Evaluating the impact of a late-burial corrosion model on reservoir permeability and performance in a mature carbonate field using near-wellbore upscaling

Viswa Santhi shanti Chandra, Paul Wright, Andrew Barnett, Richard Steele, Paul Milroy, Patrick William Michael Corbett, Sebastian Geiger, Alessandro Mangione

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Abstract

Field X comprises a giant Palaeogene limestone reservoir with a long production history. An original geomodel used for history matching employed a permeability transform derived directly from core data. However, the resulting permeability model required major modifications, such as horizontal and vertical permeability multipliers, in order to match the historic data. The rationale behind these multipliers is not well understood and not based on geological constraints. Our study employs an integrated near-wellbore upscaling workflow to identify and evaluate the geological heterogeneities that enhanced reservoir permeability. Key among these heterogeneities are mechanically weak zones of solution-enhanced porosity, leached stylolites and associated tension-gashes, which were developed during late-stage diagenetic corrosion. The results of this investigation confirmed the key role of diagenetic corrosion in enhancing the permeability of the reservoir. Insights gained from the available production history, in conjunction with petrophysical data analysis, substantiated the characterization of this solution-enhanced permeability. This study provided valuable insights into the means by which a satisfactory field-level history match for a giant carbonate reservoir can be achieved. Instead of applying artificial permeability multipliers that do not necessarily capture the impacts of geological heterogeneities, our method incorporates representations of fine-scale heterogeneities. Improving the characterization of permeability distribution in the field provided an updated and geologically consistent permeability model that could contribute to the ongoing development plans to maximize incremental oil recovery.
Original languageEnglish
Title of host publicationFundamental Controls on Fluid Flow in Carbonates
Subtitle of host publicationCurrent Workflows to Emerging Technologies
EditorsSusan Agar, Sebastian Geiger
Place of PublicationLondon
PublisherGeological Society of London
Pages427-445
Number of pages19
Volume406
ISBN (Print)9781862396593
DOIs
Publication statusPublished - 2015

Publication series

NameGeological Society special publication
PublisherGeological Society of London
Volume406
ISSN (Print)0305-8719
ISSN (Electronic)2041-4927

ASJC Scopus subject areas

  • Ocean Engineering
  • Water Science and Technology
  • Geology

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    Chandra, V. S. S., Wright, P., Barnett, A., Steele, R., Milroy, P., Corbett, P. W. M., Geiger, S., & Mangione, A. (2015). Evaluating the impact of a late-burial corrosion model on reservoir permeability and performance in a mature carbonate field using near-wellbore upscaling. In S. Agar, & S. Geiger (Eds.), Fundamental Controls on Fluid Flow in Carbonates: Current Workflows to Emerging Technologies (Vol. 406, pp. 427-445). (Geological Society special publication; Vol. 406). Geological Society of London. https://doi.org/10.1144/SP406.11