Quantitative Prediction of Injected CO2 at Sleipner Using Wave-equation Based AVO
|Instructor||Dr. Peter Haffinger|
|Duration||45-60 minutes + 15 minutes Q&A|
|Main Topic(s):||Wave-equation based AVO, Quantitative prediction of reservoir fluids|
||AVO inversion, seismic reservoir characterisation|
|Date + Time
||23rd of October, 10:00 CEST|
This lecture is mainly concerned with the quantitative prediction of reservoir fluids in the subsurface and to this purpose the concept of wave-equation based AVO (WEB-AVO) inversion will be discussed. While conventional AVO technologies are usually based on the linearised Zoeppritz equations, WEB-AVO solves the full elastic wave-equation. Effectively, the technology becomes a true amplitude AVO scheme that properly takes complex wave-propagation effects as internal multiple scattering and mode conversion into account.
Another aspect that will be treated is the use of compressibility and shear compliance (inverses of bulk modulus and shear modulus) as parameters for reservoir characterisation. While acoustic impedance, shear impedance and/or vp/vs are mostly used in this context, WEB-AVO solves for compressibility and shear compliance since the wave-equation is formulated in these terms. What sounds like a necessity turns into added value since these parameters are highly sensitive to porosity and pore fill (compressibility) but also to lithology (shear compliance).
The presented technology will be demonstrated on a seismic field dataset from the Sleipner Carbon Capture and Storage (CCS) project. WEB-AVO was used to quantitatively estimate the amount of injected CO2 in 2008 and the results are in good accordance with the reported figures from the operating company.
- Geoscientists involved in seismic reservoir characterisation
- Geoscientists in the field of CO2 capture, storage and sequestration
- Geoscientists with an interest in alternative parameters for reservoir characterisation
- Professionals/students interested in new technologies
Before becoming a co-founder of Delft Inversion in 2013, Dr. Haffinger received a Ph.D. from Delft University of Technology (The Netherlands) for his work on full waveform inversion in general but also for specific applications to the reservoir. He was among the first year students of the International Joint Master programme in Applied Geophysics, organised by the IDEA League and including educational stays at TU Delft, ETH Zurich and RWTH Aachen. As part of his career he performed research for Western Geco in Gatwick, UK as well as the Saudi Aramco EXPEC Advanced Research Centre in Dhahran, Saudi Arabia. With the team of Delft Inversion his ambition is to establish the next generation AVO technology in the field of seismic reservoir characterisation.