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.

‘Unfolding’ Yields New Interpretations   
By Bob Hardage / April 2010

A pair of scissors always sat next to the box of colored pencils on Kees Rutten’s desk, littered with seismic sections, time-to-depth curves and well logs.

Shining Light on a Shady Situation   
By Bob Hardage / March 2010

Seismic reflection data come alive when displayed with shaded relief.

Good News: A Dim Future Isn’t Bad!   
By Bob Hardage / February 2010

Everyone has heard of a bright spot – a high seismic amplitude caused by hydrocarbon. Much oil and gas has been found by drilling anomalous bright reflections, particularly in younger sediments.

Vertical Wave Testing: Part 2   
By Bob Hardage / January 2010

Vertical wave testing is done by deploying seismic receivers downhole and recording the downgoing wavelet generated by each energy source being considered for surface seismic data acquisition across the area local to the receiver well.

Horizontal Wave Testing Helps   
By Bob Hardage / December 2009

This month’s column is the first of a two-part series dealing with seismic wave tests – horizontal wave testing.

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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.

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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Geophysical Corner - Bob Hardage
Bob A. Hardage, senior research scientist at the Bureau of Economic Geology, the University of Texas at Austin served as editor of the Geophysical Corner from 2006 to 2011.

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