RIGHT-TIME WELL AND LOOK-AHEAD POSITIONINGUSING SEISMIC TRAVELTIME DATA

摘要

Since the processing and data transfer capacity is highly limited in while drilling operations, it isrnimportant to evaluate the information content of different data sources. We focus on the analysisrnof seismic traveltime data acquired in the borehole, in particular the use of traveltime picks forrnwell geosteering. The Bayesian methodology that we propose is applicable to both forward VSPrn(receivers in well) and reverse VSP (Drill-bit noise). Traveltime picks are shown to be informativernof well position, distance to reflectors ahead of bit, and parameters of the velocity model.