Abstract: Reservoir monitoring by seismic imaging usually relies on comparing Earth models or sections acquired at time intervals of several years. In most cases, the quantities being compared are the reflection strength, P and S velocity, and more rarely attributes derived from AVO analysis. In this presentation, a new approach is presented based on time-lapse estimations of the Q factor. This method establishes a hybrid link between macro-models obtained by Q tomography and micro-models derived from the instantaneous frequency. The combination of these two ingredients allows broadening the spectrum of the estimated Q-factor images of the Earth.
The proposed method is not a full-waveform inversion algorithm by itself, but provides a good initial model for the Q-factor inversion. This contribution may be quite important, to reduce the cross-talk between different rock parameters in a subsequent actual full-waveform inversion. The practical value of such an estimate for the oil and gas industry is significant, as anomalies in the absorption of elastic waves are often related to saturating fluids and fractures: locating changes of these properties in a reservoir due to production is very relevant for petroleum engineers.
Bio: Aldo Vesnaver received an MS in physics and a PhD in geophysics from the University of Trieste (Italy). For over 20 years, he worked at OGS (Italian National Institute of Oceanography and Experimental Geophysics). From 2001 to 2006, he worked at Saudi Aramco in seismic R&D. From 2010 to 2013, he taught as Saudi Aramco Chair Professor at KFUPM University (Saudi Arabia). From 2014 to present, he has been teaching at the Petroleum Institute of Abu Dhabi as KADOC Chair Professor. He is a cofounder and a former President of the Italian EAGE-SEG Section in 2001.
He has been an Associate Editor of the journal Geophysical Prospecting from 2003 to present, and from 2006 to 2008 has been its Editor-in-Chief. In 2010 he was awarded SEG Life Membership. He published over 150 papers in international refereed journals or conference proceedings.