Curtin/CSIRO Geophysics Seminar, 21st July 2022
Distributed acoustic sensing (DAS) for seismic-frequency laboratory measurements of elastic properties: recent progress
Date: Thursday, 21st of July, 2022
Time: 11:00 AM – 12:00 PM
Location: CSIRO Seminar room (WA-Kensington-B2-F3-R00-Seminar); Microsoft Teams
Abstract: Forced-oscillation stress-strain laboratory measurements are increasingly employed to obtain elastic and viscoelastic properties of rocks at seismic frequencies. Yet these measurements are slow time-consuming and expensive, due in part to the use of metal or semiconductor strain gauges, which need to be glued to the sample. Such gauges are fragile, have relatively low sensitivity, and measure very local strain only so that the measurements can be affected by a slight misalignment of the system assembly and local heterogeneity of the rock. The emergence of fibre-optic distributed acoustic sensing (DAS) technology provides an alternative means of measuring strain. Ultra-low strain measurements with DAS involve winding an optical fibre around the sample multiple times and connecting it to a DAS recording unit.
In this presentation we will report progress results on the development of a rock physics apparatus able to characterise elastic properties of the rocks at seismic frequencies using DAS.
The feedback of the audience is crucial to progress further.
References: Yurikov et all., (2021) The Leading Edge 40, 655-661.
Biography: Professor Maxim Lebedev is accountable for Rock Physics Experiments at Curtin University.