seismic-while-drilling vertical seismic profile
A technique for acquiring a vertical seismicprofile that uses the noise of the drill bit as a source and receivers laid out along the ground or seabed; also called a drill-noise VSP. In deep water, the receiver arrays can be deployed vertically. Acquisition and processing are typically more challenging than in the more conventional types of VSPs, but the while-drilling
Detailed Explanation
technique can yield immediate time-depth information and, less frequently, reflection information. The information from a drill-noise VSP can be used to improve time-depth conversions while drilling, decide where to set casing in a well and evaluate drilling hazards, such as anomalousporepressure.