Full text loading...
-
A methodology to estimate maximum offset and reflection imaging radius for 2D/3D VSP survey
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Workshop on Borehole Geophysics, Jan 2011, cp-207-00005
- ISBN: 978-90-73781-95-5
Abstract
We have developed a straightforward and accurate ray-tracing based methodology to estimate both maximum offset and reflection imaging radius for multi-layered velocity models, which can be used for 2D/3D VSP survey design. Through numerical examples, we demonstrate that the presence of a high-velocity layer above a target zone will significantly reduce maximum offset and reflection imaging radius. In addition, our methodology more accurately predicts the VSP imaging radius than one estimated by the conventional straight-line based approximation. The conventional approximation often produces an incorrectly large reflection imaging radius.