| Instructor: | Dr. Per Avseth |
|---|---|
| Duration: | 20 min + Q&A |
| Discipline: | Rock physics modelling of volcanics |
| Main topics: | Quantitative seismic interpretation of volcanic rocks |
| Language: | English |
Request this Webinar Overview of all scheduled webinars Read Paper in EarthDoc Watch E-Lecture
Attending webinars and access to recent EarthDoc material is free of charge for EAGE members, join here.Description
A study is conducted to investigate the rock physics properties of volcanic facies from available core measurements from Iceland and Hawaii. The main goal is to investigate the rock physics properties of a set of volcanic rock samples, and to establish predictive rock physics templates for these rocks, as a function of facies and rock texture, fluids and minerology. We focus on lava flows and hyaloclastites from Iceland and Hawaii. We find that both these facies can be modelled using modified Hashin-Shtrikman upper elastic bounds, and we create rock-physics templates for varying porosity and fluid saturations. Dry or gas-filled hyaloclastite facies plots with low acoustic impedances and low Vp/Vs ratios and are nicely separated from brine-filled hyaloclastites. Dry and wet high-porosity/high-permeability vesicular lavas will have similar AI and Vp/Vs values, and therefore these rocks will be more difficult to discriminate seismically.About the Lecturer
Per Avseth is a geophysical advisor and CTO of Dig Science in Oslo, Norway, and a part-time researcher at the Dept. of Electronic Systems at the Norwegian University of Science and Technology (NTNU) in Trondheim. Per received his M.Sc. in Applied Petroleum Geosciences from NTNU in 1993, and his Ph.D. in Geophysics from Stanford University, California, in 2000. Per worked as a research geophysicist at Norsk Hydro in Bergen, Norway (2001-2006), a consultant at Rock Physics Technology (2006-2008) and Odin Petroleum (2008-2012) in Bergen, and as a geophysical advisor at Tullow Oil in Oslo (2012-2016). He held a position as an adjunct professor in reservoir geophysics at the Dept. of Petroleum and Geoscience at NTNU from 2008- 2020. Per was the SEG Honorary Lecturer for Europe in 2009. He is a co- author of the book Quantitative Seismic Interpretation (Cambridge University Press, 2005), and has published extensively in the fields of rock physics and AVO analysis. His current research focuses on basin-scale rock physics and integration of basin modeling, sedimentology and rock physics.