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Geophysical Corner

Riding the Waves: Getting S- When Getting P-   
By Bob Hardage / February 2011

For decades, seismic analysis of subsurface geology has been limited to information that can be extracted from compressional-wave (P-wave) seismic data – but numerous geophysicists are now becoming aware of the advantages of combining shear-wave (S-wave) data with P-wave data.

A Whole Lotta Shakin’ Going On   
By Bob Hardage / January 2011

Seismic contractors are continually searching for methods that will expedite seismic data acquisition – which is why several efforts have been made over the past three decades to develop procedures that will allow vibrators to shake simultaneously at different source stations, with the data being recorded by a common receiver grid.

Last Call: The Even-Integer Rule  
By Bob Hardage / December 2010

The final guideline that should be used when designing a 3-D survey is the use of the even-integer rule for specifying the exact dimensions of a recording swath.

Next Step: Is Stacking Fold Acceptable?  
By Bob Hardage / November 2010
Next Step: Geology Guides the 3-D Design  
By Bob Hardage / October 2010

This month we continue our look at 3-D seismic design.

First of a Series: 3-D Design Philosophy  
By Bob Hardage / September 2010

Part 1 of 4: The geometry of onshore 3-D seismic recording grids is based on five parameters: source-station spacing, receiver-station spacing, source-line spacing, receiver-line spacing and recording swath size. 

Compartments Can Challenge Logic  
By Bob Hardage / August 2010

In this article, we look at a reservoir compartment analysis done across a fluvial depositional system in South Texas.

Complex Traces: There’s an ‘App’ for That  
By Bob Hardage / July 2010

Last month we introduced the concept of a complex seismic trace; this month we’ll show how a complex trace provides a rigorous way to set the boundaries of data windows associated with distinct seismic reflections – and we’ll define the polarities of each of those reflection events.

‘Hilbert Transform’ Remains a Valuable Tool   
By Bob Hardage / June 2010

Geological interpretation of seismic data is commonly done by analyzing patterns of seismic amplitude, phase and frequency in map and section views across a prospect area.

 Looking High and Low for References   
By Bob Hardage / May 2010

The fundamental criteria required of a seismic reflection event that is to be used as a reference surface for interpreting thin-bed geology consists of three things.

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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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