Bulletin Article

7962
 
We use three-dimensional seismic reflection data and new map-based structural restoration methods to define the displacement history and characteristics of a series of tear faults in the deep-water Niger Delta. Deformation in the deep-water Niger Delta is focused mostly within two fold-and-thrust belts that accommodate downdip shortening produced by updip extension on the continental shelf. This shortening is accommodated by a series of thrust sheets that are locally cut by strike-slip faults. Through seismic mapping and interpretation, we resolve these strike-slip faults to be tear faults that share a common detachment level with the thrust faults. Acting in conjunction, these structures have accommodated a north –south gradient in westward-directed shortening. We apply a map-based restoration technique implemented in Gocad to restore an upper stratigraphic horizon of the late Oligocene and use this analysis to calculate slip profiles along the strike-slip faults. The slip magnitudes and directions change abruptly along the lengths of the tear faults as they interact with numerous thrust sheets. The discontinuous nature of these slip profiles reflects the manner in which they have accommodated differential movement between the footwall and hanging-wall blocks of the thrust sheets. In cases for which the relationship between a strike-slip fault and multiple thrust faults is unclear, the recognition of this type of slip profile may distinguish thin-skinned tear faults from more conventional deep-seated, throughgoing strike-slip faults.
5770
 

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.

Explorer Article

8049
 

Online registration is open for this year’s AAPG Annual Convention and Exhibition, which will be held April 6-9 at the George R. Brown Convention Center in Houston – and reduced registration fees are still available for those who act fast.

8060
 
Explorer Article

Energized by the recent Statoil ASA-operated Bay du Nord light oil discovery in Newfoundland’s offshore Flemish Pass Basin, earth scientists are gearing up to host the fourth Atlantic Realm Conjugate Margins Conference in St. John’s, Newfoundland, Aug. 20-22.

Explorer Emphasis

8067
 
Explorer Emphasis Article

Imagine the insight to be gained from showing every aspect of an already drilled prospect, whether good or bad, to an audience of your peers for scrutiny. We’re talking peers from a company other than your own. There’s an industry forum that exists for this purpose.

8050
 

Seismic Outlook: After several years of plenty, 2014 is expected to be a comparatively lean year for the seismic industry, a few localized hot-spots around the world notwithstanding.

Explorer Geophysical Corner

10214
 
Explorer Geophysical Corner

Steeply dipping bedforms and bed sets often develop where sediment accumulates and migrates, and are expressed as clinoform patterns on seismic data. Ground-penetrating radar (GPR) provides ultra-high-resolution images of the internal structure of these sediment accumulations.

Explorer Making a Difference

10768
 
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.
9525
 
Explorer Making a Difference

Committed to going the extra mile to improve lives and communicate to an often skeptical public, Houston-based Noble Energy has experienced an outpouring of gratitude from the communities in which they operate.

Explorer Regions and Sections

10772
 
Preparation for the FIFA World Cup was not the only event attracting international audiences to Brazil in May. AAPG’s Geosciences Technology Workshop (GTW) Brasil, "Stratigraphic Traps and Play Concepts in Deep Water Settings," brought in 143 geoscientists representing 12 countries from the Americas, Europe and Asia.

Workshop

Dubai United Arab Emirates 17 May, 2015 19 May, 2015 10668
 
Dubai, United Arab Emirates
17-19 May 2015

Check the website for details as they develop.

Doha Qatar 16 February, 2015 18 February, 2015 10666
 
Doha, Qatar
16-18 February 2015

Check the website for details as they develop.

Dead Sea Jordan 08 June, 2015 10 June, 2015 10669
 
Dead Sea, Jordan
8-10 June 2015

Check the website for details as they develop.

Abu Dhabi United Arab Emirates 02 March, 2015 04 March, 2015 10667
 
Abu Dhabi, United Arab Emirates
2-4 March 2015

Check the website for details as they develop.

Abu Dhabi United Arab Emirates 26 January, 2015 28 January, 2015 10665
 
Abu Dhabi, United Arab Emirates
26-28 January 2015

Check the website as details develop.

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