Porosity cut-off values evaluated by classifying reservoir rock types from cores data. A case study for Triassic reservoir T1, Blocks 433a&416b, Algeria

  • Ngo Khanh Xa Petrovietnam Exploration Production Corporation
  • Phung Van Hai Petrovietnam Exploration Production Corporation
  • Nguyen Ngoc Thanh Huy Petrovietnam Exploration Production Corporation
  • Nguyen Hai An Petrovietnam Exploration Production Corporation
  • Le Dinh Thanh Petrovietnam Exploration Production Corporation
  • Pham Duc Bieu Petrovietnam Exploration Production Corporation
  • Do Duy Khoan Petrovietnam Exploration Production Corporation
DOI: https://doi.org/10.47800/PVSI.2023.02-05
Keywords: Porosity, permeability, cut-off, rock type, net pay

Abstract

This paper introduces the method to determine the porosity cut-off values by classifying rock types from cores data based on permeability cut-off value by 1 mD (for sandstone reservoir with oil). The purpose of this method is to calculate net pay reservoir more precisely for estimating hydrocarbons initially in place and building static models. Normally, the cut-off values of porosity are defined on a cross-plot of porosity versus permeability obtained from core data. However, the results of petrophysical analysis are not consistent with DST results. There are some wells with reservoir net pay of several meters, but the DST does not deliver flows. The application of a new method determining the porosity cut-off values on T1 reservoir shows the reservoir net pay is consistent with actual data of the field.

References

Furgo Robertson-Algeria, "Reservoir review, Blocks 433a and 416b, Oued Mya basin, Algeria".

Schlumberger, "Geological and simulation model study report", 2009.

PIDC, "Bir Seba mine development report, Blocks 433a & 416b - Touggourt, Algeria", 2007.

Le Hai An, "Global hydraulic element determination from wireline logs using neural networks for reservoir quality evaluation", Journal of Mining and Earth Sciences, Volume 14, pp. 4 - 8, 2006.

Published
2023-12-25
How to Cite
Ngo, K. X., Phung , V. H., Nguyen, N. T. H., Nguyen, H. A., Le, D. T., Pham, D. B., & Do, D. K. (2023). Porosity cut-off values evaluated by classifying reservoir rock types from cores data. A case study for Triassic reservoir T1, Blocks 433a&416b, Algeria. Petrovietnam Journal, (2), 40-47. https://doi.org/10.47800/PVSI.2023.02-05
Issue
No 2 (2023): Petrovietnam Special Issue - Science, technology & Innovation
Section
Articles

1. The Author assigns all copyright in and to the article (the Work) to the Petrovietnam Journal, including the right to publish, republish, transmit, sell and distribute the Work in whole or in part in electronic and print editions of the Journal, in all media of expression now known or later developed.

2. By this assignment of copyright to the Petrovietnam Journal, reproduction, posting, transmission, distribution or other use of the Work in whole or in part in any medium by the Author requires a full citation to the Journal, suitable in form and content as follows: title of article, authors’ names, journal title, volume, issue, year, copyright owner as specified in the Journal, DOI number. Links to the final article published on the website of the Journal are encouraged.