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What is Q estimation .How and why do we measure it.Then what is Q inversion?

Dear Jeevan,

When a seismic wave passes through Earth, some energy is lost by attenuation. This attenuation is generally quantified by Q. Note that there are two processes: intrinsic and extrinsic/scattering attenuation. The first one is considered t be a rock property and occurs because the seismic energy is converted into heat (mainly). The scattering can also cause attenuation due to local variations in rock properties.

Thus, if you the attenuation then to a certain degree, you will be aware of the reservoir properties. Therefore, if you estimate attenuation (Q), then you can improve the seismic image/quality.

You can either use the theoretical concepts by building a geologic model or VSP data to estimate the Q-factor over a depth scale. Then apply it on the seismic data.

For the later question, I refer you to read this book:

Seismic Inverse Q Filtering
By Yanghua Wang

I hope this helps!



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Farrukh Qayyum


I would like to answer Geophysical questions with keen interest, specifically exploration related. I want to hear from users for their queries on exploration geophysics/geology. Especially in the discipline of Reservoir Characterization from seismic reflection data. The questions related to basics and interpretational applications would be most welcome. I can also answer queries related to sequence and/or seismic stratigraphy, geology, general geomorphology, seismic geomorphology and other relevant questions. I can not answer the questions related to gravity, magnetic, or resistivity surveying or question related to the fluid dynamics. Such categories are not related to my experience.


Over eight years in different services with additional case studies of Pakistan, China, Saudi Arabia, North Sea, Africa and Netherlands offshore.

dGB Earth Sciences, The Netherlands.


4D Wheeler Diagrams: Concept and Applications, Qayyum, F., P. de Groot, N. Hemstra, and O. Catuneanu, 2014, Geological Society, London, Special Publications, v. 404, p. SP404.1, doi:10.1144/SP404.1.

A Modern Approach to Build 3D Sequence Stratigraphic Framework Qayyum, F., Hemstra, N., and Singh, R., 2013, Oil and Gas Journal, vol.111, issue 10.

Dense sets of seismic horizons - A New Approach to Stratigraphic Interpretation Qayyum, F., Hemstra, N., and de Groot, P., 2013, Geophysical Corner, AAPG Explorer, September Issue, 68-69.

Developments and Future Trends in Wheeler Diagrams Qayyum, F., Catuneanu, O., de Groot, P., 2013, 75th EAGE Conference & Exhibition incorporating SPE EUROPEC, London, UK, June 2013.

HorizonCube and Wheeler Transform Generated, Stratal Packages Identified and Correlated on 7 Regional 2D Seismic Lines McDonough, K.J., Qayyum, F., Bouanga, E., and Pierard, C., Horn, B., Gross, J., Danforth, A., Sterne, E.J., Granath, J., AAPG Annual Convention & Exhibition, May 2013

On the horizon, de Groot, P., Qayyum, F., Oilfield Technology, January 2013.

Attributes play important role in seismic interpretation, de Groot, P., Qayyum, F., Hart's E&P Magazine, p. 31-34, October 2012.

From 2D to 4D Wheeler Diagrams, F. Qayyum, P. de Groot, and N. Hemstra, William Smith Meeting 2012, London.

Building a Sequence Stratigraphic Framework from HorizonCube and Well Data F. Qayyum, P. de Groot, J. Yasin 74th EAGE Conference & Exhibition, 2012

An old favourite, F. Qayyum and P. de Groot, Oilfield Technology, March 2012.

Using 3D Wheeler diagrams in seismic interpretation the HorizonCube method F. Qayyum, P. de Groot,N. Hemstra First Break 30 (3), 103-109,2012

Master in Philosophy with specialization in reservoir characterization by using Sequence Stratigraphy. And master in Geophysics with a case study of Punjab Platform.

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