Observations of time-lapse converted-wave anomalies on Valhall LoFS data
Journal
Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas
Journal Volume
1
Pages
31-35
Date Issued
2006
Author(s)
Abstract
We analyse a subset of the converted-wave data from the Valhall LoFS surveys 1 and 3 in order to investigate whether any time-lapse signal can be seen on the converted waves. Measurements of shear-wave splitting indicate a change in the magnitude of azimuthal anisotropy in the overburden between the surveys. After PSTM we observe a significant time-lapse anomaly at the reservoir level at the location of a production well. The anomaly is only found for azimuth sectors around the average polarization direction of the slow shear wave in the reservoir interval. Copyright 2006, European Association of Geoscientists and Engineers.
Subjects
Anisotropy
Data reduction
Electromagnetic wave polarization
Measurement theory
Oil wells
Petroleum reservoirs
Production wells
Shear-wave splitting
Elastic waves
Type
conference paper