Seismic attenuation, dispersion and anisotropy in porous rocks: mechanisms and models

2019 Honorary Lecturer
Pacific South

Boris Gurevich

Curtin University and CSIRO
Perth, Australia

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Summary

Understanding and modeling of attenuation of elastic waves in fluid-saturated rocks is important for a range of geophysical technologies that utilize seismic, acoustic, or ultrasonic amplitudes. A major cause of elastic wave attenuation is viscous dissipation due to the flow of the pore fluid induced by the passing wave. Wave-induced fluid flow occurs as a passing wave creates local pressure gradients within the fluid phase and the resulting fluid flow is accompanied with internal friction until the pore pressure is equilibrated. The fluid flow can take place on various length scales: for example, from compliant fractures into the equant pores (so-called squirt flow), or between mesoscopic heterogeneities like fluid patches in partially saturated rocks. A common feature of these mechanisms is heterogeneity of the pore space, such as fractures, compliant grain contacts, or fluid patches. Using theoretical calculations and experimental data, we will explore how this heterogeneity affects attenuation, dispersion, and anisotropy of porous rocks. I will outline a consistent theoretical approach that quantifies these phenomena and discuss rigorous bounds for attenuation and dispersion.

Biography

Gurevich

Boris Gurevich has an MSc in geophysics from Moscow State University (1976) and a PhD from Institute of Geosystems, Moscow, Russia (1988), where he began his research career (1981–¬¬1994). In 1995–2000 he was a research scientist at the Geophysical Institute of Israel, where he focused mainly on diffraction imaging problems. Since 2001, he has been a professor of geophysics at Curtin University and advisor to CSIRO (Perth, Western Australia). At Curtin he has served as Head of Department of Exploration Geophysics (2010–2015) and since 2004 as Director of the Curtin Reservoir Geophysics Consortium. He has served on editorial boards of Geophysics, Journal of Seismic Exploration, and Wave Motion. He is a Fellow of the Institute of Physics and has more than 100 journal publications in the areas of rock physics, poroelasticity, seismic theory, modeling, imaging, and monitoring of CO2 geosequestration. His research achievements include development of advanced theoretical models of seismic attenuation and dispersion in heterogeneous porous rocks.

Schedule

Date Location Host
13 Mar Perth, Australia ASEG-WA
15 Mar Canberra, Australia ASEG-ACT
19 Mar Brisbane, Australia ASEG-QLD
20 Mar Sydney, Australia ASEG-NSW
22 Mar Melbourne, Australia ASEG-VIC
25 Mar Adelaide, Australia ASEG-SA/NT
27 Mar Tasmania, Australia ASEG-TAS
17 Apr Singapore National University of Singapore
19 Apr Taoyuan, Taiwan National Central University
22–26 Apr Hong Kong, China TBD
29 Apr Schenzhen, China Southern University of Science & Technology
2 May Shenzhen, China CNOOC Research Institute
6 May Nanjing, China Hohai University
6 May Nanjing, China SEG South China Section
6 May Nanjing, China Nanjing University
8 May Wuhan, China Yangtze University
10 May Xi'an, China Northwest University
10 May Xi'an, China Chang'an University
13 May Chengdu, China Southwest Petroleum University
14 May Chengdu, China Chengdu University of Technology
15 May Beijing, China Chinese Academy of Sciences
16 May Changping, China China University of Petroelum Beijing
17 May Beijing, China Institute of Acoustics CAS
17 May Beijing, China China University of Mining and Technology
20 May Dongying, China Sinopec Geophysical Research Institte of the Shengli Oil Field
21 May Qingdao, China Ocean University of China, Marine Geosciences
21 May Qingdao, China China University of Petroleum - East
23 May Tokyo, Japan SEG Japan
24 May Kyoto City, Japan Kyoto University

SEG Honorary Lecturers
Sponsored by:

Shell

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