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Geophysical Corner

Determining Brittleness From Seismic Data  
By Satinder Chopra, Ritesh Sharma / October 2015
The key elements for shale resource evaluation are the mineral content – such as clay, quartz and calcite – the total organic carbon (TOC) content, the brittleness and some mechanical properties of the shale rocks. Geomechanical studies are necessary both for understanding wellbore environment stability and also interpreting well log data, by estimating the mechanical properties of the subsurface.
Finding a Better Path to Impedance Inversion  
By Amit Ray, Ritesh Sharma, Satinder Chopra / September 2015
The proposed workflow for generating a low-frequency impedance model is superior to the existing methods of low-frequency impedance generation. The quality of the low-frequency impedance model used in the inversion has a pronounced effect on the final impedance result, and thus a superior low-frequency impedance model when used in the inversion process yields a more accurate impedance inversion output.
Uncertainty? 'Staged' Inversion to the Rescue  
By Arnaud Huck, Ayrat Sirazhiev, Richard Huis in't Veld, Andries K.T Wever, Claire Pierard / August 2015
This month’s column starts with a staged stochastic inversion scheme that was applied in a southern North Sea Carboniferous setting.
Impedance Inversion: Big Aid In Interpretation  
By Satinder Chopra, Ritesh Sharma, Mohammad Hossein Nemati, Mike Perz, Peter Cary / July 2015
Having first examined the post-stack and prestack methods of seismic impedance inversion (May and June 2015 EXPLORER), we now end the three-part series by turning our attention to joint inversion of multicomponent data.
Impedance Inversion’s Value in Interpretation  
By Satinder Chopra, Ritesh Sharma / June 2015
In last month’s Geophysical Corner `we described the different poststack impedance inversion methods that are available in our seismic industry. In poststack seismic inversion – where there is no mode conversion at normal incidence – it is purely acoustic. P-wave impedance is the only information that can be estimated from poststack inversion of P-wave data.
The Transformers: A Big Aid in Interpretation  
By Satinder Chopra, Ritesh Sharma / May 2015
Seismic inversion for acoustic impedance is widely used in our industry today, mainly due to the ease and accuracy of interpretation of impedance data, but also because it allows an integrated approach to geological interpretation. This month’s column refers to “inversion” as the transformation of seismic amplitude data into acoustic impedance data.
Attribute Analysis of Mid-Continent Washes  
By Ryan Fairfield, Renjun Wen / April 2015
The Anadarko Basin granite wash play has been considered difficult to interpret both geologically and geophysically. Consequently, the application of seismic attribute analysis to mid-continent washes has not been widely published.
A Delicate Balance: Seeing Faults More Clearly  
By Satinder Chopra, Kurt Marfurt / March 2015

Spectral decomposition of seismic data helps in the analysis of subtle stratigraphic plays and fractured reservoirs. The different methods used for decomposing the seismic data into individual frequency components within the seismic data bandwidth serve to transform the seismic data from the time domain to the frequency domain– and generate the spectral magnitude and phase components at every time-frequency sample.

Fault Finding? Access to 3-D Data Always Helps  
By Esther Ali, Emma Giddens, Juan Martinez- Munoz, Karl Schleicher, Dennis Cooke, Kurt Marfurt / February 2015

Access to modern 3-D seismic data is critical to educating the next generation of sedimentologists, stratigraphers, structural geologists and geophysicists who envision a career in the petroleum industry.

Sobel Filtering Brings Edges Into Sharp Focus  
By Satinder Chopra, Kurt Marfurt / January 2015

This month’s Geophysical Corner column deals with Sobel filtering for enhancing seismic coherence attribute.

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Geophysical Corner

Geophysical Corner - Satinder Chopra
Satinder Chopra, award-winning chief geophysicist (reservoir), at Arcis Seismic Solutions, Calgary, Canada, and a past AAPG-SEG Joint Distinguished Lecturer began serving as the editor of the Geophysical Corner column in 2012.

Geophysical Corner

The Geophysical Corner is a regular column in the EXPLORER that features geophysical case studies, techniques and application to the petroleum industry.


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