Benefits of Hydrophones for Land Seismic Monitoring

CGGVeritas has conducted for Shell Canada a 4D project based on a network of buried mini-vibrators associated with buried sensors. This paper shows a comparison of signal and noise recorded on different types of sensors (surface DSU, buried geophones and hydrophones). We conclude that buried hydrophones provided the best data quality: (i) they are free of shear wave, (ii) they present a better Signal to Noise ratio (20dB gain), (iii) they show better repeatability. Therefore, hydrophones are well adapted for permanent seismic land acquisition used in 4D monitoring.