In deeper sections, the SonicScope service provided continuous delta t
compressional and shear curves across all required target zones, which helped
obtain a continuous Vp/Vs curve over the entire interval where the tool was
Using the data while drilling and in future well planning
Real-time compressional data was used for pore pressure prediction,
seismic tie-in, and confirmation of formation tops. It was also used as the
primary source for estimating porosity in sections where nuclear tools could
not be used because of hole size or wellbore stability concerns. Real-time
velocities provided by the sonicVision service validated the prejob depth
migration of the surface seismic. Compressional data obtained in memory mode
validated the real-time data and was used to calculate rock strength to
optimize bit selection for the subsequent run.
During tripping in and out of the hole, TOC analysis was performed on
multiple liner strings. The advantage of LWD TOC logs was the ability to log at
multiple cement curing times when multiple passes were made over the liner
during each bit trip.
The sonic data obtained from this exploration well will be used in the
planning stages of future wells in this project.