Application of triple porosity using of image logs and well logs in zonation in one of the oil wells in the southwest of Iran

Authors

Abstract

Asmari-Jahrom reservoirs are one of the main fractured reservoirs in the southwest of Iran and the world (Nelson, 2001). It is very important to study the role of these fractures in increasing the permeability and movement of hydrocarbons along these reservoirs (Alavi, 2004, 2007; McQuillan, 1986). In this study, petrophysical logs (NPHI, RHOB, DT, GR) and image logs (FMI) in GEOLOG 7.0 and CIFLOG software were investigated. Finally, by calculating the amount of fracture and vuggy porosity and correlating them with velocity deviation log (VDL) and fracture parameters (VAH, VDC), it was shown that the amount of fracture porosity is directly related to fracture aperture (VAH) and where the velocity deviation log is negative and low, fracture parameters especially the VAH diagrams show the high peaks. Also, the predominant type of porosity in the reservoir based on the velocity deviation log is the matrix (primary) porosity, which at some distances, fracture porosity and vuggy can be seen in the reservoir. Finally, based on indirect evidence (drilling mud wastage), type of the porosity (matrix, fracture and vuggy), the amount of porosity and the quality of oil saturation in the well, 18 zones were identified, which to determine the quality zone (s) with appropriate reservoir quality. In Asmari Formation of the studied well, in the depth range of 2225 to 2250, the highest fracture density is observed, based on which Zone No. 4 can be introduced as the region with the highest relative permeability for this formation. Also, the highest fracture density in Jahrom Formation is between 2475 to 2569 depth range, which can be said that Zone No. 16 has provided the highest permeability in the Jahrom Formation.

Keywords

References

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Applied Sedimentology
Volume 9, Issue 18 - Serial Number 18
December 2022
Pages 164-185

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History

  • Receive Date: 03 April 2021
  • Revise Date: 28 May 2021
  • Accept Date: 07 July 2021

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