore Newfoundland. We used dipole sonic, density, gamma-ray, and resistivity logs, for this analysis and plotted Vp and Vs versus depth, Vp and Vs versus gamma-ray, Vp/Vs ratio versus depth, Vp/Vs ratio versus gamma-ray, Vp real versus Vp predicted by Faust relation, Vs real versus Vs predicted by Faust relation, Vs real versus Vs predicted by Castagna relation, and finally density real versus density predicted by Gardner relation. In general, Vp and Vs increase with depth, with the exception of well A-90. Similarly, we observe a decrease with depth of the Vp/Vs value in all the wells with the exception of A-90, where we observe an increase of Vp/Vs ratio with depth. In general, the Faust relation provides a good prediction for Vp, with the Faust's constant of 125.3. Gardner's relation, had difficulty predicting the density value in wells J-49, L-08, and N-22; however, it worked relatively well in wells E-09 and H-20. We applied the Faust equation to predict the Vs from geological time and the depth of burial of rock, the results were encouraging. The Castagna relation predicted Vs from Vp quite well. Better fits can be achieve by dividing the lithologies into regions (those above and below the Wyandot Formation).