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

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.

2522
 

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

Explorer Emphasis

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.

127
 

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
 

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
 

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

2525
 

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

2347
 

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
 

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

Short Course

Houston Texas United States 08 December, 2014 11 December, 2014 1517
 
Houston, Texas, United States
8-11 December 2014

This course is designed to give participants the basic working tools to explore and develop hydrocarbons in salt basins. Because no two basins are alike, the focus is on understanding the processes and styles of salt-related deformation. At course completion participants should be able to under the depositional setting of layered evaporites, describe the mechanics of salt flow, interpret salt and stratal geometries associated with diapirs, salt welds, and minibasins, and assess more accurately the risks in the exploration of salt basins.

Austin Texas United States 29 April, 2014 01 May, 2014 1518
 
Austin, Texas, United States
29 April - 1 May 2014

The overall goal of this course is to provide tools for efficient and effective re-exploration and development. It uses a two-part approach. First it uses petrophysical analysis to understand all that can be derived from examination of standard open-hole logs. This is followed by integrated approaches to discover key factors controlling oil and gas distribution in carbonate reservoirs in the greater Midcontinent USA. Methodologies and workflows reviewed include geosteering and evaluation of horizontal wells and optimizing carbon storage utilization and management.

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