Bulletin Article

 

We present a method of using fault displacement-distance profiles to distinguish fault-bend, shear fault-bend, and fault-propagation folds, and use these insights to guide balanced and retrodeformable interpretations of these structures. We first describe the displacement profiles associated with different end-member fault-related folding models, then provide examples of structures that are consistent with these model-based predictions. Natural examples are imaged in high-resolution two- and three dimensional seismic reflection data sets from the Niger Delta, Sichuan Basin, Sierras Pampeanas, and Cascadia to record variations in displacement with distance updip along faults (termed displacement-distance profiles). Fault-bend folds exhibit constant displacement along fault segments and changes in displacement associated with bends in faults, shear fault-bend folds demonstrate an increase in displacement through the shearing interval, and fault-propagation folds exhibit decreasing displacement toward the fault tip. More complex structures are then investigated using this method, demonstrating that displacement-distance profiles can be used to provide insight into structures that involve multiple fault-related folding processes or have changed kinematic behavior over time. These interpretations are supported by comparison with the kinematics inferred from the geometry of growth strata overlying these structures. Collectively, these analyses illustrate that the displacement-distance approach can provide valuable insights into the styles of fault-related folding.

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Explorer Article

 

Discoveries were comparatively sparse, but they persisted steadily throughout the year. Here are some of the more significant discoveries of the past year.

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A review of major oil and gas discoveries of 2013 shows a down year in terms of quantity—but that’s not the whole story.

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Where’s the beef? Latin America’s new Vaca Muerta play has loads of potential – and it’s not the only area that’s making South America a hot target for today’s explorationists.

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Explorer Emphasis

 

In international exploration, the new normal is starting to look like the old normal. And 2014 looked a lot like the year before.

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This year, URTeC has added an enhanced preview of “Coming Attractions.” In addition to looking at established plays, URTeC will provide significant information about emerging unconventional resource possibilities in North America and around the world.
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The Santos and Campos basins continue to be the world's hottest spot in deepwater and ultra-deepwater exploration.

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Explorer Foundation Update

 

It has a new name, a new energy and a new lineup of experts, all primed to spread geoscience knowledge around the world. “It” is AAPG’s newly named Global Distinguished Lecture Program – emphasis on the “global” – which dates back to 1941 but continues to be the Association’s flagship initiative for offering the latest in geologic science to AAPG affiliated geological societies and universities.

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Explorer Making a Difference

 
AAPG’s Publication Pipeline Committee recently had a small celebration to mark a very big accomplishment: Just a few weeks ago, the group officially topped the 100-ton mark of books, periodicals and other information that have been shipped around the world.
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Explorer Spotlight On…

 

According to Juan Carlos Soldo, who just recently led the successful IX Hydrocarbon Exploration and Development Congress in Mendoza, Argentina, “Unconventionals really aren't so unconventional anymore.” 

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