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Geophysical Corner

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.

5-D Interpolation Compensates for Poor Sampling  
By Daniel Trad / December 2014

Three-D seismic surveys always suffer from poor sampling along at least one spatial dimension – that’s why many techniques have been developed over the years to interpolate data, in particular before final migration.

Autotracking Your Way to Success  
By Satinder Chopra, Kurt Marfurt / November 2014

Depending on the seismic data quality and either the presence or lack of isolated strong reflectors, identifying horizons can be a trivial exercise or a challenging problem.

Causes and Appearance of Noise in Seismic Data Volumes  
By Satinder Chopra, Kurt Marfurt / October 2014

Seismic data are usually contaminated with noise, which refers to any unwanted features in the data. These unwanted features may actually be somebody else’s signal, such as converted waves in what we think of as “P-wave” data – but more commonly, these unwanted “noise” features provide little or no information about the subsurface, and are referred to as random noise and coherent noise.

Integrated Data Enhance Dolomite Mapping  
By Ritesh Sharma, Satinder Chopra, Amit Ray / September 2014
The purpose of this article is to describe a workflow for discriminating limestones and dolomites, and to map the lateral extent of dolomite reservoir rocks that have a thickness below the seismic resolution.
Spectral Decomposition for 3-D Geomodeling  
By Brad Wallet / August 2014
In recent years, a number of workflows have been developed to use spectral decomposition for 3-D geomodeling to extract architectural elements such as channels.
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Geophysical Corner

Geophysical Corner - Satinder Chopra
Satinder Chopra, chief geophysicist (reservoir), at Arcis Seismic Solutions, Calgary, Canada, 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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