Middle East

A low frequency passive seismic experiment was con-ducted over an onshore carbonate oilfield in Abu Dhabi in an effort to confirm and understand the origins of a low frequency signal that has been observed above several hydrocarbon reservoirs in the area. While the analyses of the data are still on-going the prelimi-nary results of the experiment have confirmed the existence of a narrow band of low frequency (2.5-2.8 Hz) signals over the oil reservoir zone; however, this analysis has found that these signals are also detected over the water saturated zone. More studies will need to be conducted to fully investigate the particle motion of these waves, their apparent velocities, and the azimuth of their wave fronts. Background For the past several years a narrow band of low frequency (1.5 – 4 Hz) signals have been observed and reported over a number of hydrocarbon reservoirs mainly in the Middle Eas