Fracture characterization and discrimination criteria for karst and tectonic fractures in the Ellenburger Group, West Texas: Implications for reservoir and exploration models

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Description

In the Ellenburger Group fractured dolomite reservoirs of West Texas, it is extremely difficult to distinguish between multiple phases of karst-related fracturing, modifications to the karst system during burial, and overprinting tectonic fractures. From the analyses of drill core, the authors developed criteria to distinguish between karst and tectonic fractures. In addition, they have applied these criteria within the context of a detailed diagenetic cement history that allows them to further refine the fracture genesis and chronology. In these analyses, the authors evaluated the relationships between fracture intensity, morphologic attributes, host lithology, fracture cement, and oil-staining. From this analysis, they ... continued below

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65 p.

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Hoak, T.E.; Sundberg, K.R.; Deyhim, P. & Ortoleva, P. December 31, 1998.

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  • Hoak, T.E. Science Applications International Corp., Germantown, MD (United States)
  • Sundberg, K.R. Phillips Petroleum Co., Bartlesville, OK (United States)
  • Deyhim, P. Oklahoma State Univ., Stillwater, OK (United States)
  • Ortoleva, P. Indiana Univ., Bloomington, IN (United States). Lab. for Computational Geodynamics

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Description

In the Ellenburger Group fractured dolomite reservoirs of West Texas, it is extremely difficult to distinguish between multiple phases of karst-related fracturing, modifications to the karst system during burial, and overprinting tectonic fractures. From the analyses of drill core, the authors developed criteria to distinguish between karst and tectonic fractures. In addition, they have applied these criteria within the context of a detailed diagenetic cement history that allows them to further refine the fracture genesis and chronology. In these analyses, the authors evaluated the relationships between fracture intensity, morphologic attributes, host lithology, fracture cement, and oil-staining. From this analysis, they have been able to characterize variations in Ellenburger tectonic fracture intensity by separating these fractures from karst-related features. In general, the majority of fracturing in the Ellenburger is caused by karst-related fracturing although a considerable percentage is caused by tectonism. These findings underscore the importance of considering the complete geologic evolution of a karst reservoir during exploration and field development programs. The authors have been able to more precisely define the spatial significance of the fracture data sets by use of oriented core from Andector Field. They have also demonstrated the importance of these results for exploration and reservoir development programs in West Texas, and the potential to extrapolate these results around the globe. Given the historic interest in the large hydrocarbon reserves in West Texas carbonate reservoirs, results of this study will have tremendous implications for exploration and production strategies targeting vuggy, fractured carbonate systems not only in West Texas, but throughout the globe.

Physical Description

65 p.

Notes

OSTI as DE99001625

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  • Other Information: PBD: [1998]

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  • Other: DE99001625
  • Report No.: DOE/PC/91008--23-Pt.6
  • Grant Number: AC22-94PC91008
  • DOI: 10.2172/307856 | External Link
  • Office of Scientific & Technical Information Report Number: 307856
  • Archival Resource Key: ark:/67531/metadc679423

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 2, 2016, 2:42 p.m.

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Hoak, T.E.; Sundberg, K.R.; Deyhim, P. & Ortoleva, P. Fracture characterization and discrimination criteria for karst and tectonic fractures in the Ellenburger Group, West Texas: Implications for reservoir and exploration models, report, December 31, 1998; Germantown, Maryland. (digital.library.unt.edu/ark:/67531/metadc679423/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.