Bulletin Article

3250
 

Criteria for recognizing stratigraphic sequences are well established on continental margins but more challenging to apply in basinal settings. We report an investigation of the Upper Devonian Woodford Shale, Permian Basin, west Texas based on a set of four long cores, identifying sea level cycles and stratigraphic sequences in an organic-rich shale.

The Woodford Shale is dominated by organic-rich mudstone, sharply overlain by a bioturbated organic-poor mudstone that is consistent with a second-order eustatic sea level fall. Interbedded with the organic-rich mudstone are carbonate beds, chert beds, and radiolarian laminae, all interpreted as sediment gravity-flow deposits. Bundles of interbedded mudstone and carbonate beds alternate with intervals of organic-rich mudstone and thin radiolaria-rich laminae, defining a 5–10 m (16–33 ft)-thick third-order cyclicity. The former are interpreted to represent highstand systems tracts, whereas the latter are interpreted as representing falling stage, lowstand, and transgressive systems tracts. Carbonate beds predominate in the lower Woodford section, associated with highstand shedding at a second-order scale; chert beds predominate in the upper Woodford section, responding to the second-order lowstand.

Additional variability is introduced by geographic position. Wells nearest the western margin of the basin have the greatest concentration of carbonate beds caused by proximity to a carbonate platform. A well near the southern margin has the greatest concentration of chert beds, resulting from shedding of biogenic silica from a southern source. A well in the basin center has little chert and carbonate; here, third-order sea level cycles were primarily reflected in the stratigraphic distribution of radiolarian-rich laminae.

Explorer Article

2522
 
Explorer Article

EIA's Petroleum Supply Monthly report shows oil production in the lower 48 states has increased over the last three years.

Explorer Division Column DPA

10745
 
During my term as DPA president this year our theme will be “Culture of Greatness.” This may sound arrogant, but I think it is important to recognize and promote the culture of professionalism and discovery that has provided cheap energy for mankind for more than 100 years.

Explorer Emphasis

9507
 
Explorer Emphasis Article

America’s recent ascent to the high-level status of a hydrocarbon producer worthy of a significant presence on the world stage of leading producers stems from something new and a rebirth of something old.

127
 
Explorer Emphasis Article

Is that a UFO? Actually it is a UAV (unmanned aerial vehicle), which is an airborne drone that is proving to be useful both onshore and offshore.

2653
 
Explorer Emphasis Article

A valuable study funded by the Texas Water Development Board sets aside the controversy and takes a closer look at hydraulic fracturing and water resources and consumption.

2628
 
Explorer Emphasis Article

Wireless 'push-pull' shooting method reduces acquisition costs relative to traces per bin in recent Permian Basin survey.

2525
 
Explorer Emphasis Article

New dimensions: Geoscientists study how 3-D views of Eagle Ford outcrops are a great tool.

2347
 
Explorer Emphasis Article

Bottoms up! The successful Barnett play is getting a second look, thanks to a new study that took a bottomsup approach to determines areas with the best potential.

2324
 
Explorer Emphasis Article

A regional database of more than 3,500 producing Eagle Ford wells is helping to highlight production trends and optimal engineering parameters.

Education Conference Course

Houston Texas United States 10 November, 2014 11 November, 2014 10569
 
Houston, Texas, United States
10-11 November 2014

This course is oriented towards the recognition and characterization of uncertainty in unconventional reservoirs.

Houston Texas United States 10 November, 2014 11 November, 2014 10487
 
Houston, Texas, United States
10-11 November 2014

This course summarizes the major advances and current controversies in dolomite research.

Online e Symposium

02 October, 2014 02 October, 2014 10593
 
2 October 2014
This course is ideal for individuals involved in Midland Basin exploration and development. Successful development of Wolfcamp shale oil relies on complex inter-relationships (ultimately interdependencies) within and between a wide variety of scientific disciplines, financial entities, and company partnerships. 

Short Course

Abilene Texas United States 05 January, 2015 05 January, 2015 10649
 
Abilene, Texas, United States
5 January 2015
The AAPG Southwest Section presents the 2015 Bill Hailey Memorial Short Course in Abilene, Texas. Art Saller will be speaking on Paleozoic carbonates. 
Fort Worth Texas United States 06 January, 2015 06 January, 2015 10658
 
Fort Worth, Texas, United States
6 January 2015
The AAPG Southwest Section presents the 2015 Bill Hailey Memorial Short Course in Fort Worth, Texas. Art Saller will be speaking on Paleozoic carbonates. 
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