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PESA WA: May Evening Talk – Towards High-Frequency FWI as an Interpretation Solution

Tuesday, May 21 @ 17:30 - 19:30

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Guest Speaker: Laurence Letki

Laurence Letki graduated from Ecole Polytechnique in 2007 and holds a MSc in Naval Architecture from the University of Southampton (UK) and a MSc in Geomatic Engineering from University College London (UK). Her career began in the French Hydrographic office, specialising in hydrographic, oceanographic and geophysical surveys. Laurence then moved to WesternGeco in 2009 and held several positions including area geophysicist and product champion, responsible for the testing and commercialisation of new seismic processing and imaging technologies, before joining DownUnder GeoSolutions (DUG) in 2017. Laurence is DUG’s Principal Geophysicist.

Hosted with thanks to our evening talks sponsor:

PESA WA invites you to our May evening talk with guest speaker Laurence Letki, Principal Geophysicist at DownUnder GeoSolutions and her talk on:

“Towards High-Frequency FWI as an Interpretation Solution”

Presented by Laurence Letki


The amount of available data to help us characterise the subsurface is ever increasing. Large seismic surveys, long-offsets, multi-azimuth and full-azimuth datasets – including 3D and 4D, marine, OBN and extremely high fold land surveys – are now common. In parallel, compute power is also increasing, and, in combination with better data, this enables us to develop better tools and to utilise better physics to build models of the subsurface. Wave-equation based techniques, such as full waveform inversion (FWI), have therefore become a lot more practical. FWI utilises the entire wavefield – including refractions and reflections, primaries and multiples – to generate a refined, high-resolution Earth model.

This technique is now commonly used at lower frequencies (less than 12 Hz) to derive more accurate models for improved seismic imaging and reduced depth conversion uncertainty. By including higher frequencies in FWI, we can attempt to resolve for finer and finer details. FWI models utilising the entire bandwidth of the seismic data constitute an interpretation product in itself, with applications to both structural interpretation and reservoir characterisation. Incorporating more physics within the FWI implementation combined with modern supercomputer facilities promises to increase the focus on very high-frequency FWI in the coming years. In this paper, through a series of field examples, we illustrate the applications and rewards of high-frequency FWI: from improved imaging, improved quantitative interpretation and depth conversion towards a direct interpretation of the FWI models.

Event Details:

Date: Tuesday, 21st May 2019
Time: 5:30-7:30pm [Talk from 6:00- 6:40pm, Networking 6:40-7:30pm].
Venue: The George Hotel, 216 St. Georges Terrace, Perth, WA 6000

Ticket Prices:

Members: $15.00

Student Members: Free!

Non-Members: $30.00

Ticket sales close Tuesday 21st May, 12:00pm (AWST)


Tuesday, May 21
17:30 - 19:30


The George Hotel
216 St Georges Terrace, PERTH, Perth 6000
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PESA Western Australia
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