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Geophysical Corner

Poisson Impedance Application to Shale Resource Characterization  
By Ritesh Sharma, Satinder Chopra / February 2016

The main goal for shale resource characterization is usually the identification of sweet spots, which represent the most favorable drilling targets. Such sweet spots can be identified as those pockets in the target formation that exhibit high total organic carbon (TOC) content, as well as high brittleness. As there is no direct way of computing TOC using seismic data, we adopt indirect ways for doing so.

Preconditioning of Seismic Data Prior to Impedance Inversion  
By Satinder Chopra, Ritesh Sharma / January 2016
The calibration of seismic data with the available well control is an important step that provides the link between seismic reflections, their stratigraphic interpretation and subsequent prediction of reservoir and fluid properties.
Using Volumetric Calculators For Better Accuracy  
By Kurt Marfurt, Lennon Infante Paez / December 2015

We present a simple workflow that allows an interpreter to more accurately extract such attributes using the volumetric calculators available in most commercial interpretation software packages.

Additional Data Helps Investment Decisions  
By Daniel Zweidler, Daniel Baltar, Neville Barker / November 2015

The often-volatile outcome of exploration investment decisions is tightly linked to the level of uncertainty in the geological interpretation and associated value assessment. In order to evaluate subsurface opportunities, information is needed.

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.
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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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