Gas Storage in the Upper Devonian–Lower Mississippian Woodford Shale, Arbuckle Mountains, Oklahoma: How Much of a Role Do Chert Beds Play?
Published:January 01, 2013
Neil S. Fishman, Geoffrey S. Ellis, Adam R. Boehlke, Stanley T. Paxton, Sven O. Egenhoff, 2013. "Gas Storage in the Upper Devonian–Lower Mississippian Woodford Shale, Arbuckle Mountains, Oklahoma: How Much of a Role Do Chert Beds Play?", Critical Assessment of Shale Resource Plays, Jean-Yves Chatellier, Daniel M. Jarvie
Download citation file:
A study of the Upper Devonian-Lower Mississippian Woodford Shale was undertaken on samples at low thermal maturity from the Arbuckle Mountains, southern Oklahoma, to dientify possible mechanisms by which natural gas might be stored in Woodford reservoirs in the adjacent Anadarko Basin. The two main lighologies in the Woodford, chert and mudstone, display different inorganic and organic characteristics. Cherts have (1) variable porosity from 0.59% to 4.90%, (2) low calculated permeabilities, and (3) small mean pore apertures. Intercrystalline pores dominate in cherts. In contrast, mudstones generally have (1) porosities ranging from 1.97% to 6.31%, (2) low calculated permeabilities, and (3) small mean pore apertures. Interparticle, intraparticle, and moldic pores all are present in mudstones. Because of their high quartz content, cherts are brittle and commonly demonstrate microfracturing that is lithologically controlled and bedding perpendicular, whereas much less microfracturing exists in mudstones. The early diagenetic intercrystalline porosity in cherts has likely been preserved since it formed because of the rigid, internal framework provided by the abundant authigenic quartz. Coupled with their relatively high TOC contents, cherts then may be important intervals of gas generation and storage in the Woodford. Where abundant, cherts may then play a significant role as source and reservoir intervals within the formation in the Anadarko Basin.
Figures & Tables
Critical Assessment of Shale Resource Plays
This volume is the product of a joint Hedberg research meeting headed by the AAPG in collaboration with the Society of Petroleum Engineers, and the Society of Exploration Geophysicists. It consists of 10 peer-reviewed chapters covering items from geochemistry, geology, basin analysis, diagenesis, geophysics, geomechanics, and engineering with a main emphasis on shale from North America and Europe. The digital data in the included DVD is a compilation of all extended abstracts submitted for the event or updated since the meeting as well as most presentations and posters in PDF format. Additionally, three videos presented at the meeting have been included. They relate to three-dimensional views of shale pore systems and flume experiements of mudstones bringing a new light on the deposition of fine-grain deposits.