Curtin/CSIRO Geophysics Group Seminar, 11th August 2022

Time-lapse impedance monitoring using borehole seismic amplitudes of earthquake waves

Date: Thursday, 11th of August, 2022
Time: 11:00 AM – 12:00 PM
Location: ARRC Auditorium, 26 Dick Perry Avenue, Kensington; Microsoft Teams

Speakers: Professor Andrej Bona and Pavel Shashkin; Exploration Geophysics, Curtin University

Abstract:

As shown by several recent studies, the amplitude of the direct wave recorded by distributed acoustic sensors can be used as a proxy for the elastic properties. This concept was recently employed by the Curtin geophysics team to monitor temporal changes of elastic properties along the wellbore using waves from both controlled sources and earthquakes. In this talk, we analyse the theoretical background of the method and discuss its variations. We then demonstrate its practical application by using waves from regional earthquakes to monitor a CO2 injection within the Otway Stage 3 Project.

Biographies:

Andrej Bona received his MSc in theoretical physics from Czech Technical University in Prague in 1997, and PhD in applied mathematics from University of Calgary in 2002. From 2002 to 2003 he was a post-doctoral fellow at Memorial University in Canada, where he subsequently worked as assistant professor till 2007. He is currently a professor at the Centre for Exploration Geophysics, Curtin University (Perth, Australia). His research interests are in seismic wave propagation, including anisotropy and imaging, with applications mostly to mineral exploration.

Pavel Shashkin received MSc in geophysics from Moscow State University in 1996. He has over 25 years’ experience in seismic data processing, workflow building and optimization, geological and geophysical data management and high-performance computing hardware and software management. Currently he is a Research Fellow at Centre for Exploration Geophysics, Curtin University, specialising in processing of diverse types of seismic data including borehole distributed acoustic sensing and passive seismic records.