Curvature Computations Enhance Exploration   
By Satinder Chopra, Kurt Marfurt / November 2011

This month's Geophysical Corner deals with a comparison of structural and amplitude curvatures.

Blended Data Renders Visual Value   
By Bob Hardage / October 2011

To co-render seismic attributes means to blend two or more seismic attributes into a single, unified data display.

Deep Thinking: 4C Proves Value on Seafloor   
By Bob Hardage / September 2011

Marine 4C seismic technology was developed to assist hydrocarbon exploration and development – but 4C data have important marine engineering applications that have not been exploited.

For Fractures, P + S = Maximum Efficiency   
By Bob Hardage / August 2011

In areas where fracture-producing stress fields have been oriented at different azimuths over geologic time, there can be fracture sets of varying intensities and different orientations across a stratigraphic interval.

Measuring Fractures – Quality and Quantity   
By Bob Hardage / July 2011

As has been emphasized in the three preceding articles of this series, when a shear (S) wave propagates through a rock unit that has aligned vertical fractures, it splits into two S waves – a fast-S (S1) mode and a slow-S (S2) mode.

S-Waves on Crack? Not So Much   
By Bob Hardage / June 2011

This month we continue our series on S waves and factures by taking a look at another laboratory measurement that illustrates an important behavior of S waves that propagate in fractured media.

Turn, Turn, Turn: Rotating for S-Wave Data   
/ May 2011

This month we expand our insights into the behavior of seismic S waves as they propagate through a fractured interval, with the emphasis placed on laboratory data of real S waves propagating through fractured real-Earth media.

S Waves Prove Their Worth With Fractures   
By Bob Hardage / April 2011

When a shear (S) wave propagates through a rock unit that has vertical fractures oriented at a reasonably consistent azimuth, it splits into two S waves that propagate with distinct velocities.

Getting More From Frequency-Enhanced Data   
By Bob Hardage / March 2011

Seismic attributes are particularly effective for extracting subtle geologic features from relatively noise-free seismic data. However, seismic data are usually contaminated by both random and coherent noise, even when the data have been migrated reasonably well and are multiple-free.

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.

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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.


Geophysical Corner

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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